Most oak building firms won't put a price on their website, which makes it hard to know whether your idea costs £5,000 or £50,000 before you ask for quotes. Some firms do publish prices, though, and put side by side they give a fair picture of what each kind of oak building costs.
Every figure below comes from the firm's own website, read in October 2026, and the firms are listed at the end with links. We haven't adjusted, averaged or guessed anything: where a firm gives a range, we give its range. Prices change and every site is different, so use these to set a budget, then get quotes.
- Cheapest published oak price
- £1,650: a small oak roof over a front door, as a kit (Crown Oak Buildings)
- Oak garage kit for one car
- From £3,650 before VAT (Round Wood of Mayfield)
- Finished two-car garage with a room above
- £95,000–£150,000 (Sussex Oak Structures)
- Finished 30 square metre oak extension
- £105,000–£150,000 (Sussex Oak Structures)
Three words that change the price
“Kit” means the frame is delivered for someone else to put up. “Fitted” or “frame erected” means the firm puts the frame up, usually on a base you have paid someone else to lay. “Completely finished” (some firms say “turnkey”) means the firm does everything, from the foundations to the roof, windows and inside walls. The same building can cost three or four times as much finished as it does as a kit. VAT matters too: some firms show prices before VAT, which adds a fifth, and some don't say.
Oak porches
- Small roof over the door, 1.2m × 0.9m
- Kit £1,650 + fitting £1,320 + clay roof tiles £880 (Crown Oak, VAT not stated)
- Open porch, 1.8m × 1.2m
- Kit £2,640 + fitting £1,320 + clay roof tiles £2,200: about £6,000 in all (Crown Oak)
- Porch with glass sides and a door, 2.4m × 1.8m
- Kit £4,158 + fitting £1,901 + front door £1,474 (plus £198 to fit) + clay roof tiles £2,310: about £10,000 (Crown Oak)
- Porch kits
- Advertised(The Porch Specialist, size and VAT not stated)from £688
None of these includes a brick base or foundations. More on porches, including the planning rules, on our page about oak porches in Surrey.
Oak carports and garages
- Carport, one car, flat roof, 3m × 5.3m
- From £3,000 (Crown Oak)
- Carport, two cars, 5.5m × 5.3m
- From £5,500 (Crown Oak)
- One-car garage kit
- £3,650–£6,100 before VAT, £4,380–£7,320 with VAT, depending on roof style and log store (Round Wood)
- Two-car garage kit
- £5,950–£8,400 before VAT, £7,140–£10,080 with VAT (Round Wood)
- Two-car garage, oak front, softwood sides and back
- From £5,500 (Crown Oak)
- Garage frames
- Most £5,000–£35,000 for the frame alone
- A two-car frame about £15,000 on average (English Heritage Buildings)
Oak garages with a room above
- Kit, two / three / four cars
- £18,200 / £22,200 / £26,200 before VAT
- £21,840 / £26,640 / £31,440 with VAT (Round Wood)
- Two cars, frame put up
- £40,000–£55,000 (Sussex Oak Structures, 2026)
- Two cars, roof, walls and windows on
- £65,000–£88,000 (Sussex Oak Structures)
- Completely finished, one / two / three cars
- £70,000–£110,000 / £95,000–£150,000 / £130,000–£210,000 (Sussex Oak Structures)
- Same two-car garage in ordinary timber, finished
- £55,000–£85,000 (Sussex Oak Structures)
A garage with a room above always needs planning permission. For timber (softwood) garages, which cost much less, and the planning rules for garages, see our page on oak and timber garages in Surrey.
Oak garden rooms
- Small, 3m × 3m, built and closed in
- £20,000–£30,000 (Sussex Oak Structures, 2026)
- Medium, 4m × 5m, built and closed in
- £30,000–£45,000 (Sussex Oak Structures)
- Large, 5m × 6m, built and closed in
- £45,000–£60,000 (Sussex Oak Structures)
- Medium, completely finished and ready to use
- £40,000–£55,000 (Sussex Oak Structures)
- For comparison: a non-oak garden office, installed
- From £12,750 with VAT for a small pod
- A 5m × 3m office typically(The Green Rooms, Lyne)£22,000–£27,000
Sussex Oak Structures' “built and closed in” prices cover the oak frame, insulated panels, roof, glazing and outside finish; it adds £3,000–£8,000 for foundations depending on the ground, £2,000–£5,000 for electrics and £2,000–£8,000 for inside finishing. It says a supply-only frame saves roughly 25–35%. Firms that build ordinary (non-oak) garden rooms in Surrey are compared in our guide to garden rooms and garden offices.
