Listed buildings and conservation areas
What should you ask if a listed roof shows a mix of older and newer slates?
Ask which slopes have which slates, and what condition each patch is in. A newer patch is not proof that consent was granted, and it is not proof the rest of the covering is sound. The survey should describe slipped, broken and mismatched slates it could see. It does not apply for consent to keep them or to replace them.
Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.
What is the fuller explanation?
Listed roofs are often repaired in pieces. The survey can usually see the difference from the ground or from a loft, and it should say where it could not see, such as a hidden slope. Matching is a condition and a weathering question: thin old slates beside thick new ones can wear differently. Historic England’s listing explanation does not turn the surveyor into the person who approves the next repair.
Your solicitor asks about past consent if the papers matter. Do not hold up a leak while that is sorted, and do not assume a neat patch was unlawful. The inspection does not decide either way. If nail sickness or a failed valley sits beside the new slates, those are the defects to put in front of a roofer. The mix itself is the clue to ask what was done, not a verdict.
What should you ask your surveyor?
- Which slopes are newer, and which did you not see?
- Are slates slipped or broken, or only different in thickness and colour?
- Are you deciding whether the past repair had consent?
What are the typical next steps?
- Give a roofer the defects, not a consent theory.
- Give the solicitor the question of past consent if you need the papers.
- Do not strip sound older slates because they do not match the patch.
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
If only the ridge looks newer, were the slopes recovered as well?
Not unless the survey could see that. A newer ridge can sit on mixed slopes. Ask which slopes were actually seen.
Can the surveyor specify the slate you must reuse?
They can describe what is there. Specifying a consented repair is a later instruction, not this report.