Party Wall Services. Handled by Professional Surveyors.
The difference is simple: one impartial surveyor acts for both owners, or each owner appoints their own. The Agreed Surveyor route is usually cheaper and faster; two surveyors give each side their own representation.
Both routes follow the same Act, reach the same kind of Party Wall Award, and protect both owners equally. What changes is cost, speed and representation, so the right choice depends on how comfortable both sides are with a single appointment.
The difference is the number of surveyors, not the level of protection. With an Agreed Surveyor, both owners appoint a single, impartial surveyor who acts fairly for both under Section 10(1)(a) of the Party Wall etc. Act 1996. With two surveyors, each owner appoints their own under Section 10(1)(b), and the two work together to agree the Award, selecting a Third Surveyor at the outset as a backstop.
Neither route is better in the abstract. The Agreed Surveyor gives one appointment, one set of fees and one line of communication, which is why it is usually quicker and cheaper. Two surveyors give each owner their own representative looking solely at their interests, which reassures some Adjoining Owners on larger or sensitive projects.
The choice comes down to a handful of practical differences. Both routes end in a binding Award; only the path differs.
| Agreed Surveyor | Two Surveyors | |
|---|---|---|
| Number of surveyors | One, for both owners | One each |
| Cost | Lower, one fee | Higher, two fees |
| Speed | Usually faster | A little longer |
| Representation | Impartial, for both | Each owner has their own |
| Third Surveyor | Not appointed | Selected at the outset |
| Best where | Neighbours on reasonable terms | Either side wants their own |
Most London projects fit one side or the other clearly.
Yes, to a degree. If you start with an Agreed Surveyor and one owner later loses confidence, that owner can appoint their own surveyor, which moves you onto the two-surveyor route. The reverse is harder once two are appointed.
Switching adds cost and time, so it is worth getting the choice right at the start. In practice, most projects that begin with an Agreed Surveyor stay with one. If you are unsure which route suits your project, a short conversation usually settles it before any appointment is made. Whichever route you take, the Act still requires a surveyor to prepare the Award once a dispute is deemed to have arisen; at LENIO every appointment is led personally by a Chartered Civil and Building Engineer (ICE and CABE).
No. An Agreed Surveyor is impartial by law and acts fairly for both owners, not for the party who suggested them. Their duty is to the correct application of the Act, not to either side. The surveyor cannot favour the Building Owner, even though the Building Owner usually pays the fee.
Yes. Every owner has the right to appoint their own surveyor, which moves the matter onto the two-surveyor route. You cannot require a neighbour to accept an Agreed Surveyor. If they prefer their own, the process still works smoothly; the two surveyors simply agree the Award between them.
In almost all cases, yes, because one appointment means one set of fees rather than two, and it is usually faster as well. The rare exception is a project where a single surveyor takes far longer than two working in parallel. For most London projects, the Agreed Surveyor route is the cheaper choice.
An owner who loses confidence in the Agreed Surveyor can appoint their own surveyor instead, which moves the matter onto the two-surveyor route, with a Third Surveyor available if needed. This is uncommon, because an Agreed Surveyor is chosen jointly at the outset. The option exists as a safeguard.
Yes, fully. The Agreed Surveyor must protect the Adjoining Owner's property just as a separately appointed surveyor would, including a Schedule of Condition and clear conditions in the Award. Impartial does not mean weaker; the same protections apply, prepared by one surveyor instead of two.
No. A Third Surveyor is only selected where two surveyors are appointed, as a backstop if they disagree. With a single Agreed Surveyor there is no one to disagree with, so no Third Surveyor is needed. This is part of why the route is simpler and quicker.
Tell us about your project and a LENIO chartered surveyor will explain which route fits, with free initial advice and no obligation.
