North West garage conversions: turn your garage into the room you actually need.
Family-run garage conversion specialist across Greater Manchester, Lancashire and the wider North West. From £2k tidy-ups to £40k self-contained annexes — fixed-price, written-in-1-working-day, no deposit.
Get a free quote
Reply within 1 working day. We'll never share your details.
Sixteen ways we've turned garages into rooms people actually use.
Most garages don't house cars any more. They sit cold, dusty and forgotten. Here's what they're really good for.
Don't see what you're picturing? We've probably done it. Give us a call and we'll tell you straight whether it'll work.
Five conversion tiers — honest, fixed, written.
Realistic 2026 prices for a standard North West garage, including groundworks, electrics, fitting and materials. Every quote agreed in writing after a free on-site survey.
Garage Refresh
- Clean, paint, tidy electrics
- Basic insulation upgrade
- One radiator / heating point
- Sealed floor & basic lighting
- No building regs needed — stays a garage
Single Room Conversion
- Full habitable room — office, gym, bedroom
- Wall infill, full insulation
- Plastered, painted, finished flooring
- Electrics, lighting, sockets, heating
- Full Building Regs approval
Room + Ensuite
- Bedroom or studio + private ensuite
- Plumbing, soil stack, ventilation
- Full bathroom fit-out
- Heating, electrics, tiling
- Full Building Regs approval
Double Garage
- Full double conversion — one big room or two
- Open-plan or partitioned
- All trades, all materials
- Custom layout to your spec
- Full Building Regs approval
Self-Contained Annexe
- Kitchenette + bathroom + sleeping
- Separate entrance option
- Granny flat, teen pad, rental income
- Independent heating & metering option
- Full Building Regs (planning may apply)
Is a garage conversion the right call for you?
We'd rather tell you it's not a fit than sell you a project you'll regret. Here's the honest answer.
A garage conversion makes sense if…
- Your garage barely gets used — it's storage, a junkyard or a freezing-cold "where stuff goes to die"
- You need extra living space without extending the house footprint
- You want to add value (typical: 10–20% uplift on resale)
- You're working from home and a dedicated room would change your life
- Your kids are growing and you need a bedroom, playroom or teen den
- You run a home business (PT, beauty, pets, consulting) and need a proper workspace
- You'd rather invest £15k once than £200/month in a rented studio for the next ten years
It's probably not the right fit if…
- You genuinely use the garage for the car AND have no other off-street parking — converting may hurt resale
- Your home is listed or in a conservation area with restrictive rules — possible but adds significant time/cost
- Your garage is detached and very far from the house — the project becomes more of an outbuilding fit-out
- You're hoping for a sub-£2k tidy-up that "magically" becomes a proper habitable room — we won't pretend the maths works
- You'd rather extend out into the garden — a full extension may give better room sizes (but costs 2–3× more)
What's actually in your Wolsten quote.
One itemised quote, one fixed price, one crew start to finish. Here's exactly what you're paying for — and the few scenarios that carry an extra line item.
Always included (every conversion)
- Free on-site survey with a fixed written quote within 1 working day
- Building Regulations submission, inspections and sign-off
- Existing garage door removal and disposal
- Wall infill — blockwork, lintels, weatherproofing
- Damp-proof membrane and floor insulation
- New floor build-up with 100mm celotex/PIR insulation
- Full wall & ceiling insulation to current regs U-values
- Plasterboard, skim, two-coat paint throughout
- Full electrical installation — sockets, lighting, heating, switches
- Heating — radiator(s) plumbed into existing system
- New window where required for natural light + ventilation
- Door opening into the house (where applicable) + new door fitted
- Finished flooring (LVT, laminate or carpet of your choice)
- Full site clean-down and waste removal
- Walkthrough and aftercare documents before handover
Things that can add cost
- Plumbing for a bathroom, kitchenette or wet area (adds £3k–£8k depending on scope)
- Structural opening between garage and house — if not already present (£600–£1,500 incl. RSJ/lintel)
- Re-roofing or roof reinforcement on older garages
- Significant damp remediation on garages with existing moisture issues
- Bi-fold or French doors to the garden in place of standard window
- High-spec finishes — engineered oak flooring, designer tiling, AV/cinema kit
- Underfloor heating instead of radiators
- Independent boiler/metering for fully self-contained annexes
Garage conversion vs the alternatives.
