High-End Residential · London
Rosace Design Studio works with a small number of clients at any time, bringing the full attention of the practice to every commission - from first sketch to final handover. Architecture, interior design, and construction, under one contract.
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What We Do
Rosace Design Studio is an architecture and construction practice that designs and builds high-end residential projects across London and the surrounding counties. We handle every stage from the first conversation through to the final detail of the interior.
Luxury architecture is not about excess. It is about precision, restraint, and the relentless pursuit of quality at every level of the project. From the proportion of a room to the shadow line where a wall meets a ceiling, every decision matters. We believe the best residential spaces feel calm, considered, and deeply personal to the people who live in them.
As experienced residential architectural designers in London, we work across all project types: house extensions, loft conversions, new build homes, basement conversions, whole-house refurbishments, and interior architecture. What makes our luxury work different is the depth of design development, the quality of detailing, and the level of attention we give to every material, finish, and junction.
Because we are both the architectural designer and the builder, the standard of design we set at the drawing stage carries through to the quality of the finished build. There is no gap between intent and execution. The same team that specified a particular stone for a bathroom floor is the team that installs it.
Our Approach
Quality at this level is not achieved through budget alone. It requires a considered design process, a studio that listens carefully, and a team that understands the difference between getting something built and getting something right. Rosace Design Studio is among a select group of residential architectural designers in London who commit to this standard on every project.
Design Rigour
Every decision - from the overall massing to the profile of a window frame - is considered and resolved. We don't make arbitrary choices, and we explain our reasoning at every stage.
End-to-End Management
Architecture and interior design managed in-house, from concept through to construction. One studio, one point of contact, complete coherence between design and delivery.
Measured Scale
We work with a small number of projects simultaneously. This is a deliberate choice - it means every client receives the direct attention of the studio's senior team, not a junior delegation.
Interior Architecture
The best residential projects treat architecture and interior design as a single discipline. At Rosace, both are designed in-house - meaning the relationship between space, light, material, and detail is resolved coherently from the outset, rather than patched together by separate consultants.
We provide full interior architecture services: space planning, material and finish specification, bespoke joinery design, furniture selection, and FF&E coordination - available as part of any architectural commission or as a standalone service.
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Cost Guide
Fees for high-end residential architecture in London are typically calculated as a percentage of the construction cost, usually between 10 and 15 percent depending on the scope of services. The higher percentage reflects the additional design development, bespoke detailing, specialist coordination, and interior architecture that high-end projects require.
For a luxury house extension with a construction cost of £150,000, architectural fees would typically be between £15,000 and £22,500. For a high-end new build costing £1 million to construct, fees might range from £100,000 to £150,000, reflecting the extensive design work, consultant coordination, and interior specification involved.
Construction costs for luxury residential projects in London typically range from £3,000 to £5,000 per square metre or more, depending on specification. Premium finishes, bespoke joinery, underfloor heating, smart home systems, high-performance glazing, and stone cladding all push costs towards the upper end.
Because Rosace Design Studio handles both design and construction, our combined fees are often more competitive than appointing a luxury architectural designer and a high-end builder separately. We provide a clear, detailed fee proposal before any work begins.
Design & Build
In luxury residential work, the gap between design and construction is where quality is most often lost. An architectural designer specifies a particular stone, a particular finish, a particular detail. The builder substitutes something cheaper, or installs it differently, and the result falls short of the design intent.
Rosace Design Studio eliminates that risk. We are both the design studio and the builder. Our design team specifies every material and detail, and our construction team installs them exactly as intended. There is no handover between firms, no reinterpretation of the design, and no compromise on quality.
This model is particularly important for luxury projects where the detailing is more demanding and the tolerance for error is lower. A bespoke kitchen island, a shadow gap junction, a flush door threshold - these details require the design team and the build team to work in close coordination, which is exactly what happens when they are the same practice.
We work across all of Greater London and within a 30-mile radius, with particular experience in Kensington, Chelsea, Mayfair, Notting Hill, Hampstead, Belgravia, Richmond, and Surrey.
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Tell us the size, location and finish level. Our calculator returns a realistic range for your extension or loft conversion, with a detailed breakdown available.
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