10 Questions London Homeowners Ask Before Building Work Begins

Despite their fun sounding name, Party Walls can in fact be no fun at all.

But if you’re a homeowner in London planning renovations, extensions, or work near your property boundary, understanding Party Walls is essential. The Party Wall etc. Act 1996 sets out the legal requirements for shared walls, boundaries, and nearby excavations.

In this guide, we answer the 10 most common questions London homeowners ask about Party Walls, helping you navigate the process confidently and avoid disputes.

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Why London Is the Same, but Different

You might be curious as to why we talk about London specifically.

While the Party Wall etc. Act 1996 applies throughout England and Wales, there are many significant practical differences due to the capital’s unique housing situation.

Complex Ownership

In areas with dense housing, renovation projects can become more complicated because there are often multiple property owners, such as freeholders and leaseholders. This can increase both administration time and costs.

It’s also important to remember that the person living next door may not be the legal owner of the property. If they are renting, you will need to identify and serve notice on the actual owner, not just the occupant.

Basement Excavations

With numerous basement conversions in London, certain sections of the Act become more complex, posing higher risks of structural damage and leading to increased expenses for detailed Party Wall Awards and surveyor fees.

Surveyor Costs

Party Wall Surveyors in London can often charge higher fees due to the complexity of projects, resulting in overall higher costs for building owners.

Density and Access

London is primarily made up of terraced and semi-detached Victorian and Edwardian properties with little space between them.

The Act grants the building owner the right to access the adjoining owner’s land to carry out necessary works. In London, this can not only be an inconvenience, but an absolute necessity, for example to erect scaffolding, apply flashing, or inspect foundations.

The impact of this is that access is almost always a condition detailed in the Party Wall Award, often requiring additional compensation payments for the space occupied. This is less common for detached properties elsewhere in the UK.

1. When Do I Need to Serve a Party Wall Notice?

Typically, a Party Wall Notice should be arranged two months prior to commencing construction on your project. However, for excavation work or the construction of a new wall along the boundary line, the notice period is one month.

Regardless of the type of work, we advise initiating this process sooner rather than later. As you progress toward the construction phase, the last thing you want is an unresolved Party Wall procedure, a delayed Party Wall Award, or improperly issued notices holding up your project.

2. Who Pays for the Party Wall Surveyor(s)?

Unsurprisingly, one of the most frequently searched questions regarding Party Walls is, “Who foots the bill?”

Typically, the building owner planning the construction will cover all costs related to drafting the Party Wall Agreement, including the fees for the surveyor(s).

As the building owner, you have the option to appoint a single impartial surveyor to represent both you and your neighbour, known as an Agreed Surveyor. Alternatively, each party can appoint their own surveyor. In either case, the building owner is generally responsible for the Party Wall survey fees.

3. What Is a ‘Deemed Dissent’ and What Happens if My Neighbour Ignores the Notice?

If your neighbour does not reply to your Party Wall Notice within the 14-day period, it is legally considered a “deemed dissent” and the following process takes effect.

1. A dispute is created

The lack of response within 14 days automatically triggers a formal dispute under the Party Wall etc. Act 1996.

2. Surveyor appointment

Both parties must appoint a surveyor. If the neighbour fails to appoint one within 10 days of a follow-up request, the building owner can appoint a surveyor on their behalf.

3. Party Wall Award is made

The appointed surveyors work together to create a legally binding document called a Party Wall Award.

This Award details the work to be done and sets out agreed safeguards, such as working hours, dust control, and measures to limit vibration.

4. Work can proceed

Once the Award is agreed upon and served, the building owner can begin the works legally, provided there is no appeal to the county court within 14 days of the Award being served.

Top Tip

Whenever possible, engage your neighbour early to discuss your plans informally before serving formal notice. Sharing sketches or keeping them informed about potential disruptions can lead to smoother interactions and help prevent disputes further down the line.

4. What Is the Difference Between an ‘Agreed Surveyor’ and Two Separate Surveyors?

Under the Party Wall etc. Act 1996, when a dispute arises, the parties can either agree on one surveyor, known as an Agreed Surveyor, or each appoint their own surveyor.

Agreed Surveyor

Both the building owner and the neighbour choose one impartial surveyor to act for them both.

