--- title: "Garage Conversions Stockport | Habitable Rooms" description: "Convert your unused garage into an insulated home office, gym, snug or bedroom. Stockport's specialist garage conversion builders. 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Your itemised quote follows once we have properly surveyed the work and agreed the scope with you." } }, { "@type": "Question", "name": "Are you fully insured?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Greenbank Building Services Ltd carries comprehensive public liability insurance." } }, { "@type": "Question", "name": "Which areas do you cover?", "acceptedAnswer": { "@type": "Answer", "text": "We cover Stockport, Cheadle, Bramhall, Hale, Wilmslow, Altrincham, Sale, Didsbury and the wider Trafford area." } }, { "@type": "Question", "name": "Do you handle planning and structural drawings?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — we manage planning applications, building regulations and structural engineer drawings end-to-end." } }, { "@type": "Question", "name": "How long has Greenbank been trading?", "acceptedAnswer": { "@type": "Answer", "text": "Greenbank Building Services Ltd has been trading since 2017, and Lewis Gormley has been managing residential building projects across Stockport and Cheshire since 2011. Company No. 10785566." } } ] }, { "@context": "https://schema.org", "@type": "Service", "serviceType": "Garage Conversions", "name": "Garage Conversions in Stockport", "provider": { "@type": "GeneralContractor", "name": "Greenbank Building Services Ltd", "telephone": "+447360269988", "url": "https://greenbankbuildingservices.co.uk", "address": { "@type": "PostalAddress", "streetAddress": "79 Altrincham Rd, Gatley", "addressLocality": "Stockport", "postalCode": "SK8 4EG", "addressCountry": "GB" } }, "areaServed": [ { "@type": "City", "name": "Stockport" }, { "@type": "City", "name": "Cheadle" }, { "@type": "City", "name": "Bramhall" }, { "@type": "City", "name": "Hale" }, { "@type": "City", "name": "Wilmslow" }, { "@type": "City", "name": "Altrincham" }, { "@type": "City", "name": "Sale" }, { "@type": "City", "name": "Didsbury" }, { "@type": "City", "name": "Trafford" } ], "description": "Convert your unused garage into an insulated home office, gym, snug or bedroom. Stockport's specialist garage conversion builders. Building Regs handled.", "url": "https://greenbankbuildingservices.co.uk/services/garage-conversions", "offers": { "@type": "Offer", "url": "https://greenbankbuildingservices.co.uk/contact", "priceCurrency": "GBP", "availability": "https://schema.org/InStock", "itemOffered": { "@type": "Service", "name": "Garage Conversions" } } }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How much does a garage conversion cost in Stockport?", "acceptedAnswer": { "@type": "Answer", "text": "A standard single garage conversion typically costs £15,000–£25,000 fully finished. Double garages run £25,000–£40,000. Final cost depends on whether plumbing is required (en-suite or utility) and the level of finish." } }, { "@type": "Question", "name": "How long does a garage conversion take?", "acceptedAnswer": { "@type": "Answer", "text": "Single garage conversions typically complete in 4–6 weeks on site. Double garages 6–8 weeks. Design and Building Control approval beforehand usually adds 3–4 weeks." } }, { "@type": "Question", "name": "Do I need planning permission?", "acceptedAnswer": { "@type": "Answer", "text": "Garage conversions are usually Permitted Development as long as the external appearance change is modest. Conservation areas and houses with existing planning conditions on the garage may require permission. We check this for free at survey." } }, { "@type": "Question", "name": "Do I need Building Regulations approval?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — always. Converting a non-habitable space (garage) to habitable use requires a full Building Regs application. We handle this end-to-end and provide the Completion Certificate on handover." } }, { "@type": "Question", "name": "Will the converted garage be cold?", "acceptedAnswer": { "@type": "Answer", "text": "No. Properly insulated to current Part L standards, your converted garage will be as warm as any other room in the house. Cold conversions are the result of cut corners on insulation." } }, { "@type": "Question", "name": "Can I convert just half the garage?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — we regularly do partial conversions where the front of the garage stays as storage or utility and the rear becomes habitable. The dividing wall is built to fire and sound regulations." } }, { "@type": "Question", "name": "Will it affect my home insurance?", "acceptedAnswer": { "@type": "Answer", "text": "You'll need to inform your insurer of the change of use, but premiums rarely change significantly. We provide all the certification you'll need." } }, { "@type": "Question", "name": "Do you remove the existing garage door?