Chelsea
Architects and Interior Designers in Chelsea
Chelsea's houses ask a lot of the people who work on them. A Georgian terrace on Cheyne Walk (SW3), a stucco villa off the King's Road (SW10) and a mews house behind Sloane Square (SW1W) each carry history, planning constraints and close neighbours that shape what is possible before a single drawing is made.
Doll & Co. is a RIBA Chartered Practice. Our architects and interior designers in Chelsea work together from day one, so your planning strategy, structure and finished interior are resolved as one scheme rather than three separate ones.
Architectural Services in Chelsea
Our architectural services in Chelsea cover the full journey: feasibility, pre-application advice with the Royal Borough of Kensington and Chelsea (RBKC), planning, building regulations and construction oversight.
See our full Architectural Services page for how this process runs from feasibility through to completion.
Mansard and Loft Conversions in Chelsea
Mansards are part of Chelsea's roofscape, but RBKC judges each one against the established roofline of its terrace. Where neighbours already have mansards, a well-detailed addition is often supportable. Where the roofline is unbroken, the case needs careful making, and we will tell you honestly before you commit to design fees.
Basement Extensions in Chelsea
RBKC has one of London's strictest basement policies, generally limiting new basements to a single storey beneath no more than half the garden, with a construction management plan required. We design within these limits and coordinate structural engineers, party wall surveyors and site logistics on streets where parking suspensions and skip licences are tightly controlled.
Rear and Side Return Extensions in Chelsea
Many terraces between the Fulham Road and the King's Road, across SW3 and SW10, have narrow back additions that leave the ground floor dark. A side return infill or rear extension with a glazed roof can transform the plan, though Article 4 Directions mean most need a full planning application here.
Listed Buildings and Period Refurbishment in Chelsea
Chelsea has a high concentration of listed buildings, particularly along Cheyne Walk and around the Royal Hospital. Listed building consent covers internal works as well as external, so we prepare heritage statements and detail every intervention to protect original plasterwork, joinery and plan form while adapting these houses for modern family life.
Interior Design Services in Chelsea
Our interior design services in Chelsea run alongside the architecture, not after it. Beam positions, ceiling heights and service routes are fixed with the joinery, lighting and furniture layout already known, which avoids costly late changes on site.
Typical work includes bespoke joinery for awkward period proportions, concealed climate control that keeps cornices and ceiling roses clear, kitchens that open onto rear gardens, and materials chosen to sit comfortably beside original features.
See our full Interior Design page for more on our approach to materials, lighting and bespoke joinery.
How a Project Works, From Enquiry to Completion
Initial conversation. A no-obligation discussion about your property, your brief, and whether we're the right fit — this doesn't commit you to anything further.
Feasibility and survey. We assess what the property and its planning context can realistically support before any design fees are committed.
Design proposal. Concept drawings, and where interiors are part of the brief, an initial material and layout direction.
Planning and technical drawings. The planning application itself, alongside building regulations drawings and a tender-ready information pack.
Construction oversight. Site visits and contract administration through to completion.
You can appoint us for architecture, interior design, or both together — many Chelsea clients choose both, given how closely the two disciplines interact on a renovation.
Planning Permission in Chelsea's Conservation Areas
Much of Chelsea lies within conservation areas, including Cheyne, Royal Hospital, Sloane Square and Chelsea Park/Carlyle. Combined with Article 4 Directions, this means permitted development rights that help homeowners in outer London rarely apply here.
RBKC planning officers expect high design quality and a clear understanding of each street's character. We recommend pre-application advice for most schemes and build the party wall process, typically 8 to 12 weeks, into the programme from the start. Homes near the river, around Chelsea Embankment and Lots Road, may also need a flood risk assessment, which affects basement design in particular.
Nearby Areas We Also Serve
Our experience across the Royal Borough means we understand how planning expectations shift from one conservation area to the next. Alongside Chelsea, we design for homeowners in:
Why Chelsea Homeowners Choose Our Architects and Interior Designers
RIBA Chartered. Our professional duty is to you, not to a contractor's margin.
One team. Architects and interior designers work on your project from the first sketch.
