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Regent’s Park Grade I Listed Renovation

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High-End Internal Fit Out by Harris Calnan

The team here at Harris Calnan have successfully completed a high-end renovation of a Grade I listed property in Regent’s Park, delivering a full internal fit out with exceptional attention to detail throughout.

Working within one of London’s most prestigious and historically significant locations, this project required a careful balance between preserving original character and introducing a refined, modern finish suitable for contemporary living.

A Complete Internal Transformation in Regent’s Park

This project involved a full internal fit out across the entire property, reconfiguring and upgrading the interior to meet the highest standards.

Every space has been thoughtfully executed to enhance both functionality and flow. From the initial strip out through to final finishes, the focus remained on quality, precision, and consistency.

The result is a home that feels cohesive throughout, with each room complementing the next while maintaining its own identity.

Working Within a Grade I Listed Property

Carrying out works within a Grade I listed building presents a unique set of challenges. Every decision must respect the architectural significance of the property.

Our team worked closely with the appointed architects, Flower Michelin Architects, to ensure all elements aligned with heritage requirements while still achieving a high-end finish. This approach allowed us to retain key period features such as original cornicing, fireplaces and proportions, while upgrading the property to modern standards behind the scenes. The interiors showcase a consistent level of craftsmanship across every space.

Key features include:

  • Bespoke joinery integrated seamlessly into living areas and bedrooms
  • Natural stone surfaces across bathrooms and kitchen spaces
  • Carefully selected lighting to enhance both mood and functionality
  • A neutral material palette that allows textures and detailing to stand out

The bathrooms feature freestanding baths, marble finishes and clean detailing, creating calm and refined spaces. Living areas combine darker tones with softer furnishings, adding depth and contrast while maintaining a cohesive overall feel.

While the property retains its historic character, the layout and finishes have been tailored for modern day use. Open, connected living spaces improve usability, while bespoke storage solutions maximise practicality without compromising on design. Natural light plays a key role throughout the property, with large windows and considered layouts helping to create bright, welcoming interiors.

Collaborative Approach to Delivery

This project was delivered in collaboration with Flower Michelin Architects & White & Lloyd. Working closely with both teams ensured a smooth process from concept through to completion. Clear communication and coordination allowed every detail to be executed to the highest standard.

Looking to Start a High-End Renovation Project?

If you are planning a high-end renovation or listed property refurbishment in London, Harris Calnan can support you from concept through to completion.

Explore our full range of services or get in touch with the team to discuss your project.

Gallery:

Hosting Architecture for London at our St John’s Wood project

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A key milestone marked with a full team site walkthrough as the structure begins to emerge

Our team was pleased to host the team from Architecture for London at our ongoing site in St John’s Wood. The team joined us for a detailed walkthrough of the project’s progress. With everyone arriving bright and early, it was a great opportunity to bring together the wider project team. Together, we were able to share a closer look at the work completed to date.

The visit came at a significant stage in the build, with the basement now fully excavated following several months of complex groundworks. Delivered in collaboration with Malci and Quorum Consulting Engineers, this phase has been a major part of the programme, and seeing the scale of the excavation in person really emphasised the level of coordination and precision involved.

With the structural design by Richard Tant Associates now beginning to take shape on site, the early form of the new home is becoming visible. Walking the team through this stage alongside our clients created a real sense of momentum, marking a turning point in the project as it transitions from groundworks into the build phase. It felt like a milestone moment, similar to a topping out, just experienced in reverse.

Architecture For London On Site:

Moments like this highlight the importance of collaboration across the full project team. Bringing architects, engineers, contractors and clients together on site not only reinforces the shared vision for the project, but also provides a valuable opportunity to reflect on progress and align on the next stages.

With the sun out and strong progress being made, it was a great reminder of why the work behind the scenes matters. We look forward to continuing to share updates as this exciting project develops further.

To see more of our work, visit our projects page and stay tuned for further updates as this build continues to progress.

Celebrating Conservation Craftsmanship in Tottenham’s Heritage Restoration

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As work at our Grade II* listed Tottenham project nears completion, it feels like the right moment to pause and recognise what has been achieved from a conservation perspective.

