The communal roof is condition rating 3. Does the survey state your percentage share of the eventual cost?

What is the fuller explanation?

Leaseholders often assume a block of ten means ten per cent, or that a top-floor flat pays more because it is closer to the weather. Sometimes the lease does say something like that. Sometimes it uses floor area, equal shares, or a method that leaves out commercial units. The surveyor does not extract that fraction and does not apply it to a bill that has not been priced. Get contractor quotations if you want a build-up, and ask the solicitor for any scheme the landlord has already named. The rating itself still has not done the arithmetic, and it still has not named your share.

Ask the solicitor for the service-charge proportion in the lease and for any notice that already names a scheme. Keep that proportion beside the rating, not inside it. If consultation thresholds might be in play, those are triggers for a process, not a price for this roof and not your percentage. Do not negotiate by inventing both the contract sum and your slice of it. One missing number times another missing number is not a deduction you can explain to a lender.

What should you ask your surveyor?

• Does the report contain a percentage, or only a roof rating?
• Are you leaving the lease fraction entirely to the solicitor?
• What quotations would you expect a buyer to get before they commit?

What are the typical next steps?

1. Ask the solicitor for the proportion the lease actually states.
2. Get quotations before you treat the roof as a numbered bill.
3. Do not invent a percentage from the number of flats you counted on the stair.

Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.

Also asked about this

Which pages should you read next?

• The block is run by an RTM company. Does the survey say you now own the freehold?
• One loft tank appears to feed this flat and the neighbour's. Why is that a title and plumbing question, not a roof rating?
• New windows have no trickle vents and the developer's snagging list does not mention them. What ventilation path is absent, and what decoration snag has not answered it?
• Guide: What should a survey of a leasehold flat cover?
• All UK home survey questions

Sources

• GOV.UK: Leasehold property (service charges, Section 20 consultation thresholds, and the right to challenge)
• RICS: RICS Home Surveys (Home Survey Standard)
• RICS: House surveys: the costs, types and benefits of an RICS home survey