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Our guide to serving a party wall notice

6 min read
Oct '25 • by Heather

Quick summary

To serve a party wall notice, you need to do so at least two months before starting work, and construction can only begin after this period or once a party wall agreement is in place. If neighbours agree, work can start immediately; if they dissent, you'll need to appoint surveyors and secure an award, which can cost from a few hundred pounds and take a couple of months.

Whether you’re building an extension or converting your loft, if you’re undergoing a substantial renovation and have neighbours, then you might be faced with the Party Wall Act.

However, don’t let this legal term scare you. Our experts have put together this handy guide, so you can understand what a party wall is and how to go about gaining all the legal permissions you need to start building.

And don’t forget, if anything in this article seems confusing, our team is always on hand to offer free consultation!

What is a party wall agreement and do you need one?

A party wall is a wall, boundary, or outbuilding that you share with another household. These are common between terraced and semi-detached houses but can also affect detached properties if you share a garden wall or invisible boundary line.

If your project affects a party wall or you plan on excavating within 3 to 6 metres (depending on the depth of the new foundations) of your neighbour’s property, then you need to obtain permission from the affected households at least 2 months before any construction occurs.

In order to obtain approval, you’ll need to serve what’s known as a ‘party wall notice’. If your neighbour replies with written permission, then a ‘party wall award’ won’t be needed and work can go ahead. At Resi, our team always advises that a photographic survey of the neighbours property is completed, even if they sign the notices. This is a vital piece of information in the event that structural damage occurs and a dispute arises.

However, if your neighbour dissents to the notice, then you’ll need to appoint a party wall surveyor (or maybe two) in order to put a ‘party wall agreement’ together and secure the award.

Tip: If cost is important, we would suggest that you and the neighbour/s try to appoint an agreed surveyor. You/the building owner will be responsible for the fees, but this approach will generally be cheaper. More on this below.

How much will construction cost?