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Understanding Party Walls and the Party Wall Act

What is party wall?

A party wall is a shared structure between properties, typically the wall separating semi-detached houses or the floors between flats. The Party Wall Act 1996 regulates how these shared structures are managed during construction or renovation work.

What is the Party Wall Act?

The Party Wall etc. Act 1996 is an essential legal safeguard in England and Wales, aimed at fostering cooperation when construction work is planned near shared or adjacent structures. Whether you’re thinking of digging foundations for a home extension, altering a shared wall between semi-detached properties, adding a loft conversion to your home, or even carrying out deep excavations for a basement, this Act could come into play.

It sets out a clear legal process for notifying adjoining property owners of certain types of work that might affect shared walls, boundaries or nearby foundations. These types of work broadly include:

  • Changes to party walls or structures, such as those which separate terraced or semi-detached homes, which can then be divided into flats
  • Excavations within 3m to existing neighbouring foundations
  • New builds on the boundary line

The Act is designed to protect both parties by outlining rights and responsibilities, helping to manage risks like structural damage and access issues, while also allowing work to proceed in a fair and transparent manner.

Types of Work Covered by the Party Wall Act

There are three distinct categories which the Party Wall Act applies to:

New Boundary Walls

The most common new construction is a 1(5) wall, which is built right up to the boundary but not over it. Many Adjoining Owners mistakenly believe walls need to be set back but this isn’t the case. As long as nothing overhangs (e.g., roofs, gutters, fascias), the wall can go up to the boundary without needing your neighbour’s consent.

Less common is the 1(2) wall – this sits 50/50 on each property and does require the Adjoining Owner’s approval. It gives the Building Owner a slightly larger extension and provides the neighbour with a shared wall they can build from in the future, unlike a 1(5) wall.

Work to a Party Wall

There are 14 types of work that fall under this section. They tend to be viewed as more of a risk, since they involve some form of adjustment to the wall itself such as raising, cutting away from or changing the structure. This might include repairing or rebuilding a party wall, underpinning for basement excavations or to strengthen the wall for a loft extension, removing a party wall, or cutting into it for steep beams or waterproof lead flashings.

Excavations

If excavations for foundations are within 3 metres of the neighbouring property, and deeper than the existing foundations, the Act will apply. Most London properties built during the Victorian period or the 1930s have shallow foundations that rarely exceed 30cm. However, to meet current building regulations, they need to be at least 1 metre deep.

What Does the Party Wall Process Involve?

  1. Serving Notice: The Building Owner must serve notice to the Adjoining Owner for any works under the Party Wall Act, usually via a surveyor, at least 2 months before work begins.
  2. Consent or Dissent: The Adjoining Owners has 14 days to respond, either to give consent to the work or dissent. If they dissent, or no response is given, a Party Wall Award will need to be prepared.
  3. Schedule of Condition: Before work begins, a photographic and written record of the Adjoining Owner’s property will need to be drawn up as evidence in case of any later damage.
  4. Party Wall Award: The surveyor provides a legally binding document which details the proposed work, the timeline and any necessary protections. This is issued to both parties, after which work can begin.
  5. Final Inspection: Once complete, the surveyor checks for any signs of damage and if none is found, the matter is closed. If there is damage, the Adjoining Owner can choose the Building Owner’s contractor for repairs or claim compensation to hire a contractor of their choosing.

For a comprehensive understanding of party walls, the Act, and its potential impact on your property plans, we’ve created a detailed guide. Whether you’re planning a home renovation, extension, or new build, our in-depth Party Wall Act guide provides essential information about party walls and your legal obligations.

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Contact us today to talk with our party wall specialist who possess in-depth knowledge of all Party Wall matters, a passion for London properties and the unique challenges of the capital.

 

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About Us

Our surveying services cover Central London and South London and our team of experienced professionals have expert knowledge with the unique character and property landscape of areas.

Central London

Kensington (W8, SW7)
Chelsea (SW3, SW10)
Knightsbridge (SW1X, SW7)
Notting Hill (W11)
Ealing (W5, W13)

South London

Woolwich (SE18)
Brixton (SW2, SW9)
Clapham (SW4, SW11, SW12)
Bermondsey (SE1, SE16)

 

North London

We pride ourselves on delivering comprehensive surveying services across North London’s most sought-after neighbourhoods.