Two quick comparisons — one on the project itself, one on who you hire to do it.
Garage conversion vs full house extension
| Factor | Full extension | Garage conversion |
|---|---|---|
| Cost (single room) | £30–60k | ✓ £9–22k |
| Build time | 10–16 weeks | ✓ 2–4 weeks |
| Planning permission | Usually required | ✓ Usually permitted development |
| Building Regs | Required | Required |
| Footprint impact | Loses garden space | ✓ Uses existing footprint |
| Disruption | Major — entire side of house | ✓ Contained to garage area |
| Value added (typical) | 15–25% | 10–20% |
| Best for | Larger spaces, kitchen-diners | ✓ Office, gym, bedroom, annexe |
Wolsten vs a cheap installer vs DIY
| What you get | Cheap installer | DIY | Wolsten |
|---|---|---|---|
| Building Regs handled end-to-end | × Often "your problem" | × Yours | ✓ Included & signed off |
| All trades in-house | × Subbed out | × N/A | ✓ Liam, Ryan, Paul |
| Fixed written quote | Rare — "estimate" | × | ✓ In 1 working day |
| 2-year aftercare commitment | Rarely | × | ✓ |
| £2M public liability insurance | Varies | × | ✓ |
| No deposit required | × Usually 25–50% | N/A | ✓ Pay on milestones |
| Lifespan of finished room | 5–10 years before issues | 3–8 years | ✓ Designed to last decades |
Simple. Transparent. Done properly.
Same five-step playbook on every job — whether it's a £2k refresh or a £40k annexe. See the full Wolsten Way →
Free survey
On-site measurement, soil check, honest advice. No obligation.
Written quote
Within 1 working day. Itemised, fixed, in writing.
Schedule & plan
Building regs submitted. Start date locked in. Day-by-day plan handed to you.
Hands-on build
One of the three of us on site every day. No subcontractors.
Walkthrough
We sweep up, walk you through, hand over warranty & sign-off docs.
From cold concrete to home cinema.
Carrington, Manchester — a single integral garage transformed into a fully kitted-out home cinema with surround sound, theatre seating and acoustic insulation.
Garage to Home Cinema · Carrington
The homeowner wanted a proper screening room — not just "a telly in the garage". We took an ordinary detached garage, stripped it back, built a fully insulated and acoustically-treated room from the ground up, installed a projector mount + surround-sound wiring + dimmable accent lighting, and finished it with a bespoke geometric feature wall and LVT flooring. Total transformation, 10 days on site.
The four shots above walk you through the whole journey — from external view (just an unassuming detached garage) to before (cold concrete, storage, dust), through mid-build progress (fresh plaster, first-fix electrics, downlights cans wired in, plaster drying) to the finished cinema room. We show the build because that's where the quality is — anyone can fake the after shot.
- Project
- Detached single garage → home cinema
- Location
- Carrington, Manchester
- Duration
- 10 days on-site
- Spec
- Acoustic treatment + AV pre-wire + feature wall
Garage conversions across the North West.
The three of us on every job.
You won't deal with a sales rep or a call centre. Liam, Ryan or Paul is on site every day of your build.
Liam
Runs the surveys, writes the quotes, project-manages the bigger conversions. Qualified electrician — handles every electrical fit-out personally.
Ryan
Time-served bricklayer specialising in drylining. Handles the wall infill, blockwork and structural openings on every conversion.
Paul
Master joiner with thirty years on the tools. Every cabinet, door, frame and finished detail is his work.
Garage conversions across the North West.
Based in Westhoughton, Bolton. Most jobs within a 45-minute drive — close enough to know the local planning quirks and to pop back after handover if anything ever needs a second look.
