Third Wheel: Do I really need a ‘Third’ Party Wall Surveyor?

Last Updated: September 29, 2026

Table of Contents

‘Third’ Party Wall Surveyors

This article is aimed at property owners and their adjoining owners when there is a dispute in a Surrey or London construction project. It concerns the selection of a third surveyor to help resolve disputed matters if the two appointed surveyors cannot agree.

  • It is a common practice and can help prevent the process from stalling.

The need for a third surveyor creates significant confusion under Party Wall law.

The Building Owner and Adjoining Owner may agree to use one surveyor. If they appoint separate surveyors instead, those two surveyors must select a third surveyor. See section 10 of the Act.

When two surveyors are appointed, who can help if they cannot agree? This is when the selected third surveyor may be called upon. The Party Wall Act requires the two appointed surveyors to select one at the outset.

All three surveyors are referred to in the Act as “the three surveyors.”

Why involve more Surveyors?

It is the law. The Third Surveyor is usually a largely silent role. Either owner or either appointed surveyor may call upon them to determine disputed matters.

Example situations include:

  1. Either of the surveyors or either of the parties to a dispute calls upon the third surveyor to determine an outstanding matter. The third surveyor then makes the necessary award.
  2. The two surveyors disagree on a technical, legal or procedural issue. Either surveyor can refer that issue to the third surveyor. The building owner or adjoining owner can also call upon the third surveyor to determine a disputed matter.

Who pays the fees?

It is a common misunderstanding among Building Owners that they have to foot the bill for any third surveyor involvement simply because it is their build. Selecting a third surveyor does not usually result in a fee if they are not called upon to act. If they make an award, the reasonable costs are allocated as the surveyor or surveyors making the award determine. The party who referred the matter is not automatically responsible for the entire bill.

Therefore, the Building Owner and the Adjoining Owner should understand the possible costs before referring a matter to the third surveyor. Section 10 also addresses how reasonable costs are allocated.

For a closer look at potential fees, review the party wall surveyor cost guide before making a referral.

Reality

In many cases that Westville Associates deal with, the owners use an agreed surveyor. When each party appoints their own surveyor, those surveyors must select a third. However, the third surveyor is often never called upon to determine a matter, so their selection does not usually add a fee.

  • A third surveyor is selected even when the two appointed surveyors expect to resolve matters themselves.

If you are the Building Owner or Adjoining Owner, Westville’s guidance on party wall disputes explains the wider process.

Next Step

If you have a specific third surveyor question about a Surrey or London project, send Simon the details or call 07834 761 411.

Our Lead Surveyor

Simon Burrage surveyor

While I specialise in building surveys and party wall work, I can also assist with a range of other survey services. I work with Architects, homeowners, and Landlords across Surrey and London. I have over 10 years of experience and have many clients who have been using me for years. I look forward to meeting new clients and am passionate about helping them solve any issues their new property may have.

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Chris Thoume
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Great experience working with Simon: he took me through the process in simple terms and was always willing to provide considered pragmatic advice.
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Jessica Sanzone
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Would highly recommend using Westville Associates. Appointed Brett to act for us in regards to some party wall matters. We found him to be polite and professional with a wealth of knowledge in this field. Great communication throughout the process. Great service from start to finish.
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Kate Rennie
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I was recommended to use Westville Associates through a colleague to carry out a survey of a house we were looking to purchase. I couldn’t have been happier with the whole process. From start to finish, Simon was professional, punctual, through and gave good advice with issues that arose from the survey. I have and will continue to recommend Westville Associates to anyone wishing to carry out any surveys.
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Niki Yazdanian
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Simon carried out a full building survey for us on a property in Oxted. We found him to be prompt, professional, very knowledgeable, a great service all round. We would have no hesitation in recommending him and using him again.
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Really recommend Westville, great communication and advice. Clear, concise and quick report and more than happy to discuss any points to help us understand our purchase better.
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Sara Mahdavian
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We used Wesville Associates for a full Building Survey for our property in Claygate after a recommendation from a friend. Simon was very personable, knowledgable and professional, and was able to work around our tight timeframe. We felt in good hands from the start!
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“Westville Associates undertook a homebuyers report for us prior to the purchase of our flat in Wandsworth. The service from start to finish was exemplary. Simon booked us in, undertook the inspection and presented the report to us all within 7 working days which was appreciated as time was against us somewhat. The after sales care was also great as we had several questions about the property that were dealt with over the phone. Friendly, professional and prompt service. Would definitely recommend. Rob.”
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Craig C
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I have worked in Surbiton and the surrounding areas as an agent for over 10 years and could not recommend Simon highly enough. He has a wealth of knowledge and goes above and beyond to ensure his clients fully understand the fantastic reports he creates, unlike many other surveyors who just send a confusing report without further explanation of key points. I am so pleased Simon has set up his solo venture - Westville Associates and will be recommending him to all of my clients.