Pitched, flat, and crown roofs each come with different material requirements, labour demands, and coverage areas, which significantly influences pricing.
This article outlines the ballpark costs of building each roof type in the UK, with a breakdown across different regions and cost benchmarks ranging from small contractors to larger firms, providing a practical reference to support early-stage advice and cost planning.
Building A Roof In The UK
Pitched, flat, and crown roofs are among the most common options in UK residential construction, each offering distinct advantages.
- Pitched roof: A sloping roof that meets at a ridge, very durable and good for drainage, but uses more materials and takes longer to build.
- Flat roof: A roof with a slight slope for drainage, using fewer materials and usually the cheapest option to build.
- Crown roof: A gently raised roof with shallow slopes on all sides, improving drainage while using less covering than a pitched roof.
Because each roof type is shaped differently, the actual roof area required varies for the same building footprint. So, for a 30m² footprint, our calculations assume a pitched roof covers around 40m², a flat roof about 31m², and a crown roof roughly 35m², reflecting the extra materials needed for slopes and design.
In terms of build specification, BuildPartner gives you three broad options to choose from:
- Basic spec is a basic finish; e.g., Leyland, Everest, Wickes.
- Standard spec is a standard finish; e.g., Dulux, Hamilton, Slim Line.
- Premium spec is a high-spec finish; e.g., Farrow & Ball, Fine Line, Siemens.
In this article, we’ve provided a breakdown of the cost of building a roof according to a standard specification. In addition, we have provided three different benchmarks to show the range of pricing you can expect among different contractors. These are:
- Low benchmark – smaller companies are generally lower cost but less specialised and with low project management function; good for low/mid-spec projects and tight budgets.
- Mid benchmark – medium-sized companies offer a balanced mix of cost-effectiveness and specialisation; good for mid-range projects for effective execution within moderate budgets.
- High benchmark – larger companies generally have a higher cost base but can handle a wide variety of specialist tasks; good for mid/high-spec projects and project management.
The specification and benchmark you choose will have a major impact on the overall cost of building a roof, so it’s important to align them with your budget and the finish you’re aiming for.
Cost of Building A Pitched Roof
Here’s a table showing the average costs of building a pitched roof (40m2) to a standard specification:
| Pitched Roof | Total Average Build Cost | Average Cost Per Sq Metre | ||||
| Low Benchmark | Mid Benchmark | High Benchmark | Low Benchmark | Mid Benchmark | High Benchmark | |
| East Anglia | £16,727 | £18,703 | £20,528 | £418 | £468 | £513 |
| London | £17,572 | £20,170 | £20,413 | £439 | £504 | £510 |
| Midlands | £16,377 | £18,312 | £20,099 | £409 | £458 | £502 |
| North England | £16,776 | £18,758 | £20,588 | £419 | £469 | £515 |
| Northern Ireland | £16,537 | £18,028 | £20,055 | £409 | £451 | £501 |
| Scotland | £16,733 | £18,711 | £20,536 | £418 | £468 | £513 |
| South East | £17,607 | £19,539 | £21,608 | £440 | £488 | £540 |
| South West | £16,358 | £18,666 | £20,487 | £417 | £467 | £512 |
| Wales | £16,024 | £17,917 | £19,257 | £401 | £448 | £481 |
| Average | £16,745 | £18,756 | £20,397 | £419 | £469 | £510 |
All costs exclude VAT, overheads, and profit.
Here’s what the data shows for the cost of building a pitched roof (40m2) to a standard specification:
- The minimum cost is £16,024, and the maximum cost is £21,608.
- The total average cost is £18,633, or £466 per square metre.