Manchester & Salford M1–M9, M11–M28, M30–M46, M50
Wigan & Leigh WN1–WN8
Oldham & Rochdale OL1–OL12, OL15, OL16
Stockport SK1–SK8, SK14–SK16
Preston & Chorley PR1, PR2, PR5–PR7, PR25, PR26
Warrington WA1–WA5, WA12–WA14
What our customers say.
"We had our garage converted from a storage area to an office/gym. It took 7 days, including fitting a new door and window. Everything went perfectly and whatever was promised was delivered."
"Absolutely delighted. Liam and Paul converted my garage for me, into two rooms. One is a storage area and the second is a work area for my business. All completed in 4 working days (HARD WORK!). Couldn't recommend enough."
"I had a garage converted in August. Converted from a storage room to an office with heating and electric. It's fully kitted out, to a really good standard. I would recommend."
Read all our reviews on our Google Business Profile →
Straight answers to what people actually ask.
How much does a garage conversion cost in the North West?
It depends entirely on what you're converting it to. A basic refresh starts around £2k. A full single-room conversion (office, gym, bedroom) typically £9k–£22k installed. Adding an ensuite pushes it to £22k–£28k. Double-garage conversions £25k–£35k. A self-contained annexe with kitchenette and bathroom: £28k–£40k+. Every Wolsten quote is fixed in writing after a free on-site survey — the price you see is the price you pay.
How long does a garage conversion take?
A standard single-garage conversion takes 2–4 weeks on site. Add an ensuite and you're looking at 3–5 weeks. A full double-garage conversion: 4–6 weeks. A self-contained annexe: 5–8 weeks. A basic refresh (Tier 1) is usually 3–7 days. Building Regs sign-off happens at the end and is typically same-week.
Do I need planning permission?
In about 90% of cases, no. Most garage conversions fall under permitted development rights, meaning you don't need a full planning application. Exceptions: listed buildings, properties in conservation areas, conversions that significantly extend the footprint, and full self-contained annexes if used as a separate dwelling. We'll flag any planning requirement at the free survey.
Do I need Building Regulations approval?
Yes — always, without exception, if you're converting to a habitable room. Building Regs cover insulation, electrics, ventilation, fire safety and structural integrity. Wolsten handles the full submission, inspections and sign-off for you. That's all included in your fixed quote — no separate application fees to manage.
Will a garage conversion add value to my house?
Yes, typically. A well-built garage conversion adds 10–20% to the property's value in most North West markets — significantly more than the cost of the conversion itself. The exact uplift depends on local market conditions and what you've converted it to. Bedrooms with ensuites tend to add the most; pure utility space adds the least.
Integral vs detached garage — what's different?
An integral garage is attached to your house and shares a wall (often with an internal door). Conversions are simpler — heating and electrics extend from the existing system, and the new room becomes part of the house. A detached garage needs its own services run from the house, plus weatherproofing and potentially a covered walkway. Detached conversions are usually 15–25% more expensive than equivalent integral ones, and may approach the cost of a small outbuilding.
What about insulation, damp and heating?
This is where corners get cut by cheap installers and it's why you end up with a cold, damp, mouldy room within 18 months. A proper Wolsten conversion includes: 100mm PIR floor insulation on a fresh damp-proof membrane, wall insulation to current U-values, ceiling insulation, fully sealed thermal envelope, and a heating point plumbed into your existing system. The end result feels exactly like any other room in the house — warm, dry, properly built.
Can I convert if my garage is currently my only off-street parking?
You CAN, but think hard. Converting your only off-street parking can reduce resale value, particularly in city-centre or terrace properties where parking is at a premium. We'll always flag this at the survey. Options: keep the garage door for visual flexibility, only convert the back half (keeping a smaller car-port), or accept the trade-off if the space matters more than the parking.
Cinema / office / gym / annexe — which gives the best return?
By resale value: a bedroom + ensuite or self-contained annexe typically adds the most. By lifestyle return: completely depends on what you'd actually use — a £15k home gym you use 5 days a week is worth more than a £25k spare bedroom that's empty 50 weeks of the year. We'll talk through your actual use case at the survey, not just sell you the most expensive option.
