How to Keep Your Neighbours Onside Even If You Are Building Right Against Their Wall

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On a terrace or a semi, your loft sits against someone else's wall. The Party Wall Act gives you a legal process for that. A good relationship with the neighbours gives you something the Act cannot, which is goodwill when scaffolding goes up and the drill starts.

Do both. Talk to your neighbours before any paperwork arrives, then follow the Act's process.

Talk to them before the notice arrives

A legal notice from a stranger is a poor introduction. Knock on the door first. Show your drawings, explain what you plan to build and when it will start, and tell them how long the noisy stage lasts. Give them your phone number and your builder's number.

Explain that a formal notice will follow and that it is a legal step, not a sign of a dispute. Ask whether they have worries about access, noise or their own plans for the house. Write down what they say.

When a loft triggers the Party Wall Act

The Act applies when work touches a shared wall. Our guide to party walls and loft conversions covers each trigger. The common ones are:

• Steel beams or purlins bearing on the party wall. Cutting pockets into the shared wall needs a party structure notice, served two months before work starts.
• Raising or thickening the party wall. A new parapet or a taller wall also needs a two-month notice.
• A hip-to-gable wall built at the boundary. A new wall on or beside the boundary needs a line of junction notice, served one month before work starts.
• Cutting into a shared chimney breast. Works to a party chimney fall under the Act.

Work that stays inside your own property and leaves the shared wall alone, such as a rooflight in your own roof slope, does not need a notice.

How the notice process runs

A notice stays valid for 12 months. If work has not started by then, you serve a fresh one. The Act sets a process. A neighbour cannot veto the work, but the award controls how you carry it out.

What neighbours can do

An adjoining owner has three choices. They can consent in writing. They can dissent and appoint a surveyor, or agree to share one with you. Or they can say nothing, which counts as dissent after 14 days.

Surveyors owe a duty of impartiality under the Act, even when one side appoints them. Their award can set working hours, protection for the neighbouring property, access arrangements and the schedule of condition. Do not start the work before the notice period ends unless your neighbour consents in writing.

The schedule of condition

A schedule of condition records the state of the neighbour's property before work starts. The surveyor photographs ceilings, walls, the loft space and any existing cracks. The record protects both sides. You can show that a crack pre-dated the work, and your neighbour can show that new damage followed it.

Day-to-day behaviour during the build

• Working hours. Most London councils expect noisy work between 8am and 6pm on weekdays and 8am to 1pm on Saturdays, with no work on Sundays or bank holidays. Check your council's rules and set the hours in your building contract.
• Noise and vibration. Cutting pockets in the party wall and fitting steel makes the loudest noise. Tell your neighbours which days it will happen.
• Weather protection. An open roof exposes both houses to rain. Ask your builder how they will protect the roof void and the party wall each night.
• Scaffolding and access. You need your neighbour's permission to put scaffolding on their land or to enter it. The Party Wall Act gives a right of entry for works under the Act, with notice, and a surveyor can set the terms. Scaffolding on the pavement needs a council licence.
• Skips, parking and deliveries. Skips on the road need a permit. Plan deliveries so lorries do not block driveways.
• A named contact. Give your neighbour one phone number. Return their call the same day.

Planning consultation is a separate process

If your loft needs a planning application, the council tells neighbours and invites comments. An objection counts only when it raises a material planning matter, such as overlooking, loss of light or the effect on the street. Under Permitted Development no consultation takes place, so the first formal contact your neighbour receives is often the party wall notice. Talk to them first.

If a neighbour objects or ignores you

• Stay calm and keep every message in writing.
• Appoint or agree a surveyor and let the process run.
• Do not start before the notice period ends unless you hold written consent.
• Keep your neighbour informed at each stage, even when they disagree with you.
• Ask your surveyor to explain the position if your neighbour raises a point you do not understand.