We design, plan and build house extensions across Richmond and the wider Richmond upon Thames borough — one team, one fixed price, one project manager from sketch to handover.
Typical scope +18 to +60m²
Cost guide From £2,500 / m²
Build time 12–22 weeks
Consult Free 1–2 hour visit
BUILDING IN RICHMOND
Richmond combines Georgian and Victorian streets near the river with newer developments inland. Multiple conservation areas mean planning needs careful handling.
We extend and refurbish Georgian terraces near the green with carefully matched brickwork and glazed rear extensions. In newer areas we design contemporary additions.
Five Richmond projects include a rear extension on an 18th-century terrace and a two-storey new build in a modern estate.
Local advantage
Why Richmond homeowners choose DPS for house extensions
01 · PLANNING HANDLED
We handle the permission side in-house.
Planning drawings, building-regulations and party-wall paperwork are prepared and submitted by our own team —
including for conservation-area or listed properties where extra consent is needed. One point of contact owns
both the approvals and the build, so nothing falls between an architect and a separate contractor.
02 · ONE TEAM
Architects, builders, project managers — all in-house.
No subcontractor juggling. From the first sketch through structural engineering to final snagging, your project moves
through people who all sit in the same office and answer to the same project manager.
03 · TRANSPARENT PRICING
From £2,500 / m² — itemised and fixed.
You pay in stages, only after each stage is signed off. Variations only happen when scope genuinely changes — and
they go through written authorisation, never a verbal "while we are at it".
Yes — Richmond (TW9) is well within our Richmond upon Thames working area. We typically deliver several house extensions projects across this borough each year.
How long does a house extensions project take in Richmond?
End-to-end (consultation → handover) usually 12–22 weeks. Build phase alone is shorter — most house extensions sites complete in 8–18 weeks depending on scope and finishes.
What does house extensions cost in Richmond?
Typical range: From £2,500 / m². Our online calculator gives you a tighter figure based on your house type and ambitions; the fixed quote follows a free site visit.
Will I need planning permission in Richmond?
It depends on the property. Many house extensions fall under permitted development, especially in Richmond upon Thames. Where planning is needed (conservation areas, listed properties, larger schemes), we handle the application end-to-end.
Do I need planning permission for a house extension?
Many extensions fall under permitted development. We assess your property and tell you exactly what you need on the first visit.
How long does a typical extension take?
A single-storey extension takes 12–16 weeks from breaking ground to completion. Double-storey runs 16–22 weeks.
Can we live in the house during the build?
For most rear extensions, yes. We dust-seal the working area and maintain access to your kitchen and bathroom.