Single vs double garage conversion — costs and considerations?
A double garage gives you roughly twice the floor area but doesn't cost twice as much — usually 1.3–1.8× the cost of a single. Lots of options open up: a master suite with walk-in wardrobe and ensuite, an open-plan home office + meeting room, a one-bedroom annexe, or simply a much bigger family room. Double garages also handle structural openings more easily if you want to knock the wall through into the house.
What's actually under the floor when you convert?
A proper Wolsten floor build-up is a layered system:
1. Existing concrete slab swept, cracks filled
2. Fresh DPM (damp-proof membrane) laid
3. 100mm PIR insulation board
4. Vapour control layer
5. 22mm chipboard floor or screed
6. Underlay
7. Your chosen flooring (LVT / laminate / carpet)
Skip any one of these layers and you risk damp, cold floors, or floor failure within a couple of years. This is what separates a £9k Wolsten job from a £4k cowboy job.
Can I keep the garage door for resale flexibility?
Yes — it's increasingly popular. We can build the wall infill behind the existing door, leaving the door cosmetically in place so the house "still looks like it has a garage" from the street. The room behind is fully insulated and finished as habitable space. Buyers see flexibility, you keep the converted space. Adds roughly £500–£1,200 to the quote.
How much disruption is the build day-to-day?
Much less than an extension. We work entirely within the garage footprint — no need to access the main house except occasionally for water and power. There's a few noisy days at the start (removing the door, breaking out the floor) and a couple of dusty days at the plastering stage. Otherwise it's quiet, contained work. Most clients carry on as normal throughout.
What the quote actually means.
Every quote is full of terms that sound technical for the sake of it. Here's what they mean in plain English — so when you compare three quotes side by side, you can tell which one's actually specifying quality.
RSJ (Rolled Steel Joist)
The structural steel beam that goes above a knocked-through opening between the garage and the house. Required by Building Regs when you're removing load-bearing wall — properly specified by an engineer, not eyeballed.
Lintel
A smaller structural beam over a window or door opening. Wall infill below the garage door usually needs a new lintel above any new window cut into it.
DPM (Damp-Proof Membrane)
A thick plastic sheet laid between the concrete floor slab and your new floor build-up. Stops rising damp from the ground reaching your insulation and flooring. Non-negotiable on any garage conversion.
PIR / Celotex insulation
Rigid foam insulation board (often the orange Celotex brand). High thermal performance per mm of thickness — ideal for garage floors and walls where space is tight. Current Building Regs typically require 100mm minimum on floors.
Breather membrane
A wrap behind the new wall infill that lets vapour escape outwards while stopping water from getting in. Critical for preventing condensation build-up inside the wall.
U-value
The measure of how well a wall, floor or ceiling holds heat. Lower numbers = better insulation. Current Building Regs require U-values of 0.18 W/m²K for floors and walls in conversions. Wolsten always meets or exceeds these.
Drylining
A method of finishing internal walls by fixing plasterboard directly to a metal or timber frame rather than wet-plastering the brickwork. Quicker drying time, more insulation depth, smoother finish.
Acoustic plasterboard
A denser, thicker plasterboard that reduces sound transmission. We use it on cinema, music studio and bedroom conversions — extra £4–£8 per m² but transforms the soundproofing performance.
Beam and block flooring
An alternative floor build-up using pre-cast concrete beams with insulated infill blocks. Used on detached or older garages where the existing slab isn't suitable. Adds £1–£2k to the build but bulletproof for the long term.
Fire door rating (FD30, FD60)
If your conversion creates a new opening into the house, Building Regs require an FD30 (30-minute fire-rated) door at minimum — sometimes FD60 if it's near a bedroom or escape route. We supply and fit to spec, included in the quote.
Garage conversions in your town.
Looking for details specific to your area? Jump to the local page for pricing examples, recent jobs and team notes.
Ready to turn your garage into something useful?
Free survey, fixed written quote in 1 working day, no deposit, no pressure. If you're not sure what to convert it to, we'll talk you through the options on the call — no obligation.
