How much does a loft conversion cost in Teesside? (2026)
A loft conversion in Teesside costs £15,000 to £25,000 for a Velux rooflight conversion, £30,000 to £50,000 for a rear dormer, £40,000 to £55,000 for hip to gable, £45,000 to £65,000 for an L-shaped dormer and £50,000 to £70,000+ for a mansard in 2026. Simple loft boarding for storage costs £1,000 to £3,000.
Last updated: August 2026, prices reviewed quarterly.
What's actually in a loft conversion quote?
A conversion quote has five components: the structure (steels, new floor joists, roof alterations), the envelope (dormer cladding, windows, roofing), the staircase, the services (electrics, plumbing for an en-suite, heating), and the finishes (insulation, plastering, decoration). Structure is typically 35 to 45% of the total. That is why two quotes for "a loft conversion" can differ by £10,000: one specifies calculated steels, a hardwood stair, an en-suite and building control fees, the other specifies almost nothing. An itemised quote is the only quote worth having.
Building control fees, structural calculations and the completion certificate should all appear as line items. If they do not, ask who is paying them, because someone is.
Per-type pricing, honestly assessed
Velux, £15,000 to £25,000
The cheapest route because the roof shape stays as it is. The money goes on the floor, stairs, insulation and finishes. The catch is head height: below 2.2 metres at the ridge the finished room feels pinched, and you are often only £10,000 away from a dormer that fixes the problem properly.
Dormer, £30,000 to £50,000
The Teesside standard and the best balance of cost against space gained. The bottom of the range is a bedroom with standard finishes; the top adds an en-suite, larger glazing and better finishes. Most semis and terraces land at £35,000 to £42,000 all-in.
Hip to gable, £40,000 to £55,000
A dormer plus the rebuild of the hipped end of the roof. The extra £10,000 over a dormer alone buys back the third of the loft the hip was stealing. On the 1930s semis of Acklam, Hartburn and Fairfield it is the conversion the houses were practically designed for.
L-shaped dormer, £45,000 to £65,000
Two dormers joined over the main roof and the rear outrigger of a Victorian terrace. The most space per pound of any conversion, but more steelwork, more junctions and trickier access on terraced plots.
Mansard, £50,000 to £70,000+
A full rear roof rebuild creating effectively a new storey. Add architect's drawings and planning fees before the build cost. The right choice on larger houses where maximum space justifies the premium.
The extras that move quotes
- En-suite: £4,000 to £8,000 depending on spec and how far the plumbing runs.
- Trussed roof redesign: £3,000 to £6,000 where factory trusses must be engineered out, common on post-1970s estates.
- Water tank relocation or removal: £1,000 to £2,500, often paired with a heating system upgrade on older terraces.
- Asbestos: pre-1980s soffits, flues and tank insulation sometimes contain it; a removal survey adds £200 to £400 and removal is priced on what is found.
- Party wall surveyors: £0 if neighbours consent in writing, £700 to £1,500 per neighbour if a formal award is needed.
- Re-covering the roof: original 1930s coverings near end of life are often worth doing alongside the dormer, £3,000 to £6,000 on top.
How to judge a quote properly
Compare like for like, in writing: the steel specification and calculations, stair position and material, window makes and sizes, insulation values, electrics, whether decoration is included, building control fees, and VAT. The cheapest quote that names nothing is the most expensive conversion you'll ever buy, it just bills you later, in variations and unfinished work.
Seasonal note for 2026: specialist loft conversion diaries on Teesside currently run 8 to 12 weeks out, and late-winter starts are usually easier to book than summer. Scaffolding and materials pricing has been stable this year after two volatile ones.
| Conversion type | Typical price | Time on site | Notes |
|---|---|---|---|
| Velux / rooflight | £15,000–£25,000 | 4–6 weeks | Needs 2.2m+ head height |
| Dormer (rear) | £30,000–£50,000 | 6–8 weeks | The Teesside standard |
| Hip to gable + dormer | £40,000–£55,000 | 8–10 weeks | 1930s hipped semis |
| L-shaped dormer | £45,000–£65,000 | 8–10 weeks | Terraces with outriggers |
| Mansard | £50,000–£70,000+ | 10–12 weeks | Planning required |
| Loft boarding only | £1,000–£3,000 | 1–2 days | Storage, not living space |