This project has always been about more than transformation. From the outset, the priority was to respect the building’s historic character while carrying out the careful restoration required to secure its future. Every stage has demanded patience, traditional skills and a deep understanding of heritage construction, with decisions guided by the fabric of the building itself.

Throughout the works, we have carefully uncovered original features and protected and retained these wherever possible. We have also treated the historic masonry, aged timber elements and period detailing with great sensitivity. In many cases, this meant adapting modern construction methods to suit historic materials rather than forcing the structure to conform to contemporary standards.

The success of this approach has relied heavily on collaboration. Working closely with conservation advisors, skilled subcontractors and specialist trades, the Harris Calnan team has taken a joined-up view of the project, ensuring that craftsmanship and conservation principles remained central to every decision on site. This collective commitment has been key to preserving the integrity of the building while delivering a robust and lasting restoration.

A Shared Commitment to Conservation

Conservation architect Nathan Goss recently visited the site as the project approached its final stages, noting the care taken throughout the works and the strength of the team involved. Feedback like this reflects the ethos that has underpinned the project from day one, namely that heritage buildings deserve time, skill and respect.

As the Tottenham restoration reaches completion, it stands as a testament to what can be achieved when traditional craftsmanship is combined with a collaborative, conservation-led approach. We are proud to have played a role in safeguarding this historic building and ensuring its character endures for generations to come.

We’re looking forward to sharing the final images from the project once everything is complete, capturing both the restored building as a whole and the finer historic details that make it so special. If you’d like to learn more about this project and others like it, you can explore our work in more detail by clicking here. Below, please see a selection of images highlighting some of the historic features that we have carefully preserved throughout the restoration.

Ealing Residential Redevelopment – Project Progress Update

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Basement and Roof Milestones Mark Major Progress on this Complex Ealing Redevelopment

Works are continuing at pace on our major residential redevelopment project in Ealing, with significant milestones now reached both above and below ground.

This carefully planned scheme involves the full strip-out of the existing house and the construction of a new basement beneath the original footprint. Additionally, we will complete a rear extension, extensive structural alterations and a complete high-end internal fit out. Alongside the architectural transformation, the project has been designed with a strong focus on low-carbon performance and long-term energy efficiency.

Basement Structure Nearing Completion

One of the most complex phases of the build is now approaching completion, with the new basement structure largely formed beneath the existing property. We have carried out extensive structural works to safely create the additional level, providing valuable new living space while maintaining the integrity of the original house above.

A standout feature at this stage is the bespoke staircase which now links the basement seamlessly to the rest of the home. Designed as both a functional and architectural element, the staircase integrates seamlessly into the structure and plays a key role in how the new spaces connect and flow once the project is complete.

New Roof Structure In Place

Above ground, the project has reached another major milestone with the new roof structure now installed. The framing is complete and clearly defines the updated form of the house, marking a visible step forward in the transformation of the property.

With the roof structure in place, the building is beginning to take its final shape, allowing the project to move confidently into the next stages of construction and internal works.

With the roof structure now established, the building envelope is beginning to close in, providing a clear platform for the next phases of the programme. This stage allows greater coordination of follow-on trades and supports the smooth transition into weatherproofing, services installation and internal fit out as the project continues to progress.

Sustainable Systems and High-End Finish

Sustainability is a core part of this redevelopment. The house will benefit from a ground source heat pump and a low-carbon, high-efficiency design approach throughout. This will support long-term energy performance without compromising on comfort or quality.

As the structural phases conclude, focus will continue to shift towards the high-end fit out, where detailing, materials and craftsmanship will define the finished home.

Collaborative Delivery

This project is being delivered in collaboration with Beasley Dickson Architects, whose considered design has guided the transformation of the property. Additionally, Foster Structures have supported the complex structural requirements of both the basement and superstructure works.

To see more of our recently completed projects with a similar scope, please click here.

Building Below Ground: The Complexity of Basement Construction

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Why Basement Construction Requires Specialist Experience

Basement construction has become an increasingly popular way to create additional space within high-value residential properties, particularly across London and the surrounding areas. Whether forming part of a new build or a complex conversion beneath an existing home, basements offer valuable accommodation without compromising the external footprint of a property.

