Update your party wall award after your plans change

Blueprint plan with a revision cloud round a changed room and dimension, pinned beside a sealed addendum award

For building owners in England and Wales whose design, programme or scope has moved on since the award was served. Compare quotes from party wall surveyors to amend it correctly.

A party wall award describes the work in detail: where the beams go, how deep the foundations are and how long it will take. If plans change, for example a larger dormer, a deeper basement or a moved beam, the work may no longer match what the award allows. A party wall surveyor can tell whether the change needs an addendum award, a fresh notice or nothing at all, and can agree it with the neighbour’s surveyor before your builder goes beyond what has been permitted. The same applies when the neighbour asks for extra work or the programme has slipped. The Act applies in England and Wales.

How a professional can help

Spotting changes that need agreement: Comparing the revised drawings and structural design with the original award, to show which changes sit within it and which add work, depth or load next door that the award does not cover.
Addendum awards: Where the work changes but the original notice still fits, the surveyors can make a further award that records the change, so the whole job stays under one set of agreed terms.
Fresh notices where they are needed: If the change brings in a new kind of work, such as digging not mentioned before, a new notice may have to be served and its notice period allowed to run before that part starts.
Extra work the neighbour asks for: A neighbour may want something done while the wall is exposed, such as a repair on their side. The surveyors can record what is agreed and who pays for it.
Delays and lapsed notices: If the start has slipped or work has stopped, a surveyor can check whether the notice and award still fit, and what to agree with the neighbour’s surveyor before your builder returns.
Keeping the builder in step: Explaining in plain terms what the award allows, so the site team does not move a beam, deepen a trench or change a sequence without raising it with the surveyor first.

Is this right for you?

Your designer or engineer has revised the drawings since the notice was served.
Your builder has found something on site, such as a different wall construction, that changes the method.
The neighbour has asked for extra work to their side while the works are under way.
Months have passed since the notice or award and you are still not ready to start.

How the project usually runs

Compare old and new: Your surveyor sets the revised drawings, method statement and programme against the existing notice and award, and lists each difference that touches the shared wall, the foundations or the neighbour’s property.
Decide the route: Small changes may be covered by the existing award. Others call for an addendum award or a fresh notice. The surveyor explains which applies and what notice period, if any, has to run.
Agree it with the other side: The surveyors discuss the change with the neighbour’s surveyor, and the neighbour if needed, then record what has been agreed, including any new protection, monitoring or access arrangements.
Addendum signed and served: The addendum award is signed by the surveyors and served on both owners. It sits alongside the original award, and your builder is given the updated terms to work to.
Work proceeds and is checked: The work follows the amended terms. The schedule of condition and the final inspection take account of any extra areas, so later questions can be judged on a complete record.

What affects the cost

How many changes there are, and whether each is minor or alters the structural design.
Whether an addendum award is enough or a fresh notice, with its own notice period, is needed.
Whether the neighbour agrees quickly or the surveyors have to settle differences.
Whether extra inspections, an updated schedule of condition or more monitoring is needed.
The surveyors’ time for reviewing the original paperwork and checking the revised design.

Awards, notices and other approvals

Awards come from the Party Wall etc. Act 1996, which covers England and Wales only. Scotland and Northern Ireland have different rules, and party wall surveyors work across the UK.
An award is tied to the work and the notice it was made under, so a notice served long ago may need checking again before work starts. Your surveyor can advise.
A design change may also need an amended planning decision or Building Regulations submission. Both are separate from the award, and the rules differ across England, Scotland, Wales and Northern Ireland.
Do not let a builder go beyond the award’s description. Work outside it is not covered, so raise changes with your surveyor first.

Questions people ask

What is an addendum award?

It is a further award, made by the surveyors, that records a change to the work after the original award was served. It sits alongside the first award rather than replacing it, and both owners receive a copy. Your surveyor can say whether your change needs one.

Do I always need a new award if my plans change?

No. A small change that stays within what the award describes may need nothing new, and some changes only need a conversation between the surveyors. A change that adds work to the shared wall or alters how the work affects next door usually does. Ask your surveyor before the builder acts.

Can my neighbour ask for extra work to be added?

In some cases, yes. The Act allows an adjoining owner to ask for additional work, and the surveyors record who carries it out and who pays. Requests like this should be agreed in writing before the building owner’s builder acts on them.

What if my start date has been delayed for months?

Notices do not last indefinitely. If work has not started within a set period after the notice was served, it may lapse, which can affect an award made under it. Tell your surveyor as early as you can so they can check the position and, if needed, arrange a fresh notice.

Will changing the award delay my project?

It can, if the change needs a new notice period or the neighbour’s surveyor needs time to review it. Small amendments are often quick. Raising a change early, before the builder reaches that part of the work, gives the most time to resolve it without a stoppage.

Available across the UK

Party wall surveyors cover the whole of the UK. The Party Wall etc. Act 1996 applies in England and Wales; Scotland and Northern Ireland have different rules, and a professional can tell you what applies to your property.