Enfield (EN1, EN2)
Highgate (N6)
Hampstead (NW3)
Islington (N1, EC1V)
Hackney (E8, E9)
Haringey (N4, N8, N15, N17, N22)

Uxbridge and The Suburbs

We also proudly serve clients across the London suburbs, with our conveniently located local office situated in the heart of Uxbridge.

Uxbridge (UB8, UB10)
Hayes (UB3, UB4)
Ruislip (HA4)
Hillingdon (UB10)
West Drayton (UB7)
Ickenham (UB10)

Why choose Squarepoint Surveyors?

Squarepoint Surveyors are a team of experienced RICS Chartered Surveyors and party wall surveyors operating in London and the surrounding regions. We are members of the Faculty of Party Wall Surveyors (FPWS) and the Pyramus and Thisbe Society.

We provide the advice and guidance you need on any party wall-related matter, whether you are a Building Owner looking to carry out work, or an Adjoining Owner who has been served with a party wall notice. Our experienced surveyors ensure that they are up to date with the latest case law and industry best practices.

We work with both residential and commercial clients across a wide range of London boroughs. Each of these areas features distinct property types, and the application of the Party Wall Act can vary accordingly. For example:

Hackney & Haringey: Predominantly Victorian and Edwardian terraced housing, where shared walls are common. Loft conversions, rear extensions and basement digs often trigger Party Wall Act notices due to proximity to neighbouring properties.

Highgate: A mix of period homes and larger detached properties are found here. While some developments might not directly impact shared structures, excavation near boundaries or works affecting garden walls can still require notice.

Notting Hill, Chelsea & Knightsbridge: Renowned for its high-value properties and listed buildings, works like basement extensions, structural alterations, or internal layout changes in converted townhouses frequently invoke the Party Wall Act.

Uxbridge & Enfield: These outer boroughs feature a mix of post-war semi-detached properties, new builds and commercial units. Common party wall scenarios include side extensions and redevelopment of mixed-use sites.

With many years’ experience in the London property market, we have the necessary expertise to help you manage this often complex party wall process from start to finish, guiding you safely throughout. We also provide a no obligation and free review service for architects, engineers or developers who require advice in the early stage of any project or development scheme.

For further information and expert party wall advice, please get in touch with our highly knowledgeable and experienced team today.

Party Wall FAQs

What is a party wall survey?

A Party Wall Survey consists of the work carried out by our professional party wall surveyors, acting on behalf of a Building Owner or an Adjoining Owner. We would typically inspect the party wall or structure and its position in relation to all adjoining properties, to understand if the proposed works are going to affect the party wall or the surrounding area, as well as providing impartial advice and guidance. Our party wall surveyors may also be called upon to help with the preparation and administration of a party wall award, under the Party Wall Act 1996.

Who is my Adjoining Owner?

Your Adjoining Owner is anyone who has an interest greater than a year-to-year tenancy in the neighbouring property that will be affected by party wall work. This could be an owner occupier, a leasehold owner or long-term tenant. In the case of the latter two, you will also need to notify their landlord/freeholder. Adjoining properties could be neighbouring semi-detached or terraced houses, but they could also be flats or maisonettes in a building, where a party wall might be a shared wall, floor or ceiling.

How do I notify the Adjoining Owner(s)?

You will need to provide a detailed plan of your proposed works, including the project schedule and how it will affect the neighbouring property. Clearly state that you are serving Notice under the provisions of the Act, and include your name, address and address of the building project. The Notice can be delivered in person or by post, at least 2 months prior to your proposed start date. Aim to discuss your construction plans with your neighbours informally before you give Notice, so that any potential issues can be negotiated beforehand, and they feel more comfortable providing consent.

What happens after a Party Wall Notice has been served?

After you or your surveyor has served Notice, your Adjoining Owner(s) must respond with their written consent within 14 days if they are happy with your plans. If they wish for any changes to be made to your plans, then they will need to provide you with a Counter-Notice requesting these amendments. Where consent has not been given in the 14 days following Notice being served, the parties are considered to be in a party wall dispute, and one or several party wall surveyors must be appointed to prepare a Party Wall Award.

What happens if the Adjoining Owner does not consent to the works?