However, basement construction is one of the most technically demanding aspects of residential building. It requires specialist knowledge, careful planning and an experienced contractor capable of managing risk at every stage.

Basement Construction is not Standard Groundworks

Unlike typical groundworks, basement excavation involves working at significant depth, often within restricted urban sites and in close proximity to neighbouring properties. Ground conditions can vary considerably and the risks associated with excavation increase rapidly the deeper a project goes.

Managing ground stability, sequencing works correctly and implementing appropriate temporary support systems are all critical. Any error at this stage can have serious implications for surrounding structures, which is why basement construction demands a contractor with proven experience in deep excavations and complex below-ground works.

Structural Complexity Below Ground

Basements frequently involve major structural interventions. These can include underpinning existing foundations, installing extensive steelwork and carefully transferring loads to allow the structure above to remain stable throughout construction.

In refurbishment and conversion projects, this work is often carried out beneath occupied homes or alongside neighbouring properties. This requires meticulous coordination with structural engineers and a detailed understanding of how existing buildings behave when altered. Precision and experience are essential to ensure safety, compliance and long-term structural integrity.

Waterproofing and Long-term Performance

One of the most critical elements of basement construction is waterproofing. A basement is only as successful as its ability to remain dry and perform well over time.

Effective waterproofing systems must be correctly designed, installed and integrated with the overall structure. This often involves multiple layers of protection and close coordination between designers, engineers and specialist contractors. Poor decisions or shortcuts at this stage may not become apparent for years, by which time rectifying issues can be highly disruptive and costly.

A specialist contractor understands the importance of getting waterproofing right first time and takes a long-term view of performance rather than focusing solely on short-term build considerations.

Logistics and Site Management Challenges

Basement construction brings unique logistical challenges, particularly in urban locations. Restricted access, limited working space and the need to remove large volumes of excavated material all require careful planning.

Noise, vibration and safety considerations must be managed sensitively, especially when working close to neighbouring properties or within conservation areas. A well-managed site, clear communication and experienced supervision play a key role in minimising disruption and maintaining good relationships with surrounding stakeholders.

Coordination with the Wider Project

Basements rarely exist in isolation. They are typically integrated into wider new build or refurbishment schemes, requiring seamless coordination with the rest of the construction programme.

Services, drainage, plant rooms and structural elements all need to align with the above-ground design. Early contractor involvement and close collaboration with architects and engineers helps to ensure that basement spaces function effectively and complement the overall scheme rather than creating constraints later in the build.

Why Experience Makes the Difference

Basement construction carries a higher level of risk than most residential building work. It demands technical expertise, disciplined site management and the ability to anticipate and mitigate challenges before they arise.

An experienced contractor brings not only practical knowledge but also the confidence to manage complex conditions, make informed decisions and deliver a basement that integrates seamlessly into the finished property. This experience is particularly valuable on high-end residential projects where quality, longevity and performance are paramount.

At Harris Calnan, basement construction forms a core part of our work. Our experience across complex new builds and conversions allows us to deliver technically demanding basement projects with care, precision and confidence, ensuring robust, high-quality results that stand the test of time.

Harris Calnan: A Year in Review

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Reflecting on a Year of Progress

As the year draws to a close, we reflect on a period defined by progress, collaboration and the delivery of highly considered construction projects across London with this year in review.

Throughout the year, Harris Calnan has continued to work on complex, design-led schemes, combining technical expertise with a measured and professional approach. From substantial basement developments to sensitive heritage restorations, each project has been guided by precision, care and close collaboration with our clients and professional teams.

Completed Projects:

Take a short look back on a few of the projects we completed over the course of 2025:

St Albans – New Build Residence

This year saw the completion of a striking contemporary new build in St Albans, delivered following the full demolition of the existing property. A defining feature of the scheme was the large basement, an area where Harris Calnan’s extensive experience in complex excavation, waterproofing and structural coordination came to the fore. From groundworks through to final completion, the project was delivered with care and confidence, resulting in a modern home of exceptional quality.