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — the door, frame and lintel are removed, the opening is infilled with bonded blockwork tied into the existing structure, and a new window is installed to match the rest of the property." } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://greenbankbuildingservices.co.uk/" }, { "@type": "ListItem", "position": 2, "name": "Services", "item": "https://greenbankbuildingservices.co.uk/services" }, { "@type": "ListItem", "position": 3, "name": "Garage Conversions", "item": "https://greenbankbuildingservices.co.uk/services/garage-conversions" } ] } ] --- [![Greenbank Building Services](/assets/greenbank-logo-D73iH9SF.png)](/) [Home](/)[About](/about) Services Service Areas [Our Work](/our-work)[Reviews](/reviews)[Contact](/contact) [07360 269988 ](tel:+447360269988)[Enquire](/contact) ![Garage conversion in progress with freshly plastered walls, new patio doors and prepared sub-floor ready for finishes](/assets/garage-conversion-hero-aE4MgURK.jpg) [Home](/)[Services](/services)Garage Conversions Garage Conversions · Stockport # Garage Conversions in Stockport, Turning Wasted Space Into Daily Living Space. Most Stockport garages store boxes, bikes and a chest freezer. Converted properly, that same footprint becomes a home office, gym, playroom or extra bedroom — for a fraction of the cost of an extension. [Request a Consultation](/contact)[07360 269988](tel:+447360269988) From 4 weeks on site · Fully insured · Building Control handled In short A garage conversion is one of the fastest ways to add a usable room, typically taking from four weeks on site. Work covers insulating and raising the floor, infilling or reglazing the door opening, damp-proofing, heating, electrics and finishes. Most single-garage conversions fall under permitted development, and Building Control sign-off is handled for you. 14+ Yrs Building experience 200+ Projects Delivered across Cheshire Local Stockport-based, Lewis-led Fully Insured Public liability cover 48-Hour Reply Site visit booked Overview ## What you need to know about garage conversions. An integral or attached garage is the most under-used 15–20m² in most British homes. Converting it is the fastest, lowest-disruption way to add habitable space — provided the conversion is done to current Building Regulations rather than as a 'cosmetic' job that fails at sale time. ### What it is We convert single, double, integral and attached garages into fully habitable rooms — home offices, gyms, snugs, playrooms, bedrooms, utilities and ground-floor en-suites. Every conversion includes new insulated floor and walls, blockwork infill of the garage door, new windows, electrics, heating, plastering and decoration. ### Who it's for Homeowners who never use the garage for a car, families who need a downstairs bedroom for elderly relatives, remote workers needing a separate office, and anyone wanting more space without the cost of a full extension. ### When you need it When the garage is wasted storage, when you need an extra room urgently, or when an extension is either too expensive or restricted by your plot. ### Why a specialist Garage floors, walls and roofs are not built to habitable standards. Converting them requires raising the floor, insulating walls and roof to Part L, ensuring damp-proofing, and getting Building Regs sign-off. Skip any of these and you've created a cold, damp, unsellable room. The Real Risk ## What happens when this goes wrong. We've been called in to remediate dozens of failed garage conversions in Stockport over the years. The same five problems come up every time. ### Risks of cutting corners - Persistent damp and mould from inadequate damp-proof membrane installation under the new floor. - Cold floors and walls because the conversion didn't include proper Part L insulation. - Building Regs failure at sale stage — buyers' solicitors flag uncertified conversions and force completion to be delayed or aborted. - Condensation on single-glazed or thinly-glazed replacement windows. - Electrical work done without Part P certification, requiring tear-out and re-do. ### Common homeowner mistakes - Treating it as a cosmetic job — plasterboard over the existing brick without insulation. - Reusing the existing garage floor without raising or insulating it. - Infilling the garage door opening with timber stud instead of properly bonded blockwork. - Omitting trickle vents and mechanical extract — guaranteeing condensation problems. - Hiring a 'handyman' instead of a builder registered with a competent persons scheme. Our Process ## How we deliver, step by step. 01 ### Free Site Survey Lewis attends in person to measure, assess constraints and understand what you actually want — not what's easiest for us to sell. 02 ### Design & Fixed Quote Once we've fully scoped the work on site, you receive an itemised, fixed-price quotation with drawings or specification sheets where required. Larger projects take longer to price properly — never a vague allowance. 03 ### Planning & Approvals We handle planning applications, building regulations, party-wall notices and structural drawings end-to-end. 04 ### Build Phase One accountable team on site, daily progress updates, protected work areas and a tidy site every evening. 05 ### Sign-Off & Guarantee Full walk-through, snagging completed before invoice, and your personally backed workmanship — Lewis returns to put right anything that isn't right issued on handover. Benefits ## Why homeowners choose Greenbank. 01 ### Most cost-effective space gain Typically 40–50% cheaper per square metre than an equivalent extension. 02 ### Fast turnaround Most garage conversions complete on site in 4–6 weeks. 