Do I need planning permission for a garden room?

Most garden rooms fall under permitted development — no planning application needed. The exceptions are conservation areas, listed buildings and larger structures. We check this for you during the quote stage. A Lawful Development Certificate (£129) is worth getting even when permission isn't required, as proof for future buyers.

Can I use a garden room as an office all year round?

Yes, if it's properly insulated. Target U-values: roof below 0.20, walls below 0.25, floor below 0.22. With those values, heating cost for a 15 m² room runs roughly £100–£200 per year.

How much does a garden room actually cost, all in?

A typical mid-range project (15–20 m², fully insulated, electrics in) runs £18,000–£28,000. Larger or higher-spec rooms reach £40,000–£50,000. The per-m² figure is misleading for small rooms.

How long does a garden room take to build?

On-site build is usually 1–3 weeks, depending on size and specification. Add 2–4 weeks lead time before that for foundations and frame manufacture.

Bath · Garden Rooms by city

Bespoke Garden Rooms in Bath

Insulated garden rooms designed for year-round living, not just summer. TM Carpentry manages every aspect of your garden room project, from foundations and structural framing to insulation, cladding, roofing and the complete interior finish. We coordinate all specialist trades, including electrical, plumbing and plastering where required, giving you a single point of contact and a seamless build from start to finish. Whether it’s a home office, gym, studio or annexe, you’ll have a fully finished space that’s ready to use. Available across Bath, Bristol and Keynsham

Get a written quote See recent work

10+years in the trade

16areas covered

9services in-house

£2Mpublic liability

What's included

Every garden rooms job covers the items below — always. The exact specification depends on your space and what you want it to do.

Foundations (ground screws or concrete pad)
Timber frame construction
Insulation to year-round U-values (roof, walls, floor)
External cladding (timber, composite or render)
Roofing — EPDM, felt or insulated panels
Doors, windows and interior fit-out

About garden rooms in Bath

What garden rooms typically look like in Bath

Bath garden rooms typically work within the Bath World Heritage Site and Bath Conservation Area, which means most garden rooms need a planning application rather than relying on permitted development. Garden sizes across Bath are smaller than Bristol's — typically 5–10m of usable rear garden depth on Georgian and Victorian terraces. Tom works with B&NES Conservation Officer expectations where the room sits in a visible position from the house or street.

Honest note: The descriptions below are generalisations — what's typical or commonly found across Bath's neighbourhoods. Every property is different, so Tom will always confirm what's actually there on the site visit before quoting.

Planning & permissions

The planning context in Bath

Most residential streets in Bath fall within the Bath World Heritage Site and many are within the Bath Conservation Area. Permitted Development rights for outbuildings are restricted in these areas — beyond the standard PD rules (under 2.5m ridge, 2m from boundary, single-storey rear), Conservation Area consent is usually needed for any outbuilding over a small threshold. Most Bath garden rooms end up going through a full planning application with B&NES, especially if the room is in a side return or visible from the street. Listed Building Consent is needed for any garden room in the grounds of a Grade II listed property. Tom will tell you what's needed on the site visit before any work starts.

Common garden-room patterns in Bath

Common Bath garden room patterns: 2.5–3m wide single-room offices in the rear garden of Georgian and Victorian terraces (sized to PD thresholds where possible), 4×4m garden studios with insulated walls and EPDM roofs, small garden gyms tucked into awkward side-return spaces, and (more rarely) larger garden annexes in the wider Victorian villas in Oldfield Park and Larkhall. Most Bath garden rooms are 10–15m² — a useful working space without needing a full-size rear extension. Cladding choices lean toward timber (larch or cedar) to match Bath stone context, with composite for low-maintenance on rear-of-property sites. Most jobs require a structural engineer (loads + foundation design) and sometimes a planning consultant for the application.

Areas in Bath

Garden rooms in Bath — by area

Each area below has its own hub page with the typical garden size, planning context, and FAQs specific to that neighbourhood.

Our step by step process

Every job follows the same six stages. Some are quicker, some are slower — but the order and what to expect at each point is fixed, so you're never wondering what's happening.

01
Planning check
Most garden rooms fall under permitted development. We confirm this for your specific site and flag any conservation-area or listed-building complications up front.
02
Design and quote
Size, position on the plot, intended use, services needed. Fixed-price quote.
03
Foundations
Ground screws or concrete pad, depending on ground conditions. Usually a single day.
04
Frame and roof
Timber frame raised, roof fitted, windows and doors installed. Most rooms take 1–2 weeks on site.
05
Insulation and cladding
Insulation fitted to target U-values (roof below 0.20, walls below 0.25, floor below 0.22). External cladding applied.
06
Interior finish
Lining board, flooring, electrics (first-fix and final). Snagging and sign-off.

Garden rooms by city