Loft Conversions and Party Walls – what are the rules?

Empty new room

If you’re planning a loft conversion in a terraced or semi-detached home, it’s likely that your plans will affect a party wall. Any structural work to this shared wall (or shared walls) will require specific permissions from your neighbours in addition to the usual planning permission and building regulations.

Why does a loft conversion require consent from my neighbours?

Even if your conversion falls under ‘permitted development’, the Party Wall Act 1996 will come into effect if you need to cut into a shared wall to install supporting beams for your conversion. If the project involves any other demolition of part of a wall – even if it will be rebuilt soon after – this will require consent.

We recommend talking informally to your neighbour about the project as early as possible, as you will need to agree to the terms of a Party Wall Award in order for the work to commence. Although your neighbour cannot legally stop you from carrying out the work, getting them on board from the beginning will help the process run more smoothly.

Serving notice

You may have been able to have a conversation with your neighbour about your planned works and they may have given you a verbal green light, but you will still need to serve a formal Notice, as specified under Section 3 of the Party Wall Act. This must:

  • Be served to the legal owners of the affected neighbouring property (not necessarily the person living there)
  • Be served two months or more before the intended start date (Notice is valid for up to one year)
  • Include information from the relevant parts of the Act and information about your proposed works
  • Outline the Adjoining Owner’s right to raise objections to the terms of the works, appoint their own surveyor and take measures to protect their home while work is carried out

Party Wall Awards

If the neighbours fail to respond to the Notice, or if they actively dissent, you will need to come to an agreement about the works in the form of a Party Wall Award. This will be drawn up by a jointly-appointed surveyor or through the negotiation of separate surveyors for both parties.

The purpose of the award is to resolve any contentious issues in a fair and practical way. It may cover the plans for the work, acceptable working hours, access allowance and steps to protect both buildings. The award will usually contain a schedule of condition so that any damage that occurs during the works can be properly attributed.

Our team at Squarepoint Chartered Surveyors are expert party wall surveyors in London and will be happy to assist you with any queries you may have about work being carried out on a shared wall. In addition to specific advice about loft conversions, we provide professional expertise for basement extensions and ground-level modifications on behalf of Building Owners and Adjoining Owners. For more information, contact us today.

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Really helpful team at Squarepoint, on hand to help with any queries and take you through the whole process clearly and at a pace guided by you. Our party wall surveyor, Adam, was great at communicating and efficient throughout  the whole process, could not ask for more.

I had been hunting for a simple job that required a surveyor’s expertise, but had been struggling to find trust throughout my enquiries, until I spoke to Adam.

The advice simply and honestly given by Adam on our first call was remarkable. His friendly but competent application and manner made it easy for me to hire him, and not only did he more than deliver on the required services, but his price was the most competitive I could find. Would highly recommend Eve and Adam at Squarepoint.”


I recently hired Adam to help with a party wall award required on both sides of my terraced house.

He was able to liaise with both parties to answer their initial questions/concerns, which led to them both appointing him as the agreed surveyor, which saved me time and money.

Adam prepared the final award comprehensively and quickly. I would thoroughly recommend him and his friendly Admin assistant Eve.

From the very first time I called Scott, he was very attentive to my requirements for a building survey. From the outset he noted down my areas of concern, updated me with progress prior to the survey and gave me a thorough debrief after the survey. The quality of his report was excellent, very easy to understand and, importantly, comprehensive.

I was extremely pleased with the excellent service provided by Scott Buchanan of Squarepoint Chartered Surveyors, and  I hope to contact yourselves in due course with a view to getting further advice.

Working with Adam Graham at Squarepoint was a very smooth and easy process. He was always clear and thorough in our communication and provided very detailed advice. I would highly recommend Squarepoint!”

The team at Squarepoint were very helpful, knowledgeable and understanding when dealing with my loft conversion and party wall agreement.”

We have used Squarepoint Chartered Surveyors at several of our Parishes and have found them to be very efficient in the production of reports on a variety of issues such as building condition surveys and PPM, defect investigations and Party Wall matters.”

Young, trustworthy, professionally competent and committed to delivering on time and on budget.”

Fast and friendly service with an extremely thorough survey. The Surveyor’s phone call to explain the findings of the report, before the official survey was sent, was invaluable.

I used Squarepoint for a party wall agreement. From my initial conversation with Eve through to Adam completing the party wall award, the process was smooth, professional and timely given the challenges of COVID lockdown. Thank you for your great service.