Architects, Engineers, Surveyors & Builders Under One Roof.
One Studio. One Contract. One Team.
RICS surveying support for party walls, licence to alter, conservation-area works & neighbour mattersWe design and build Richmond house extensions across Richmond's principal residential streets - side-return, rear, wraparound and double-storey additions for Georgian Riverside houses, Victorian terraces and larger family homes where planning strategy, conservation detailing, Party Wall sequencing and structural engineering need handling properly.
Every house extension project in Richmond is designed to respect the Richmond Hill Conservation Area and the character of Georgian riverside houses, Victorian terraces, park-facing mansion flats. Our in-house RIBA Chartered Architects handle Richmond upon Thames planning applications, our chartered structural engineers specify any load-bearing work, and our directly-employed trades deliver the build under one fixed-price contract. We coordinate Building Control, Party Wall awards where needed, and all certifications through to handover.
Richmond falls within a conservation area, which means visible external alterations require careful design and often full planning permission. Our architects have extensive experience securing approvals in Richmond's conservation areas.
Our house extension projects in Richmond are delivered by our in-house team of RIBA architects, structural engineers and specialist tradespeople. Every project is managed under a single fixed-price contract with no hidden costs.
Richmond is one of London's great historic towns, and extending here is heritage work of a high order. The town belongs to Richmond upon Thames, with conservation areas including Richmond Hill and the Green protecting one of the finest townscapes in London, a dense cluster of listed Georgian houses and protected river views. Four conservation areas — Richmond Green, Richmond Riverside, Richmond Hill and Central Richmond — each carry a published statement.
The protected view is the defining constraint. The celebrated outlook from Richmond Hill is safeguarded by the Richmond, Ham and Petersham Open Spaces Act 1902, so roof forms and upper storeys are assessed for visibility and townscape as well as design. Many Georgian houses are listed, which means interiors are reconfigured and re-serviced with consent at each step, and riverside properties need flood resilience built in.
The build follows that care: terrace structure, party-wall coordination, facade and sash repair, listed limits and access around the historic streets. A Richmond rear extension is estimated at £71,250 to £112,500 before VAT, a side return in the £90,000 to £120,000 region.
Richmond sits in the London Borough of Richmond upon Thames, with conservation areas including Richmond Hill and the Green protecting one of the finest townscapes in London — with a high concentration of listed Georgian houses and protected river views. Richmond town and its riverside are covered by four conservation areas, each with a published conservation area statement: Richmond Green (No. 3), Richmond Riverside (No. 4), Richmond Hill (No. 5) and Central Richmond (No. 17). The Richmond Hill Conservation Area was designated on 14 January 1969 and extended in 1975, 1977 and 2000; the celebrated view from Richmond Hill is protected by the Richmond, Ham and Petersham Open Spaces Act 1902.
Sources: Richmond upon Thames Council - Conservation area statements (+ Richmond Hill CA appraisal) (2026); Richmond upon Thames Council - Conservation area statements (2026); Richmond upon Thames Council - Richmond Hill Conservation Area Appraisal (2026)
An extension reshapes how the whole ground floor works, not just how big it is — the new structure, the opening into the existing house, the kitchen and the garden connection all have to be designed as one move. We take each project from feasibility drawings through consents, structure and fit-out under a single fixed-price contract. Most extensions we build include the scope below.
Six stages, with the consents and engineering settled before the first spade goes in.
Read the full house extension guide for extension types, permitted development limits and the build programme stage by stage.
Many rear extensions can proceed under permitted development — broadly up to 3m deep on attached houses and 4m on detached, extendable to 6m and 8m through the prior approval scheme — but conservation areas, Article 4 directions and listed status change the picture, and every extension needs Building Regulations approval regardless of the planning route. Where foundations come within 3m of a neighbouring building, the Party Wall etc. Act 1996 obliges you to give adjoining owners a minimum of two months’ written notice before construction can begin. Our planning guide library sets out the rules for each borough.
Extensions go wrong in the gaps between architect, engineer and builder — so we removed the gaps. The scheme is designed by our in-house RIBA Chartered Architects, the steel and foundations are calculated by our own structural engineers, and party wall matters are supported by RICS surveying through our sister company, Hampstead Chartered Surveyors. The build is delivered by teams we use project after project, under a fixed-price JCT contract carrying £10M professional indemnity and public liability cover, a 12-month defects period and a 10-year workmanship warranty. Enquire before 2pm on a weekday and we will call you back the same day.
Because so much of the town is protected. Richmond belongs to Richmond upon Thames, and conservation areas including Richmond Hill and the Green safeguard one of the finest townscapes in London, a dense cluster of listed Georgian houses and protected river views. Listed-building consent applies widely, so many Richmond extensions are heritage projects from day one.
Yes. Four conservation areas cover the town and its riverside — Richmond Green (No. 3), Richmond Riverside (No. 4), Richmond Hill (No. 5) and Central Richmond (No. 17) — and the celebrated outlook from Richmond Hill is safeguarded by the Richmond, Ham and Petersham Open Spaces Act 1902. Roof and upper-storey proposals are tested against that protected vista.
London-wide guidance estimates a Richmond rear extension at £71,250 to £112,500 before VAT. A side return is more, in the £90,000 to £120,000 region, with a wraparound at an indicative £100,000 to £200,000. Where the house is listed, the heritage consent and specification often carry the figure toward the upper end.
A Richmond budget is shaped by terrace structure, party-wall coordination, facade and sash repair, listed or conservation-area limits, access around the historic streets, and the level of interior specification. On the Georgian houses consent is needed at each step, so an addition is sequenced carefully rather than built at pace.
Richmond is one of London's great historic towns: Georgian riverside houses, Victorian terraces and period homes. Richmond Hill carries grand Georgian houses beside the famous protected view over the Thames, Richmond Green and Maids of Honour Row hold exquisite early-Georgian terraces, and Ormond Road adds fine period houses.
Visit our studio or invite us to survey your home. We’ll assess scope, discuss design possibilities and provide an honest budget framework — completely free.
We survey your property, discuss your vision and provide a clear budget framework.