03 ### Minimal disruption External works first; internal connection to the house is the final step. 04 ### Adds resale value A certified, properly converted garage adds usable accommodation to the EPC and floor plan. 05 ### Energy efficient Properly insulated to Part L — won't be a cold spot in the house. 06 ### Fully certified Building Regs Completion Certificate on handover, plus Workmanship we stand behind. Compare Your Options ## Garage conversion or extension — which gives better value? If you rarely park in the garage, converting it is almost always the cheaper route to an extra room. This is how the two options compare. Option Time on site Guide cost Disruption Trade-off Single garage conversion From 4 weeks £15,000–£25,000 Low — work is contained Loses garage storage and parking Double garage conversion 5–7 weeks £22,000–£38,000 Low to moderate Can keep half as storage Single-storey rear extension 10–14 weeks £2,200–£3,000 per m² High — garden and kitchen affected Adds footprint and resale value Most conversions fall under permitted development, but Building Control sign-off is always required. We handle it. Technical Detail ## The detail that separates a 30-year job from a 5-year one. Garage conversions look simple. Done properly, they're a small but meticulous structural and thermal job. Here's the technical detail behind every Greenbank conversion. 01 ### Floor build-up The existing garage slab is typically 100mm of unreinforced concrete with no insulation and often no damp-proof membrane. We either lay a new insulated floor over the top (DPM, 100mm PIR insulation, 65mm screed or chipboard floating floor) or, where headroom allows, break out the existing slab and build up from scratch. Final floor level is matched to the rest of the house. 02 ### Wall insulation External walls are typically single-skin brick or 100mm cavity. We dry-line internally with a 50mm PIR-backed plasterboard or 70mm timber stud with mineral wool fill — achieving a U-value of 0.28 W/m²K or better. All junctions are taped to maintain airtightness. 03 ### Garage door infill The garage door opening is removed and replaced with a properly bonded blockwork infill, tied into the existing structure with stainless steel ties. A new window is installed, sized and proportioned to match the rest of the house frontage. We render or brick-finish externally to suit the property. 04 ### Roof and ceiling Existing flat or pitched garage roofs are insulated to current standards — typically 150mm of PIR between rafters with 50mm under-rafter insulation, or warm-roof construction where the roof is being recovered as part of the works. 05 ### Electrics, heating and ventilation All electrical work is carried out by Part P registered electricians and certified accordingly. Heating is extended from the existing system (we check boiler capacity first) — typically a thermostatic radiator or, on larger conversions, a small underfloor heating zone. Background ventilation via trickle vents and a humidity-controlled extract fan eliminates condensation risk. FAQ ## Garage Conversions — your questions, answered. Lewis personally responds to every enquiry. [Ask a Question](/contact) ### How much does a garage conversion cost in Stockport? ### How long does a garage conversion take? ### Do I need planning permission? ### Do I need Building Regulations approval? ### Will the converted garage be cold? ### Can I convert just half the garage? ### Will it affect my home insurance? ### Do you remove the existing garage door? Related Services ## You may also need [Home Extensions ](/services/home-extensions)[Full Property Renovations ](/services/full-property-renovations)[Structural Works ](/services/structural-works) Next Step ## Ready to get a real price for your garage conversions project? Free site visit. Itemised, detailed fixed-price quote after a proper site survey. No pressure. Just an honest plan you can trust. [Request a Consultation](/contact)[07360 269988](tel:+447360269988) Serving Stockport, Cheadle, Bramhall, Hale, Wilmslow, Altrincham, Sale, Didsbury & Trafford Greenbank — Stockport, Est. 2017 ## Built with confidence. Built to last. ![Greenbank Building Services](/assets/greenbank-logo-D73iH9SF.png) Stockport's residential building specialists. Extensions, renovations and bespoke home improvements crafted to stand the test of time. [](https://www.facebook.com/greenbankbuilding)[](https://www.instagram.com/greenbankbuilders/?hl=en) ### Services - [Loft Conversions](/services/loft-conversions) - [Garage Conversions](/services/garage-conversions) - [Home Extensions](/services/home-extensions) - [Roofing](/services/roofing) - [Kitchens](/services/kitchens) - [Bathrooms](/services/bathrooms) - [Structural Works](/services/structural-works) - [Full Renovations](/services/full-renovations) ### Areas - [Stockport](/areas/stockport) - [Altrincham](/areas/altrincham) - [Trafford](/areas/trafford) - [Didsbury](/areas/didsbury) - [Wilmslow](/areas/wilmslow) - [Cheadle](/areas/cheadle) - [Bramhall](/areas/bramhall) - [Sale](/areas/sale) - [Hale](/areas/hale) - [FAQs](/faq) ### Contact - [07360 269988](tel:+447360269988) - [Info@greenbankbuildingservices.co.uk](mailto:Info@greenbankbuildingservices.co.uk) - 79 Altrincham Rd, Gatley, Stockport SK8 4EG - Mon–Fri · 8:00am – 6:00pm Sat–Sun · Closed © 2026 Greenbank Building Services Ltd · Co. 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