Turn your unused Merton garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulations drawings with Part L thermal compliance, structural calculations for any removed walls.
A garage conversion drawings package in Merton, where the stock is largely Victorian villas in Wimbledon; Edwardian terraces in Tooting and Colliers Wood; 1930s semi-detached in Morden and Raynes Park; post-war flats in Mitcham, is the full measured-survey-to-submission drawing set London Borough of Merton needs in order to determine an application: existing and proposed plans, elevations and sections at 1:100 and 1:50, a location and site plan, and the supporting statements the case officer asks for.
Prepared and reviewed by the chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI insured.Last reviewed 2026-08-03.
Turn your unused Merton garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full building regulations drawings with Part L thermal compliance, structural calculations for any removed walls.
Housing stock in Merton: Victorian villas in Wimbledon; Edwardian terraces in Tooting and Colliers Wood; 1930s semi-detached in Morden and Raynes Park; post-war flats in Mitcham.
Character: Wimbledon is heavily conservation-controlled; outer Merton (Morden, Mitcham) is permissive.
We check whether your Merton garage conversion needs planning permission or qualifies as Permitted Development — most integral garages don't need planning.
Full laser-measured survey of the existing garage, plus adjacent rooms where walls are being removed.
Existing and proposed floor plans, elevations and sections at 1:50 — full council-ready specification.
Garage conversions must meet current energy-efficiency standards — upgraded insulation, glazing U-values, heating specification.
Steel beam and padstone design where garage doors are replaced with walls and windows, plus any load-bearing wall removals.
Full Plans submission to Merton Council Building Control or an approved inspector with inspections coordinated through to completion certificate.
Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a free survey.
Build costs are separate and quoted by your contractor. See our published fees.
Every Merton postcode district we draw in, the stock that dominates it and the authority that validates a garage conversion there. Merton fees below are the statutory England rates for 2026, not garage conversion estimates.
| Postcode | Area | Dominant stock | What it means for a garage conversion |
|---|---|---|---|
| SW19 | Wimbledon / Colliers Wood | Victorian villas, Edwardian terraces | SW19 straddles a boundary: Wimbledon / Colliers Wood addresses fall to Merton Council or Wandsworth Council, so confirm which authority validates the garage conversion before submitting SW19 drawings. |
| SW20 | Raynes Park | Victorian villas, Edwardian terraces | SW20 covers Raynes Park only; Merton Council handles the garage conversion, and Raynes Park case officers apply the SW20 conservation-area map. |
| SM4 | Morden | 1930s semi-detached, post-war flats | A garage conversion at an SM4 address in Morden is determined by Merton Council under its own Local Plan policies for Morden. |
| CR4 | Mitcham | 1930s semi-detached, post-war estates | CR4 covers Mitcham only; Merton Council handles the garage conversion, and Mitcham case officers apply the CR4 conservation-area map. |
| SW16 | Streatham / Norbury | Edwardian terraces, post-war flats | SW16 straddles a boundary: Streatham / Norbury addresses fall to Lambeth Council or Wandsworth Council or Merton Council or Croydon Council, so confirm which authority validates the garage conversion before submitting SW16 drawings. |
| SW17 | Tooting / Earlsfield | Edwardian terraces | Tooting / Earlsfield is split at SW17. Either Wandsworth Council or Merton Council can determine a garage conversion here, so the SW17 address is checked against both policies maps first. |
Roof pitch, wall build-up and plot depth change every few Merton streets, and each one changes what a garage conversion can achieve at that address.
Conservation areas covering Merton: Merton Council runs 28, and Wimbledon Village, John Innes, Mitcham Cricket Green are the ones Merton owners meet most. A garage conversion inside a Merton conservation area loses permitted development, so the Merton submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Wimbledon Common a garage conversion is judged on the street elevation first.
Article 4 and your Merton garage conversion: Merton Council has made no borough-wide direction, so permitted development for a garage conversion in Merton generally survives outside Merton conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a SW19 owner records that a garage conversion was lawful.
The building fabric around Merton: Victorian villas in Wimbledon; Edwardian terraces in Tooting and Colliers Wood; 1930s semi-detached in Morden and Raynes Park; post-war flats in Mitcham. Wimbledon is heavily conservation-controlled; outer Merton (Morden, Mitcham) is permissive. A garage conversion in Merton is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Merton Council.
Sources for this Merton garage conversion page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
Of 34 change-of-use appeals decided in Merton over the window covering appeals decided 2016-2026, Merton was upheld more often than most London councils — only 17.6% of appeals succeeded, against 29.1% across London. 6 were allowed and 28 dismissed. Turning a garage or outbuilding into habitable space is usually decided as a change of use, and 34 such Merton decisions were challenged far enough to reach an inspector.
Half of those Merton appeals took more than 106 days to decide from the day the appeal started — time added on top of the council's own determination period, which is the argument for getting the application right first. 100.0% were decided by written representations rather than a hearing or inquiry, meaning the written case and the drawings were the whole of the evidence.
34 change-of-use appeals decided in Merton. Source: Planning Inspectorate casework, OGL v3.0.
Direct answers to the questions Merton homeowners ask every week about garage conversion drawings.
Start a free quote →Most integral garage conversions in Merton do not require planning permission — they're classed as an internal alteration, which is not development under the TCPA 1990. However, if the conversion materially alters the external appearance (new windows, raising the roof), planning permission may be required. Detached garage conversions to habitable use always need planning. Article 4 Directions in Merton may also affect eligibility. We confirm the planning route before quoting.
A Merton garage conversion is one of the cheapest ways to add habitable space: our package covers the planning route assessment, building regulations drawings and structural calculations for the door opening. Build cost depends on whether the garage is integral or detached, and on insulation, flooring and services. See our fees.
Typically yes — a well-executed garage conversion in Merton adds 10–15% to property value and costs far less per square metre than an extension. In areas where parking is not at a premium, converting an underused garage is one of the most cost-effective ways to gain living space.
A standard integral garage conversion in Merton typically takes 4–6 weeks to build once drawings are approved. Our architectural package takes 3–4 weeks from instruction to Building Control submission. Total timeline: approximately 3–4 months from initial survey to completion.
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