Garage Conversions · Stockport
Garage Conversions in Stockport,Turning Wasted SpaceInto 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.
From 4 weeks on site · Fully insured · Building Control handled
14+ Yrs
Building experience
200+ Projects
Delivered across Cheshire
Local
Stockport-based, Lewis-led
Fully Insured
Public liability cover
48-Hour Reply
Fixed-price quotes
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.
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.
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.
Planning & Approvals
We handle planning applications, building regulations, party-wall notices and structural drawings end-to-end.
Build Phase
One accountable team on site, daily progress updates, protected work areas and a tidy site every evening.
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.
Most cost-effective space gain
Typically 40–50% cheaper per square metre than an equivalent extension.
Fast turnaround
Most garage conversions complete on site in 4–6 weeks.
Minimal disruption
External works first; internal connection to the house is the final step.
Adds resale value
A certified, properly converted garage adds usable accommodation to the EPC and floor plan.
Energy efficient
Properly insulated to Part L — won't be a cold spot in the house.
Fully certified
Building Regs Completion Certificate on handover, plus Workmanship we stand behind.
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.
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.
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.
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.
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.
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 QuestionNext 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.
Serving Stockport, Cheadle, Bramhall, Hale, Wilmslow, Altrincham, Sale, Didsbury & Trafford