There is no reliable national price for a commercial roof repair. Area, access, substrate condition, drainage, detailing, programme and the specified system all change the scope. Treat online figures as budget prompts, not a quotation.
What a comparable quotation should show
Ask each bidder to state the surveyed area and exclusions; preparation and local repairs; access, welfare and protection; the named membrane or coating; detailing; drainage work; programme assumptions; and the guarantee offered. A price without these items is not like-for-like.
Where hot work is proposed, the method statement and controls should be considered before cost alone. HSE publishes general fire and explosion guidance for dutyholders.
Repair, overlay or replacement?
A local repair may be appropriate when the defect is isolated and the surrounding construction is dry and serviceable. An overlay can be considered only after compatibility, adhesion and moisture risks have been assessed. Replacement may be the better option where the deck, insulation, falls or existing build-up cannot support a durable repair.
Request options with assumptions and evidence from the condition survey. For liquid systems, see our national liquid waterproofing service; for an asset-specific recommendation, contact the technical team.
Procurement checks
Confirm who designs the detail, who is responsible for temporary weathering, and whether any proposed manufacturer guarantee is available for this project. Ask for the guarantee terms, duration, exclusions and issuing party in writing before appointing.