All Well Property Services provides professional garage conversions across South East London. Prices range from £15,000to £40,000. Typical build time: 4–8 weeks. All projects include a fixed-price contract, single project manager, and full Building Control sign-off. Call 020 3920 9617 for a free consultation.
What We Offer
Your garage is wasted space. We convert it into a home office, extra bedroom, playroom, or self-contained annexe — fully insulated, heated, and signed off to Building Regulations. It won't feel like a garage when we're done.
- ✓Single and double garage conversions
- ✓Home office conversions
- ✓Additional bedroom or playroom
- ✓Self-contained annexe builds
- ✓Full insulation and damp proofing
- ✓Heating and electrical installation
- ✓Flooring and plastering
- ✓Building Regulations sign-off
Typical Investment
4–8 weeks | Fixed-price contracts
Single garage conversion
Bedroom, office, or playroom
£15,000 – £25,000
Double garage conversion
Studio, annexe, or multi-room
£25,000 – £40,000
Most clients typically invest between £18,000 and £28,000 for a well-insulated, fully finished single garage conversion.
Fixed-price contracts | No hidden costs | 4–8 week typical build
What Affects the Cost?
- •Single vs double garage
- •Intended use (bedroom vs self-contained annexe)
- •Insulation and damp proofing requirements
- •Plumbing (en-suite or kitchenette adds cost)
- •Flooring specification and underfloor heating
Our garage conversion experience
Garage conversions are particularly popular in the suburban areas of South London where 1930s-1950s housing stock has integral or attached garages now used for storage rather than parking. Since 2020 we have run garage conversion projects across SE and SW London. Project mix covers home office conversions, extra bedroom or playroom conversions, self-contained annexes with kitchenette and shower room, and utility room or gym conversions. Median single-garage conversion lands at £18,000-£22,000; double garage at £30,000-£38,000. The boroughs we work in most often for garage conversions: Bromley, Beckenham, Anerley, Penge, Sydenham, Catford, Croydon (where 1930s suburban housing dominates), and on a smaller volume in Wandsworth, Putney, Tooting (where the housing mix includes some 1930s semis with garages). Standard 4-8 week build time, with most projects finishing within the original schedule.
Standards and compliance for garage conversions
Building Regulations sign-off is mandatory for any garage conversion to habitable use. The work covers insulation (Building Regulations Part L: U-value 0.18 W/m²K for walls and floors in habitable rooms), ventilation (Part F: trickle vents on windows, mechanical extract on bathrooms or kitchenettes), fire safety (Part B: fire-rated doors and protected escape routes if the converted garage is used as a bedroom), structure (Part A: foundation assessment and load calculations), and electrics (BS 7671: NICEIC certified circuits). Floor levels typically need raising 150-200mm with insulated screed (75mm Kingspan PIR plus 65-70mm liquid screed) to match the existing house floor and meet the U-value requirement. The garage door is typically replaced with a new insulated wall and window. For change of use planning: most conversions are permitted development and need no planning application, but properties built since the 1980s often carry a planning condition requiring the garage to be retained for parking. We check the planning history on the local authority portal at the survey and apply for variation of condition where needed. We carry NICEIC for electrical certification, Gas Safe for any kitchenette or shower-room gas connection, CHAS for site safety, and Public Liability insurance to £5 million.
How we deliver garage conversions
Single project manager runs the conversion from survey to handover. Standard build is 4-8 weeks: week 1 insulation and damp proofing, weeks 2-3 first-fix electrics, plumbing, and plasterboard, weeks 4-5 second fix and finishes, weeks 6-8 painting, decorating, and snagging. Fixed-price contracts cover everything: insulation, structural assessment, replacement of garage door with insulated wall and window, electrics, any plumbing for kitchenette or shower, flooring, plastering, decoration, and Building Control fees. The price doesn't change unless the specification does. For self-contained annexe conversions, we coordinate the additional Building Regulations requirements (separate fire escape, ventilation rates for habitable rooms, sound insulation between annexe and main house). The completed annexe meets habitable standards and can be used as guest accommodation, an elderly relative's space, or for informal home-office use. We operate from Unit 1 Limes Avenue, Anerley, London SE20 8QR. Companies House number 12721034. 57 verified Google reviews averaging 4.5 out of 5 stars.
