Building Service · Greater Manchester
Garage Conversion Specialistsin Salford & Manchester.From cold storage to liveable room, properly.
Convert your single or double garage into a heated, insulated, Building Control-approved room, bedroom, home office, gym, playroom or annexe, on a fixed written price and a 4–6 week programme.
Fixed-price quotes · Building Control sign-off included · Written workmanship guarantee
Overview
What it is, who it's for and why it matters.
What it is
A garage conversion changes an unheated, single-skin or attached-garage space into a habitable, insulated, Building Control-compliant room, new sub-floor, fully insulated walls and ceiling, glazing in place of the up-and-over door, heating and electrics, and a finished room ready to use.
Who it's for
Homeowners who never use their garage for a car. Families needing a fifth bedroom, professionals needing a quiet home office with its own external entrance, and growing households needing a playroom, gym or annexe.
When you need it
Before you outgrow the house. A garage conversion typically adds 14–18m² of habitable space at roughly half the cost-per-m² of a new extension, the best-value space upgrade in most Greater Manchester semis.
Why professional help matters
Most garages were built single-skin, on a thin slab, with no DPC and no insulation. Furnishing them without proper conversion creates damp, cold, mouldy 'rooms' that fail Building Control and reduce resale value. A proper conversion is the opposite, it lifts value and lifts the EPC rating.
What goes wrong
The failures we are most often asked to put right.
Cheap garage conversions are a false economy. These are the failures we are asked to put right most often.
Cold, damp floors
The original slab has no DPC and no insulation. Carpeting it directly will turn the new room into a permanent cold-bridge with condensation underfoot.
Single-skin walls
Most attached garages are 100mm single-skin masonry. Insulating internally only with thin board creates interstitial condensation and black mould inside 12 months.
Up-and-over filled with bricks badly
The opening needs proper toothing-in, a new cavity-tray DPC and a matched-brickwork infill or full glazing system. Cowboys block-and-render it and call it done.
No Building Control sign-off
Without an approved Building Control completion certificate, the converted room cannot be marketed as habitable and your insurance may not cover it.
Our process
A clear, repeatable system, from first visit to final sign-off.
- Step 1
Survey & feasibility
Free site visit. We assess existing slab, DPC, wall construction, head-height and external level. Confirm what's possible.
- Step 2
Design & Building Regs
Drawings and full-plans Building Regs application, including thermal, acoustic and fire performance for the new room.
- Step 3
Fixed-price quote
Line-by-line written quote, 90-day validity, stage-payment schedule tied to milestones.
- Step 4
Build phase
Slab insulation and screed, wall and ceiling insulation, infill of up-and-over with brick or glazing, electrics, heating, plaster, second fix, decoration.
- Step 5
Sign-off & handover
Building Control completion, electrical certification, snag walk-around, written workmanship guarantee and handover pack.
Why work with Renovo
Concrete outcomes, not vague promises.
Cost
Roughly half the cost-per-m² of a new extension. The structure is already there, we are insulating, finishing and certifying it.
Speed
4–6 weeks from start to finish for a typical single garage. Written programme issued with the quote.
No planning headache
Most attached garage conversions are Permitted Development and need no planning permission. We confirm on the survey.
EPC uplift
Properly insulating a previously unheated garage lifts the whole property's EPC band, material at sale or remortgage.
Standalone access
Where the garage has its own external door, we can retain it, ideal for home office, treatment room or annexe.
Resale
A correctly converted, certified garage room reliably adds 5–10% to resale value of a Greater Manchester semi.
Detail & specification
The technical detail, for people who want to know how the work is done.
Read the technical detailHide the technical detail
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Detail & specification
The technical detail, for people who want to know how the work is done.
Read the technical detailHide the technical detail
What conversion typically involves
A standard attached single-garage conversion in Greater Manchester involves the following stages.
- Damp-proof membrane and 100mm PIR insulation over the existing slab, with a new screed or chipboard sub-floor.
- Internal stud wall built off the existing single-skin masonry with 100mm PIR or mineral wool, vapour control layer and plasterboard.
- Ceiling insulated to current Part L U-values; new joists where ceiling height permits.
- Up-and-over door removed, opening toothed in with matching brick or replaced with full-height glazing.
- New radiator or zone added to existing heating system, or electric panel heating where pipework is uneconomic.
- Full electrical fit-out, sockets, lighting, smoke detection, certified by NICEIC-registered electrician.
When conversion does not work
A small minority of garages are unsuitable. Detached garages further than 1m from the house need full-foundation upgrade and external thermal envelope; we still convert them, but they price closer to an extension. Garages with high external ground levels (forming a 'tanked' situation) need additional damp-proofing. We tell you on the first visit if either applies.
Planning & Permitted Development
Most attached garage conversions are Permitted Development. Exceptions: properties subject to Article 4 directions (some conservation areas in Salford, Manchester and Stockport), listed buildings, and properties where Permitted Development rights have been removed by a previous planning condition. We check this on every project.
Residential vs commercial
We also convert commercial garage and store spaces (e.g. mews garages, salon stockrooms, light-industrial storage) into office or studio space under change-of-use planning. Standards are higher (fire compartmentation, accessibility) and we handle the application end-to-end.
Recent work
A look at recent projects across Greater Manchester.
A selection of finished builds. See the full set on the Our Work page.
Areas covered
Garage Conversions across Salford, Manchester and Greater Manchester.
FAQ
Straight answers to the questions clients actually ask.
Still got a question? Call us on 07701 078833 or request a callback.
How much does a garage conversion cost in Salford?+
A standard single-garage conversion in Greater Manchester typically runs £14,000–£22,000 turnkey, including Building Regs, electrics, heating, glazing or brick infill, plaster and decoration. Fixed written quote after free survey.
Do I need planning permission?+
Most attached garage conversions are Permitted Development. We check Article 4 directions, conservation status and any planning conditions on every job.
How long will it take?+
Typically 4–6 weeks for a single garage from start to handover. Double garages 5–8 weeks. Written programme issued with the quote.
Will it match the rest of the house?+
Yes, that is the test. Brick infills are matched on coursing and bond. Glazing systems are colour-matched. Internally, finishes meet your existing skirting profile and floor level where possible.
Will I lose the garage doors?+
Usually yes. The up-and-over is removed and replaced with brick infill or glazing. If you specifically need car access retained, a side door can be designed in.
What about my EPC rating?+
A converted, properly insulated garage usually lifts the property's EPC by one band. Useful at sale and for buy-to-let MEES compliance.
Can I have a bathroom in the converted garage?+
Yes, assuming reasonable proximity to the existing soil stack. We design the drainage at survey stage.
Will my house insurance be affected?+
Usually no, but you must notify your insurer of a change of use from garage to habitable room. We provide the document set for them.
Related services
Often combined with garage conversions.
Next step
Turn the cold storage room into a real room.
Free survey of your existing garage, written fixed-price quote, and 4–6 week programme. No deposit to find out.
- Fixed-price written quote, no day-rate surprises.
- Single accountable team, no subcontractor finger-pointing.
- Stage payments tied to milestones, no large upfront deposit.
- Building Control sign-off and written workmanship guarantee.