St John’s Wood – Luxury Renovation

A landmark luxury renovation and basement conversion, Carlton Hill involved retaining the original façade while rebuilding the structure behind and introducing a newly constructed basement. Delivered in close collaboration with M W Architects and a highly skilled consultant and contractor team, the project balances architectural heritage with contemporary living. The result is a refined and elegant home, finished with uncompromising attention to detail throughout.

Marylebone – Grade I Listed Refurbishment

This Grade I Listed renovation was completed with absolute precision and sensitivity. Working alongside specialist heritage consultants and architects, the project carefully respected the building’s historic fabric while introducing subtle modern refinements. The finished home feels timeless, understated and beautifully resolved.

Current Projects:

Harris Calnan is currently progressing a strong portfolio of live projects across London, each reflecting the practice’s expertise in complex, design-led construction.

In Islington, works continue at Highbury Hill where a high-end renovation and basement extension is taking shape, combining careful structural intervention with specialist waterproofing and a refined restoration of the original façade.

In Ealing, a full residential transformation is underway, incorporating a new basement, rear extension and roof works, alongside a strong focus on sustainable, low-carbon design to deliver a contemporary and energy-efficient family home.

Heritage Restoration Tottenham

Further activity continues in St John’s Wood, where an early-stage renovation is now established with extensive temporary works in place to enable a lowered and extended basement, setting the foundations for a high-quality refurbishment to follow.

Alongside these residential schemes, Harris Calnan is also delivering the sensitive heritage restoration of the Grade II* listed buildings on Tottenham High Road, working closely with conservation specialists and architects to preserve historic fabric while carefully introducing new basement spaces and future commercial uses.

Together, these projects demonstrate a balance of technical expertise, collaborative working and a considered approach to both contemporary and historic environments.

Looking Ahead

As we move into the year ahead, we do so with a strong pipeline of projects on site and a continued focus on quality, collaboration and thoughtful construction. We look forward to progressing our current schemes and delivering future projects with the same level of care and professionalism that defines Harris Calnan’s work.

We would like to thank our clients and professional teams for their continued trust and collaboration throughout the year.

To see more of our work from the past year, please check out our other news stories by clicking here.

Why Choosing the Right Principal Contractor Defines Your Renovation Outcome

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When you invest in a high end renovation you are not just choosing new materials or layouts, you are choosing the team who will bring your vision to life. The quality of your principal contractor defines how smoothly your build runs, how well the design is protected and how exceptional the final finish will be.

Understanding the Role of the Principal Contractor

A principal contractor is the central link between the design stage and the physical build. Their responsibility is to keep every moving part aligned so the project progresses with confidence and clarity. For homeowners this often means far more than people realise.

A strong principal contractor will:

  • Coordinate architects, designers, engineers and specialist trades
  • Manage timelines and budgets with accuracy and transparency
  • Oversee quality control at every phase of the build
  • Maintain safety, compliance and clear communication
  • Protect the design intent so the final home reflects the vision agreed at the outset
  • Anticipate challenges before they disrupt progress

For more information about a principal contractor’s responsibilities, click here.

How Harris Calnan Safeguard Quality

Every renovation carries its own challenges. At Harris Calnan we take pride in delivering work that balances architectural ambition with technical precision.

Our long-standing relationships with skilled subcontractors ensure consistency from the first day on site to the final handover. Our team understand the importance of detail whether that is structural accuracy, specialist materials or bespoke elements crafted to fit the design perfectly.

We keep clients informed through every stage of a project and work closely with architects and designers so the vision remains intact throughout the build.

For information about how we work, click here.

Examples of Coordinated Craftsmanship

Many of the projects we deliver involve complex reconfigurations, heritage structures and high performance building systems. In recent renovations we have managed everything from full structural changes to complete interior rebuilds where bespoke joinery, mechanical systems and refined finishes had to work together seamlessly.

Our role as principal contractor is to ensure that every contributor to the project is aligned and that the quality remains consistent from groundwork to decoration.

Advice for homeowners choosing a principal contractor

Selecting the right principal contractor can feel daunting but there are simple steps that help you make an informed choice.

You should consider:

  • How transparent the contractor is with programme and budget
  • Whether they can demonstrate quality through past work
  • How they communicate changes or technical issues
  • Their experience with the level of finish you expect
  • How early they recommend being involved in the design process

Early contractor involvement can resolve technical challenges before construction begins which improves efficiency and supports the intended design outcome.