Senior oversight. Technical Director Nick Smith brings over 16 years of high-end residential experience to every project, reviewing detail proposals from conception through to execution.
Borough experience. We work across RBKC, Westminster, Islington, Camden and the City of London, and understand what each planning authority expects.
Honest feasibility. If a mansard, basement or extension is unlikely to succeed, we tell you before design work begins.
Recent Work in Chelsea
Ovington Square This project centres on a two-level basement extension beneath an existing Chelsea house, creating a spa, a cinema room and dedicated wine storage, alongside an internal reconfiguration of the main house above. Projects of this scale on a Chelsea garden square typically involve close coordination with structural engineers and party wall surveyors, given how closely these houses share walls with their neighbours, and a carefully sequenced excavation to keep the build safe and predictable. View the full project.
Clabon Mews View project — still needs a project type and a two-line outcome in your own words; I can't open the link myself to pull those details.
Rated 5 stars on Google, based on verified client reviews. Read our reviews on Google.
Frequently Asked Questions
Do I need planning permission for a loft conversion in Chelsea?
Almost always, yes. Chelsea's conservation areas and Article 4 Directions remove the permitted development rights available in less restricted parts of London, so most loft conversions, including mansards, require a full planning application to RBKC regardless of size.
How much does a basement extension cost in Chelsea?
Basement extensions in Chelsea typically sit at the higher end of London costs, reflecting RBKC's strict basement policy, party wall coordination with closely built neighbours, and the site logistics of working on narrow streets with restricted parking and skip access. We would always recommend a property-specific feasibility assessment before budgeting, since costs vary significantly with garden size and existing foundations.
Which conservation areas cover Chelsea?
Chelsea includes several conservation areas, among them Cheyne, Royal Hospital, Sloane Square and Chelsea Park/Carlyle. Each has its own expectations around materials, roofline and street-facing alterations, which is why we recommend pre-application advice before committing to a design approach.
Can I extend a listed building in Chelsea?
Yes, but listed building consent is required in addition to any planning permission, and it covers internal works as well as external ones. Chelsea has a high concentration of listed buildings, particularly along Cheyne Walk and around the Royal Hospital, so we prepare heritage statements early in the design process.
How long does planning permission take in RBKC?
A straightforward householder application in RBKC typically takes 8 to 13 weeks from validation to decision, though schemes affecting a conservation area, a listed building, or requiring pre-application advice usually take longer. We build this into the programme from the outset alongside the party wall process, which runs a further 8 to 12 weeks.
What does it cost to work with an architect and interior designer in Chelsea?
Professional fees for a combined architecture and interior design service typically run 12 to 18% of construction cost, depending on project complexity and scope. We provide a clear fee proposal before any design work begins, so there's no ambiguity about what's included.
Can I book an initial consultation without committing to a full project?
Yes. An initial conversation is free and doesn't commit you to anything further. We'll talk through your property and what you're hoping to achieve, and give you an honest view on whether we're the right fit, before any formal appointment is made.
Can you work on a house while we're still living in it?
Often, yes, though it depends on the scope. A basement dig usually isn't compatible with staying in the house throughout, while a loft conversion or rear extension frequently is. We'll give you an honest assessment of what's realistic for your specific project at feasibility stage.
Can I appoint Doll & Co. for architecture only, or interior design only?
Yes. Many clients use us for both, given how closely the two disciplines interact on a renovation, but we also take architecture-only and interior-design-only appointments where that's what a project needs.
Visit Our Studio
While our work takes us across Chelsea and the wider Royal Borough, our studio is based at 33 Newman Street, London W1T 1PY, with a second studio at Woodseats Studio, Bighton Road, Alresford, Hampshire GU34 5ND. Call us on 020 3870 7262, Monday to Friday, 9am to 6pm.
Speak to Our Chelsea Architects and Interior Designers
Whether you are considering a mansard near Sloane Square, a basement beneath a house in The Vale or a full refurbishment of a listed home on Cheyne Walk, we would be glad to discuss what your property and its planning context allow.
Disclaimer: The information provided on this page is for general guidance purposes only. Every property and project is unique, and specific planning considerations, costs and timelines must be evaluated on an individual basis following a formal project consultation.