Do you need a party wall notice for roof work?

On a terrace or a semi, the wall between two houses is a party wall. It is shared in the sense that it carries the weight of both properties, and it normally runs up through the loft to the underside of the roof. The chimney stack above it often serves both houses, with the flues running side by side.

That is why roof work on a terraced street can touch a neighbour's property without anyone setting foot on their land. Your roof slope belongs to your house, but the wall beneath the ridge, and sometimes the stack on top of it, does not belong to you alone. If you have walked the terraces of the Railway Village on one of the outings in our guide to Swindon's attractions, you will have noticed rows where every house shares its walls and its stack with the next.

Semi-detached and end-of-terrace houses are in the same position on the one side where they touch a neighbour. Detached houses have no party wall, so the Act seldom enters the picture for them.

GOV.UK's guide to party walls names the building work that needs a word with the neighbour first. Two entries matter to roofers: making cuts in the shared wall, and removing chimneys that stand on it. Section 2 of the Act also lets the building owner cut back the footing or any projecting breast, jamb or flue at the shared wall, and a notice is how that right is used.

On a real roof that means demolishing a shared chimney stack, chasing a groove into the brickwork for new flashing, or taking out the breast inside the house. Removing a breast needs Building Regulations approval in its own right because it is part of the structure, as the Planning Portal makes clear, and an engineer's advice is sensible. The page on chimney repairs describes what such work involves.

The notice reaches your neighbour a minimum of two months before work starts, with a year as the outer limit. Section 3 of the Act sets the two-month minimum on the notice, and a quicker start is allowed only if the adjoining owners and the adjoining occupiers agree in writing.

If your neighbour consents, they should reply in writing within 14 days. Silence is not agreement, and you cannot treat it as consent. Should they object, the Act sets out a procedure for settling the matter, and a party wall surveyor can explain where you stand. Treat this as general guidance, not legal advice, and ask a surveyor or solicitor to look at your own circumstances.

Tell your roofer early. A job that depends on a two-month notice period needs planning around it, and nobody should lift a tile from a shared stack until the paperwork is in order. Starting before the notice period has run, or without consent, is how disputes begin.

Stripping and re-covering your own slopes, with new battens, underlay and tiles or slates, does not in itself cut into a party wall or remove a chimney. It appears nowhere on the GOV.UK list, so a plain re-roof does not normally involve a notice at all. Our answer on telling the neighbours about a roof replacement covers the courtesy side of it, which is a separate matter from the legal position. Even when no notice is due, a short conversation over the fence, before scaffolding goes up and before the noise starts, keeps relations easy for the weeks the job will take.

Watch for the exceptions. Renewing the flashing where your roof meets the party wall can mean cutting into the brickwork. A shared ridge, a shared valley or lead that runs across the boundary can turn a simple job into shared work. Anything of this kind that the survey turns up goes into the written quote along with our view of whether a notice is likely, so you can decide before a start date is booked.

People often mix the three up. A party wall notice concerns your neighbour's rights. Planning permission concerns how the building looks and how it affects its surroundings, and planning permission for roof work has its own rules. Building Regulations concern whether the work is sound and safe, and building control in Swindon explains who signs that off. Holding one of these does not give you the other two.

If your house is in a National Landscape or a conservation area, read roof work in the North Wessex Downs and Cotswolds alongside this page. The party wall rules do not change in such places, but the planning position can.

You, as the building owner, serve the notice. A roofer does not serve it on your behalf, and you should not leave it to us. What we do at the survey is look for any contact with a shared wall or stack, photograph the area and put the scope in writing. At Skyline Swindon Roofing we go through consent with you as part of the quote, and the Building Regulations notification is ours to handle whenever the work is notifiable. If you are unsure whether a job that reaches into the structure needs a roofer or a builder, roofer or builder: who should do your roof work helps you decide.