Building Your Home With Confidence

A high end renovation demands a principal contractor who brings skill, care and coordination to every stage of the build. At Harris Calnan we combine technical expertise with a commitment to craftsmanship so each project is delivered to the standard clients expect.

If you are planning a renovation and would like to discuss how our team can support your vision we would be pleased to hear from you.

Highlever House: Modern Craftsmanship for a Calming Contemporary Home

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A Landmark New Build: Highlever House by Harris Calnan

Harris Calnan is proud to have delivered Highlever House, a striking contemporary new build crafted in close collaboration with architects Powell Tuck Associates. This remarkable home combines high end finishes with thoughtful detailing, resulting in a space that feels both sculptural and deeply comfortable.

From the moment you step inside, the property sets out to surprise. A destination view pulls your eye through the length of the house towards the garden, creating an immediate sense of openness. The upside down design makes this expansive feel possible. The layout places all bedrooms at basement level, which might seem unconventional at first, yet the generous ceiling heights and carefully positioned light wells allow daylight to flood deep into the plan so the space works seamlessly.

Across the home, material quality and long term durability were central to the brief. Reclaimed brick and weathered timber allow the building to develop character over time, while precision crafted internal finishes celebrate clean lines, natural textures and calm tonal palettes.

Large format glazing frames the garden which has been planted to ensure every sightline feels unique. When viewed from the main living areas, the landscape sits just above table height which helps the garden read almost as an extension of the interior

One of the standout features of Highlever House is its central staircase which appears to float in place. Built with minimal connections to the surrounding walls, it demonstrates the balance of structural finesse and skilled craftsmanship that defines the entire build.

Harris Calnan’s team managed the complex requirements of the project with meticulous attention to detail, ensuring every element from concrete finishes to bespoke joinery met the exacting standards set by the architects. The result is a home that feels serene yet robust, refined yet warm, and designed to be enjoyed for many years to come.

To check out more of our projects, including a look at this project in more detail, please click here.

Project Walkthrough: St John’s Wood, Low Carbon Renovation

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We are pleased to share a video walkthrough of the early stages of our latest St John’s Wood renovation, delivered in collaboration with Architecture for London. Click on the video to learn more about this fantastic project.

The walkthrough shows the substantial temporary works now in place. We’ve installed steels and supports to extend the ground floor and secure the structure. This careful preparation allows excavation of the new basement to begin safely and efficiently.

This renovation will transform the existing house with a full strip out, a lowered and extended basement, and a high end fit out. Every stage of the build is guided by a low carbon, high efficiency approach, ensuring the finished home will be both elegant and sustainable.

Although the project is still at an early stage, the walkthrough highlights the scale of the work involved and the precision required. It offers an inside look at how complex residential projects are carefully managed from the very start.

We will continue to share updates as the project develops, giving further insight into each stage of this St John’s Wood renovation.

To see some of our finished finished projects, click here.

foundation works for substantial basement structure
work in progress

New Build with Expansive Basement in St Albans

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Harris Calnan recently delivered a striking new build residence in St Albans, following the full demolition of the existing property. The scheme involved the construction of a contemporary home complete with a large basement. This basement quickly became the defining feature of the project.

We usually focus on substantial developments across North London so the scale of the basement excavation made this project a perfect match for our expertise. Over the years, Harris Calnan has developed a strong record in complex basement works. Our experience covers deep excavations, specialist waterproofing and the careful coordination of services within tight structural constraints.

These skills allowed us to manage every stage with confidence and ensure the basement integrated seamlessly into the overall design of the home.

From groundworks through to completion, our team oversaw each element with care and precision. The result is a modern residence built to the highest standard, combining contemporary architecture with robust construction that will stand the test of time.

We worked alongside Neil Choudhury Architects on this project and collaborated with a skilled group of contractors and suppliers who contributed their craftsmanship and expertise.

If you would like to discuss an upcoming project with us, please get in touch.

Contact us
📞 020 8968 8877
📧 [email protected]

To see more of our projects please click here.