Cost Breakdown By Element – London
Here’s a breakdown of the associated costs by room for building a roof – when using a mid-benchmark contractor in London:
| Total | £20,170 | 100% |
| Roof lining | £4,872 | 24.2% |
| Roof coverings | £4,330 | 21.5% |
| Roof structure | £3,751 | 18.6% |
| Scaffolding | £2,509 | 12.4% |
| Fascias | £1,533 | 7.6% |
| Hoarding | £839 | 4.2% |
| Project management | £703 | 3.5% |
| Flashing | £682 | 3.4% |
| Machinery / Equipment | £563 | 2.8% |
| Bargeboards | £282 | 1.4% |
| Roof ventilation | £106 | 0.5% |
Cost of Building A Flat Roof
Here’s a table showing the average costs of building a flat roof (31m2) to a standard specification:
| Flat Roof | Total Average Build Cost | Average Cost Per Sq Metre | ||||
| Low Benchmark | Mid Benchmark | High Benchmark | Low Benchmark | Mid Benchmark | High Benchmark | |
| East Anglia | £11,771 | £13,162 | £14,446 | £380 | £425 | £466 |
| London | £12,342 | £14,081 | £14,406 | £398 | £454 | £465 |
| Midlands | £11,373 | £12,717 | £13,958 | £367 | £410 | £450 |
| North England | £12,101 | £13,531 | £14,851 | £390 | £436 | £479 |
| Northern Ireland | £11,555 | £12,541 | £13,935 | £366 | £405 | £450 |
| Scotland | £11,756 | £13,146 | £14,428 | £379 | £424 | £465 |
| South East | £12,246 | £13,540 | £15,029 | £395 | £437 | £485 |
| South West | £11,344 | £12,974 | £14,240 | £374 | £419 | £459 |
| Wales | £11,085 | £12,395 | £13,346 | £358 | £400 | £431 |
| Average | £11,730 | £13,121 | £14,293 | £379 | £423 | £461 |
All costs exclude VAT, overheads, and profit.
Here’s what the data shows for the cost of building a flat roof (31m2) to a standard specification:
- The minimum cost is £11,085, and the maximum cost is £15,029.
- The total average cost is £13,048, or £421 per square metre.
Cost of Building A Crown Roof
Here’s a table showing the average costs of building a crown roof (35m2) to a standard specification:
| Crown Roof | Total Average Build Cost | Average Cost Per Sq Metre | ||||
| Low Benchmark | Mid Benchmark | High Benchmark | Low Benchmark | Mid Benchmark | High Benchmark | |
| East Anglia | £13,574 | £15,178 | £16,659 | £388 | £434 | £476 |
| London | £14,124 | £16,272 | £16,454 | £404 | £465 | £470 |
| Midlands | £13,176 | £14,733 | £16,171 | £376 | £421 | £462 |
| North England | £14,001 | £15,656 | £17,183 | £400 | £447 | £491 |
| Northern Ireland | £13,424 | £14,606 | £16,234 | £384 | £417 | £464 |
| Scotland | £13,620 | £15,230 | £16,716 | £389 | £435 | £478 |
| South East | £14,214 | £15,714 | £17,444 | £406 | £449 | £498 |
| South West | £13,131 | £15,023 | £16,489 | £375 | £429 | £471 |
| Wales | £12,827 | £14,343 | £15,434 | £366 | £410 | £441 |
| Average | £13,566 | £15,195 | £16,532 | £388 | £434 | £472 |
All costs exclude VAT, overheads, and profit.
Here’s what the data shows for the cost of building a crown roof (35m2) to a standard specification:
- The minimum cost is £12,827, and the maximum cost is £17,444.
- The total average cost is £15,098, or £431 per square metre.
Average Cost To Build A Roof In 2026
So, how much does it cost to build a roof in the UK? Based on the three different roof types covered in this article, you can expect building a roof to cost on average (when using a mid-benchmark contractor):
- Pitched roof (40m2) – £18,756, or £469 per square metre.
- Flat roof (31m2) – £13,121, or £423 per square metre.
- Crown roof (35m2) – £15,195, or £434 per square metre.
Please remember that these costs exclude a contractor’s overheads and profit and VAT. There may be other additional costs, such as obtaining planning permission, conducting structural surveys, making unexpected repairs, and completing custom finishes.
Start your free trial with BuildPartner today to get the most accurate estimate of building an annex based on your own dimensions and specifications.
FAQs About Roof Building Costs In The UK
Here are some frequently asked questions about roof building costs in the UK.
Do roofing costs include insulation?
Some quotes include insulation, underlay, and vapour barriers, while others cover only the structural roof and covering. All costs in this article include insulation, as well as fascia and soffits, but exclude guttering. It’s always best to clarify what is included at the outset to manage expectations.
How much does labour contribute to roof costs?
Labour can make up a significant proportion of roof build costs, particularly for more complex roof types. For a crown roof in London with a total construction cost of £16,271, the cost breakdown is approximately:
- Labour: £8,372 (51%)
- Building materials: £7,050 (43%)
- Finishing materials: £849 (5%)
These figures reflect direct build costs only and do not include VAT, contractor overheads, or profit, which would increase the final price paid by the client.
Do costs vary between new-build roofs and re-roofs?
Re-roofing an existing property typically costs more because it involves additional work such as stripping off the old roof, demolition, waste removal, and disposal, as well as working around an existing structure.
From a contractor’s perspective, access, safety measures, and unknown structural issues also increase labour time and, ultimately, the overall cost.