When an Adjoining Owner is not satisfied with the proposed works, having been served Notice, and chooses not to provide their written consent, a party wall dispute arises. Both parties are now entitled to seek professional arbitration through a party wall surveyor. This may be the same surveyor (known as an ‘agreed surveyor’), or separately appointed surveyors for the Building Owner and Adjoining Owner(s). The surveyor(s) then impartially negotiate the terms between the affected parties and draw up a Party Wall Award.

What does a Party Wall Award cover?

A Party Wall Award states the work that will be carried out and the agreed terms of it being conducted. The Award also includes a Schedule of Condition, documenting the current state of the adjoining property so that any damage can be identified and made good upon completion of the works. It should be noted that Adjoining Owners ultimately cannot prevent the work from happening by denying access for contractors or surveyors. However, the Building Owner must provide appropriate Notice (typically 14 days) to the occupier and Adjoining Owner, unless it’s an emergency.

How can I dispute a Party Wall Award?

According to the Party Wall Act 1996, a Party Wall Award should facilitate the resolution of any dispute between adjoining neighbours in relation to building works carried to a shared wall or structure. However, should either party object to its terms, they have 14 days from the date the Award is finalised in which to appeal it at the County Court. Be aware that if your appeal is overturned, you may be liable for the other owner’s costs as well as any costs resulting from delays to the building work.

Is it possible to retrospectively serve Notice or agree on completed works?

In short, no. If no Party Wall Notice is served as per the Act, no consent can be given, and any works carried out will be outside of the law. Sometimes, this situation arises in error – Building Owners did not realise their work would be covered, or the scope of the project has had to change after work has started. If an Adjoining Owner was not given the opportunity to dissent to works they may apply for an injunction to stop further activity. They may also claim against the Building Owner for any damages that may have occurred as a result of the works.

What can I do about my neighbour building without having served Notice on me?

If you have not been served a Party Wall Notice by your neighbour prior to building works commencing next door, your neighbour is acting illegally and you have the right to stop the work from continuing. Apply for an injunction from the County Court where you will most likely be required to provide a cross-undertaking in costs. This means you will be liable for any costs incurred as a result of the injunction if your neighbour is found to be acting within the law. Seeking legal advice before applying for an injunction is advisable.

What should I do if I started building without serving the required Notice?

If you have commenced building works that are notifiable under the Party Wall Act and you have not served Notice on, or obtained consent from, affected Adjoining Owners, you are acting outside of the law and could be prosecuted. If you are part way through your project, you should stop all building activity with immediate effect, serve Notice to cover the remainder of the work and follow the process as per the Act. Any dissents should be dealt with by appointed surveyors according to Section 10 of the Act.

What can I do about construction noise coming from next door?

While Adjoining Owners are expected to tolerate ‘reasonable disturbance’, the Building Owner has the responsibility to carry out their alterations without causing undue inconvenience. The Building Owner must comply with normal health and safety legislation and environmental protection laws, including keeping noise and vibrations within local limits and working within time restrictions. However, if you suffer a quantifiable loss as a consequence of the notifiable works being carried out, you will be able to claim compensation.

Who pays for a party wall surveyor?

As a general rule, the Building Owner is liable for all reasonable costs associated with the preparation of a Party Wall Award. This includes all surveyor costs, including the Building Owner’s surveyor, the ‘agreed’ party wall surveyor or individual party wall surveyors appointed separately by Adjoining Owners. It is therefore in the Building Owner’s financial interest to make the entire process run as smoothly as possible, since any party wall disputes or building delays will incur additional work and costs.

How long do Party Wall Survey procedures take?

A Party Wall Award should take in the region of 4-6 weeks to finalise, provided the Building Owner has all the drawings and details ready, the Adjoining Owner is cooperative and an agreed surveyor is appointed. However, where multiple Adjoining Owners are involved, and each party appoints their own surveyor, the process will be slower. Significant delays can occur in cases where there is disagreement between the surveyors and a third party wall surveyor becomes involved in order to come to a decision and make the Award.

Our Party Wall Guide

The Squarepoint Party Wall Guide is essential reading for anyone who owns or lives in a property that shares a party wall with another property. Topics include:

What is a Party Wall?

What is the Party Wall Act?

What is a Party Wall Notice?

What is a Party Wall Dispute?

What is a Party Wall Award?

When Do You Need a Party Wall Surveyor?

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