This surveyor prepares the Party Wall Award and ensures that the work is carried out fairly and according to the law.

This option is usually quicker and less expensive, as only one surveyor is involved. However, both parties must agree to this arrangement.

Two Separate Surveyors

Each party appoints their own surveyor. The two surveyors then work together to prepare the Party Wall Award.

If they cannot agree, a third surveyor, selected in advance, may be called upon to make a final decision.

This option provides each party with independent advice but can take longer and may cost more.

5. What Is a ‘Schedule of Condition’ and Is It Mandatory?

A Schedule of Condition is a detailed record of the current state of a property before any construction or renovation work starts.

It can include written descriptions and photographs of walls, floors, roofs, and other features.

The main purpose is to protect both parties.

It provides a clear record of the property’s condition before work begins, so any change or damage can be identified with confidence. It also helps protect the building owner carrying out the work by reducing the risk of unclear or unfounded claims.

Is it mandatory?

No. A Schedule of Condition is not legally required under the Party Wall etc. Act 1996, but it is highly recommended as it helps prevent disputes and clarify responsibility if damage occurs.

6. Does a Party Wall Notice Expire?

Yes. A Party Wall Notice is valid for 12 months from the date it is served.

This gives you time to plan and start your work. If your project has not begun within that period, the notice will expire and a new notice must be issued before works proceed.

Please note, the works do not need to be completed within the 12-month window.

7. Can My Neighbour Actually Stop My Building Work?

Even if your neighbour dissents or ignores your Party Wall Notice, the Act is there to enable works to proceed within reason.

For example, the Act cannot allow someone to build on another person’s land without permission.

As long as your project is lawful and follows the Party Wall etc. Act 1996, the work can proceed.

Your neighbour can, however, raise concerns regarding how and when the work is carried out. For example, they may request restrictions on working hours or suggest less disruptive construction methods.

This is where Party Wall Surveyor(s) step in to help facilitate a fair solution.

8. Is a Party Wall Award Needed for a Loft Conversion or Basement Excavation?

In short, the answer is yes, almost always.

This is because both projects involve notifiable works that typically result in a statutory dispute.

A Party Wall Award is commonly required for a loft conversion because the work usually involves actions that directly affect the shared wall or Party Structure.

A Party Wall Award is virtually guaranteed to be required for a basement excavation due to the depth of the new foundations. Excavating for a basement will almost always be deeper than the neighbour’s existing foundations and within three metres of their property, making it notifiable under Section 6 of the Act.

9. What Are the Consequences if I Start Work Without a Party Wall Award?

When project timings are tight, the temptation may be to “act now and apologise later”.

However, although failing to obtain a Party Wall Agreement is not technically a criminal offence, skipping the process can create serious complications.

Without the proper notice or agreement in place, a neighbour may claim your work caused damage to their property. Without a formal record of the previous condition, you may have little evidence to defend against those claims.

Courts also tend to take a poor view of owners who ignore the notice process. This can result in liability for repairs, legal costs, or even an injunction that temporarily stops the project until a Party Wall Agreement is in place.

This can lead to delays, additional costs, and avoidable stress.

In short, it is always safer to serve notice correctly, follow the legal process, and ensure the project remains compliant.

10. Where Can I Find a Party Wall Surveyor?

When appointing a Party Wall Surveyor, a key risk is using someone without proper accreditation or professional oversight.

Without recognised professional accreditation, there is a higher chance of inconsistent advice, errors in notices, or poorly drafted Party Wall Awards. This can lead to delays and disputes between neighbours.

Accredited surveyors also follow strict codes of conduct and are expected to carry professional indemnity insurance. This provides a clear complaints process and financial protection if something goes wrong.

Checking accreditation early helps reduce risk and keeps the process more reliable for both parties.

• RICS Find a Surveyor – Party Walls
• Faculty of Party Wall Surveyors

Disclaimer

This guide is for informational purposes only and does not constitute professional or legal advice.

The information provided is not an authoritative interpretation of the law and should not be relied upon as such. It is not a substitute for the Party Wall etc. Act 1996 or any other relevant legislation.

For official guidance and further information, please visit the UK Government website on Party Wall matters:

www.gov.uk/party-walls-building-works