The short answer
A like-for-like repair with matching material, laid as it was, often needs no consent. Changing the covering, the pitch, the lead detailing or a chimney usually does. B&NES Council grants listed building consent, which runs separately from planning permission, and carrying out unapproved work is a criminal matter, so ask the council first.
Repair, renewal and alteration are different things
Consent turns on how far the work changes what makes the building special. The lowest-risk end is a repair that restores the roof to its earlier state with identical material. Fitting a matching natural slate where one has cracked is a repair. Swapping a whole slope of natural slate for man-made slate is an alteration, because the look, the weight and the way the roof weathers all change.
The same test applies to the parts that are easy to overlook. Re-leading a valley gutter in lead to the existing pattern is likely to sit on the repair side. Swapping lead for another metal, raising a parapet, cutting in a roof window or rebuilding a chimney at a new height all drift towards alteration. Where there is real doubt, neither you nor your roofer gets to decide. The planning officers at B&NES decide whether a proposal needs consent.
Listing covers the whole building, inside and out, and not only the street elevation. That takes in the roof, the chimneys and the structure in the loft. A rafter or purlin that looks like plain old timber can be part of what the listing protects.
Who grants consent in Bath, and how it works
In Bath listed building consent is granted by B&NES, the unitary council. It treats consent and planning permission as separate permissions, so a house may need one, both or neither, and it asks owners to speak to its planners before any work begins. Its conservation officers take calls on 01225 394041 on Tuesdays and Thursdays, and the council's own listed buildings page sets out the process.
With around 5,000 listed buildings in Bath, the officers see roof questions all the time. Send photographs of the roof and a short description of the repair, and keep whatever reply you get. When you sell, the buyer's legal team may well ask to see it.
The whole city is a World Heritage Site and about half of it sits in a conservation area, so the setting matters as well as the building. Our page on roofs in a World Heritage city explains how that backdrop shapes what gets accepted, and the conservation area roof rules cover the neighbouring question for unlisted houses.
What goes wrong when owners guess
The risk is not a small fine for a tidy mistake. B&NES is clear that work done without approval is a criminal offence, and the duty to put things right can follow the building to whoever owns it. A roof covered in the wrong material can be ordered back to its earlier form, which means paying for it twice.
There are quieter costs. A sale can stall when the buyer's side finds work with no consent behind it. An insurer may question a claim on a roof that was altered without approval. Neither is hard to avoid with a phone call at the start.
Roofers can make the problem worse. A contractor who shrugs that nobody checks, or who quotes the cheapest covering without raising consent, has handed you the risk. A roofer who brings up consent in the first conversation is planning the job properly. Our roofing guarantee page covers what stands behind the workmanship once the consent question is settled.
What we do before touching a listed roof
Our free survey comes first, with photographs of your own roof, so the damage and its cause are on record. From that we work out the smallest repair that will do the job and whether it keeps the roof as it was built. Where it does, we suggest you confirm with B&NES, because the council makes the call, not us.
We match materials on older roofs. On a listed roof the covering we propose is the covering already there, and lead is laid to the pattern it replaces. We use the traditional methods the listing was written around, such as lime mortar where stonework is being repointed, rather than cement that can damage old stone.
Sometimes the job grows once the slates are lifted, for example a rotten run of battens or a failed valley that turns a patch into a re-roof. We pause and report back before carrying on. Work that triggers consent goes through properly, and where Building Regulations also apply we explain that side too. The survey is followed by a written fixed price. Start from our main page or call 01225 285181.
Questions to settle before you book any roofer
These are worth putting to every roofer and to the council.
- Is my building listed, and at what grade? You can check the list entry on the Historic England website. Grade affects how closely changes are examined, not whether you need to ask.
- Does the repair keep the same material and pattern? If yes, ask B&NES to confirm in writing. If no, expect to apply.
- Is the chimney, parapet or valley part of the job? These are the parts most likely to be treated as alteration.
- Who is dealing with the application? Agree this in writing before work starts, along with who pays any fees.
- Is anything in the loft being cut or replaced? Original roof timbers can carry the same protection as the slates above them.
Never start work in the hope of tidying up the paperwork afterwards. Consent is far easier to obtain in advance than to argue for later.
