Party wall matters are one of those areas where doing the right thing early saves you significant time, money, and neighbour relations later. Here's a plain-English guide to party wall surveyors in South and Central London.
What is the Party Wall Act?
The Party Wall etc. Act 1996 is the law that governs works to shared walls, boundaries, and excavations near neighbouring properties. It applies throughout England and Wales.
If you're planning works that fall within the Act's scope — which covers more situations than most people realise — you are legally required to notify your neighbours before starting. Failure to do so can result in injunctions, legal costs, and serious damage to neighbourly relations.
Which works trigger the Party Wall Act?
The Act applies to three main categories of work:
- Party structure notices — works to a shared wall (party wall), including cutting into it, raising it, or underpinning it
- Line of junction notices — building a new wall at or astride the boundary with a neighbouring property
- Three-metre and six-metre notices — excavation within three metres of a neighbouring building to a depth below its foundations, or within six metres where the excavation would intersect a 45-degree plane drawn from the bottom of the neighbour's foundations
In practice, this catches a very wide range of common works in South East London: rear extensions, side extensions, loft conversions, basement conversions, and sometimes even significant internal structural works.
What does a party wall surveyor actually do?
A party wall surveyor's primary role is to administer the Act — ensuring both parties' interests are properly protected. This includes:
- Advising on whether the Act applies to your proposed works
- Preparing and serving the required notices
- Preparing a Schedule of Condition of the neighbouring property (before works begin)
- Preparing or agreeing a Party Wall Award — the formal document that sets out how the works will be carried out, protects both parties, and establishes a process for dealing with any damage
- Assessing any damage to the neighbouring property after works complete
💡 A party wall surveyor is not there to stop your works — their job is to facilitate them properly and protect both sides in the process.
How are party wall surveyors appointed?
There are two main routes:
- Agreed surveyor — both the building owner and the adjoining owner agree to appoint a single surveyor who acts impartially for both. This is simpler and cheaper.
- Two surveyors — each party appoints their own surveyor. The two surveyors then agree the party wall award between them. If they cannot agree, they appoint a third surveyor to determine the matter.
Who pays for the party wall surveyor?
In most cases, the building owner (the person carrying out the works) pays the party wall surveyor's fees — including the adjoining owner's surveyor if separate surveyors have been appointed. This is a cost that should be factored into your project budget from the outset.
How far in advance do I need to serve notice?
The Act sets minimum notice periods:
- Party structure notices — at least two months before works begin
- Line of junction notices — at least one month before works begin
- Three/six-metre excavation notices — at least one month before works begin
Given that agreeing a party wall award can take time — especially if the neighbouring owner appoints their own surveyor — it's wise to start the process as early as possible, ideally when you're still in the planning and design stage.
📋 SurveyCORE provides party wall advice and structural assessments across South and Central London. Get in touch early — the sooner you start the process, the smoother it goes.