Free tools for planning your project
No email required. Get instant estimates and planning answers before you book a consultation.
Garage Conversion Calculator
Estimate the cost of converting your garage into living space. Factor in garage size, intended use, plumbing requirements, and your borough for a personalised cost breakdown.
Best Month
See historic rainfall and temperature for your postcode every month, plus the best window for external work. Live data from the Open-Meteo archive (Met Office and ECMWF).
Listed Check
Check whether your property is a listed building or sits inside a conservation area, and what that means for renovation work. Live data from Planning.data.gov.uk and Historic England.
Planning Risk
Traffic-light check of every planning restriction at your postcode: listed buildings, conservation areas, Article 4 directions, Tree Preservation Orders, flood zones. Live data from Planning.data.gov.uk.
Recent Garage Conversions Projects
Garage Conversions across South East London
What Our Customers Say
“All Well managed our project from start to finish. The fixed-price contract meant no surprises, and the result is stunning.”
Verified Customer
“Professional team, clean site, and they handled all the paperwork. Would recommend to anyone.”
Verified Customer
“Great communication throughout. They kept to the timeline and budget exactly as quoted.”
Verified Customer
Accredited & Certified
Frequently Asked Questions
- Do I need planning permission to convert my garage?
- Most garage conversions fall under permitted development rights and do not require a formal planning application, provided you are not changing the overall footprint or height of the building and the use remains ancillary to the main dwelling. The conversion must still meet Building Regulations — which is a separate process from planning permission and covers structural integrity, insulation, ventilation, fire safety, and electrics. If your property is a listed building, in a conservation area, or if the original planning consent included a condition that the garage must be retained for vehicle parking (common on estates built after 1970), you will need approval before converting. Some properties also have restrictive covenants in the title deeds limiting garage use — your solicitor or Land Registry title documents will confirm this. We check all of these factors during the free site visit and advise you before any commitment, including reviewing any relevant planning history on your local council's online portal.
- Will a garage conversion need to meet Building Regulations?
- Yes, every garage conversion must comply with Building Regulations (Approved Documents A through P) regardless of whether planning permission is needed. The key areas covered are structural integrity (the garage floor and walls must support habitable use — concrete floors often need levelling or a new screed), thermal insulation (walls must achieve a U-value of 0.3 W/m²K or better, typically requiring 75-100mm insulated stud walls), ventilation (adequate natural or mechanical ventilation for the intended use, with trickle vents in new windows), fire safety (FD30 fire-rated doors between the conversion and the main house, interlinked smoke detectors, and safe escape routes), damp proofing (a new damp-proof membrane is usually required in the floor, often combined with 50-75mm floor insulation), and electrical safety (all new wiring must be Part P compliant and NICEIC certified). We manage the entire Building Regulations process, including the initial application to your local authority, interim inspections at key stages, and the final completion certificate.
- Does a garage conversion add value to my home?
- A well-finished garage conversion typically adds 10-20% to the value of your property, making it one of the most cost-effective home improvements available in South London. At a cost of £15,000-£25,000 for a single garage conversion, the return on investment is often higher than a loft conversion or extension when measured as a percentage of the build cost. According to Rightmove and Zoopla data, an additional habitable room can add £40,000-£60,000 to a property in boroughs like Bromley, Lewisham, and Bexley. The actual value added depends on what you convert it into — an extra bedroom or dedicated home office tends to add more value than a utility room or general storage space. The key to maximising value is ensuring the conversion looks and feels like a proper room, not a converted garage. That means level flooring, proper insulation meeting current Building Regulations, adequate ceiling height of at least 2.3 metres, and a finish that matches the rest of the house.
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