Oak extensions
- 30 square metres, closed in against the weather
- £72,000–£96,000 (Sussex Oak Structures, 2026)
- 30 square metres, completely finished
- £105,000–£150,000 (Sussex Oak Structures)
What pushes the price up
Going by what the firms themselves list as extras: the ground (Sussex Oak says a sloping site or poor soil can add £10,000 or more to a garage's foundations); how much of the building is really oak, since many “oak” garages have softwood walls and roof timbers, and Oakmasters says the share of oak versus softwood largely sets its price; roof tiles, which Crown Oak prices separately; doors and windows; drawings (Crown Oak charges £350–£500 + VAT, taken off the price if you order) and an engineer's calculations (from £950 + VAT at Crown Oak); and delivery, which almost every kit maker charges on top.
Where these prices come from
Sussex Oak Structures
Near Horsham, West Sussex
Its cost-guide pages are the most detailed we found, giving a range for each stage of the job and the extra costs that catch people out.
- Prices published for
- Garages with a room above, garden rooms and extensions, at each stage from frame to finished
- Contact
- 01293 851287
Crown Oak Buildings
Edenbridge, on the Kent–Surrey border
Sells kits, puts frames up, or does the whole job near its workshop. Its pages don't say whether prices include VAT.
- Prices published for
- Porches (kit, fitting and tiles listed separately), carports and garages
- A design tool gives instant quotes
- Contact
- 01732 866910
Round Wood of Mayfield
Mayfield, East Sussex
Delivers kits across mainland England and Wales, usually in 8–14 weeks, and can recommend installers. More in our guide to oak frame building kits.
- Prices published for
- Almost 50 oak garage kits, from one car to four, and garages with a room above
- Contact
- 01435 860260
English Heritage Buildings
Woods Corner, East Sussex
Makes oak and Douglas fir frames for its recommended builders, or yours, to put up.
- Prices published for
- Garage frames, as a range and an average for two cars
- Contact
- 01424 838643
The Green Rooms
Lyne, near Chertsey
Included only as a comparison with oak garden rooms. See our garden rooms guide for more.
- Prices published for
- Garden pods, offices and rooms, installed
The Porch Specialist (Woods Corner, East Sussex) supplied the porch kit figure. For the firms that build oak in Surrey and what each one makes, see our main guide to oak-framed buildings in Surrey.
Common questions
How much does an oak framed building cost in Surrey?
On firms' published 2026 prices: about £6,000 for a small open oak porch with fitting and a tiled roof (Crown Oak Buildings); from £3,000 for an oak carport (Crown Oak); from £3,650 before VAT for a one-car garage kit (Round Wood of Mayfield); £40,000–£55,000 for a completely finished medium oak garden room, and £95,000–£150,000 for a finished two-car garage with a room above (Sussex Oak Structures).
How much does an oak garage cost?
As a kit, from £3,650 before VAT for one car and £5,950 for two (Round Wood of Mayfield); English Heritage Buildings says most garage frames cost £5,000–£35,000. A completely finished two-car oak garage with a room above costs £95,000–£150,000 on Sussex Oak Structures' 2026 figures.
How much does an oak garden room cost?
Sussex Oak Structures' 2026 prices for an oak garden room built and closed in are £20,000–£30,000 for a small 3m × 3m room, £30,000–£45,000 for a medium 4m × 5m room and £45,000–£60,000 for a large 5m × 6m room, with foundations, electrics and inside finishing extra. It puts a completely finished medium room at £40,000–£55,000.
How much does an oak extension cost?
Sussex Oak Structures puts a typical 30 square metre oak extension at £72,000–£96,000 closed in against the weather, and £105,000–£150,000 completely finished, on its 2026 figures.
How much does an oak porch cost?
Crown Oak Buildings lists a small open oak porch (1.8m × 1.2m) at £2,640 as a kit plus £1,320 fitting and £2,200 for clay roof tiles, about £6,000 in all, and a porch with glass sides and a door at around £10,000. Its pages don't say whether VAT is included.
Is oak more expensive than timber?
Yes. Sussex Oak Structures prices the same completely finished two-car garage with a room above at £95,000–£150,000 in oak and £55,000–£85,000 with an ordinary timber frame.
