Garden Rooms in London
A garden room is a proper room — SIPs or PIR-insulated, mains-powered, heated, and finished to the same standard as the main house. Home offices, gyms, studios, treatment rooms and guest snugs, engineered to be used every day of the year rather than a summer shed at the end of the lawn.
Garden Rooms designed around compact rear gardens, party-wall etiquette and permit-parking logistics.
From Chelsea townhouses to Hampstead villas and Ruislip family homes, we install across every London borough — inside the M25 and out. Our surveyors know the quirks of Victorian sashes, Edwardian bays and post-war casements.
Working across London means understanding period detail, party-wall etiquette and permit parking as well as we understand glass. We schedule dust sheets, protection and clean-down like a good building firm should.
SpecificationStructural timber or SIPs frame · 150mm PIR insulation · EPDM or standing-seam aluminium roof · Cedar, Accoya, painted-timber, composite or aluminium cladding · thermally-broken aluminium glazing · engineered oak, LVT or polished-concrete floors
What sets our garden rooms apart in London.
Fully Insulated Envelope
150mm PIR or structural SIPs to walls, floor and roof — whole-building U-value 0.18 W/m²K, comfortable in December and cool in July with no bolt-on air-conditioning.
Mains-Powered & Wired
Dedicated RCD-protected consumer unit, ring main, data (Cat6), lighting circuits and optional networked heating — all buried in armoured SWA from the main house by our own electricians.
Heated Year-Round
Panel radiators, low-profile electric underfloor heating or an air-source heat pump — sized to the space so it runs on a fraction of the energy demand of a poorly insulated conservatory.
Bespoke Cladding
Western Red Cedar, thermally-modified Accoya, painted timber, composite or standing-seam aluminium — matched to the palette of your house and garden, not pulled from a catalogue.
Large Aperture Glazing
Full-width aluminium bifolds, slim-frame sliders or fixed picture panes up to 2.7m tall — the front elevation opens the room to the garden the way a summer house never could.
Permitted Development
Most builds fall under PD as an outbuilding: under 2.5m at the eaves, under 3m ridge (pitched roof further than 2m from any boundary). We survey, confirm and, where needed, obtain a lawful development certificate on your behalf.
Turnkey, Single-Point Delivery
Design, foundations, frame, cladding, glazing, electrics, plastering, flooring and decoration — one contract, one named site manager, one aftercare number. No sub-let trades, no gap in accountability.
Plumbed on Request
WC, shower or utility sink runs off the house cold main and drains into the nearest inspection chamber — specified at survey for treatment rooms, gym showers and guest snugs.
Garden Rooms installed across London.
We regularly install garden rooms across London. Explore your town for local detail on planning, postcodes and recent work.
Common questions from London homeowners.
- Do I need planning permission for a garden room?
- Usually not. Under permitted development, an outbuilding under 2.5m tall at the eaves (or up to 3m ridge if further than 2m from any boundary), not occupying more than 50% of the original garden and not in front of the principal elevation, is permitted. Listed buildings, conservation areas and Article 4 zones need full planning — we handle the application on your behalf.
- How long do they take to build?
- A typical garden room is weathertight within 7–10 days on site and complete in 2–4 weeks from ground-breaking, depending on size, cladding and internal finish. Complex pool-house or plumbed builds run 4–6 weeks.
- Can I use it as a bedroom or Airbnb?
- Occasional overnight use falls under PD as an outbuilding. Regular sleeping accommodation or short-let use makes it a habitable dwelling — Building Regs apply, potentially planning too, and Council Tax implications need advice. We flag the distinction at survey and won't build outside the rules.
- How is it heated?
- Panel radiators, low-profile electric underfloor heating, or an air-source heat pump. Because the envelope is insulated to 0.18 W/m²K, energy demand is substantially lower than a poorly insulated conservatory — a 4×3m office holds temperature on a 500W panel through a British winter.
- Do I need foundations?
- In most cases, screw piles or ground screws — installed in a day, no concrete pour, no soil disturbance, and fully reversible if the garden ever needs to be restored. On soft ground or larger builds we use engineered concrete pads. We survey the ground before quoting.
- What cladding lasts longest?
- Thermally-modified Accoya (Class 1 durability, 50-year warranty), composite (25-year colour warranty) and aluminium standing-seam (30-year+) all outlast cedar (15–25 years silvered). Cedar is the classic choice; if you want no maintenance ever, specify Accoya or aluminium.
- Can it be plumbed?
- Yes — a WC, shower and utility sink run off the house cold main and drain into the nearest inspection chamber, provided levels allow. We survey the drainage run at design stage; on tricky sites a Saniflo-style macerator makes it possible where gravity won't.
- Does it add value to the house?
- A well-built, insulated, year-round garden room typically adds 5–8% to the value of a family home in the Home Counties — significantly more than a summer house or shed. It reads as usable floor area in an estate agent's brief, provided the electrics are certified and the build is Part P compliant.
- What guarantee do you offer?
- 10-year insurance-backed guarantee on our workmanship, 25-year cladding manufacturer warranty (Accoya, aluminium and composite), and the standard glazing and hardware warranties. All transferable to a new owner.
Related extensions services in London.
Book your London survey.
Tell us about your London project. A senior surveyor will call within one working day to arrange a free on-site visit and fixed quote for your garden rooms.