01
One team, end-to-end
Architects, project managers, in-house trades. One contract, one number, one schedule — never multiple sub-contractors finger-pointing.
WHAT WE DO · SERVICES
Three things, done properly. Nothing else
House extensions, loft conversions, new builds. Designed, planned and built by one team — so the budget, schedule and quality stay in your control from the first sketch to handover.
- Services 3 disciplines
- Coverage SW London
- Typical scope 8–60 weeks
- Itemised Fixed price
20+
Years
Established 2007
320+
Projects
Across SW London
£5m
Insured
Public liability
4.9
Rating
183 reviews
01 · Disciplines
Choose the right project for your home
Not every house needs the same thing. We recommend the option that adds the most usable space, light and resale value for your budget — even if that means a smaller scope than you arrived with.
SERVICE 01 House extensions
A house extension is the biggest investment you can make in your home — it should transform how your family lives, not just add square metres. We design every extension around how you actually use your space, with a fixed, itemised price and stage-based payments so you stay in control from first sketch to handover.
- Single-storey extension
- Double-storey extension
- Side-return extension
- Wrap-around extension
SERVICE 02 Loft conversions
A loft conversion adds an entire floor without losing any garden. We design lofts as proper rooms — full-height ceilings, generous windows, en-suite bathrooms — not afterthoughts squeezed into the rafters.
- Dormer
- Mansard
- Hip-to-gable
- L-shape
SERVICE 03 New builds
New build is the most ambitious thing you can do — a chance to design exactly the home you want from the ground up. We have delivered single houses on infill plots, full plot developments, and demolition + rebuild projects. We work with leading architects or your own.
- Family homes
- Replacement dwellings
- Mews
- Sites up to 4 units
02 · Why DPS
Four reasons clients pick us — and recommend us
Roughly a third of our work comes from existing client recommendations. The reason is structural: how we contract, how we pay, how we communicate.
02
Fixed-price, itemised
Quote line by line so you see exactly where the budget goes. No "extras" mid-build — variations only when you change scope and always agreed in writing.
03
Stage-based payments
You only pay for work that has been completed and approved. We don't ask for big upfront deposits — your money tracks our progress.
04
10-year warranty
Every structural project ships with a 10-year insurance-backed warranty (NHBC, Premier or LABC). Plus a 12-month workmanship warranty on finishes.
Get started
Ready to start your project?
Free quote in 2 minutes — no callbacks, no commitment. Or talk to a real human on 0800 0432 333.