Party wall matters that are not planning matters

Your neighbour can object to your planning application on party wall grounds and the council will ignore it, because the Party Wall etc. Act 1996 and the planning system are separate regimes with separate decision makers. The party wall question is whether you may carry out work to a shared structure or near your neighbour's foundations, and how any damage is dealt with. Planning is a public interest judgement about land use and appearance. One does not decide the other, and satisfying one gives you nothing in the other.

Both usually apply to the same rear extension, so the answer is to run them in parallel and understand which conversation you are having.

What the 1996 Act covers

Three types of work bring the Act into play.

Building on the line of junction, meaning a new wall at or astride the boundary, is covered by section 1. Work to a party structure is covered by section 2, and that section is broader than most homeowners expect: cutting into a party wall to take a beam, raising or underpinning it, removing a chimney breast, inserting a damp proof course, and demolishing and rebuilding all fall within it.

Section 6 is the one people miss. It applies where you excavate within three metres of a neighbouring building or structure and to a lower level than its foundations, and also where you excavate within six metres and a line drawn downwards at 45 degrees from the bottom of the neighbour's foundation would meet your excavation. Ordinary extension foundations on a terraced or semi-detached street frequently trigger it.

The Act gives you rights as well as duties. It authorises work that would otherwise be trespass or a nuisance, provided the procedure is followed, and it gives a route of access to carry out the work.

Notices, awards and surveyors

The procedure is a sequence, and the notice periods differ.

The neighbour may consent in writing, or dissent. If they do not reply within 14 days to a section 2 or section 6 notice, they are treated as having dissented and a dispute exists, whether or not anyone is actually arguing.

Once a dispute exists, surveyors are appointed. A single agreed surveyor costs less and is usually the better route. Otherwise each owner appoints their own, and those two select a third surveyor who resolves any disagreement between them. The surveyors produce an award, which is a binding document recording the work permitted, the conditions attached to it, a schedule of the neighbour's property condition before work starts, and an allocation of who pays for what. An award can be appealed to the county court within 14 days.

A schedule of condition with photographs is the single most valuable part of the process for both parties. It converts an argument about whether a crack is new into a document.

Why the council will not enforce it

Planning officers have no power under the 1996 Act. It is civil legislation between neighbouring owners, enforced through the surveyors' award and ultimately the courts.

That means a council cannot refuse permission because you have not served notices, cannot require the award as a condition, and cannot help your neighbour if you start work without following the procedure. Nor is the reverse true: an award does not authorise development that needs planning permission.

Private property matters of this kind are generally not material considerations in a planning decision. Boundary disputes, restrictive covenants, rights of way over private land and party wall obligations all sit outside the planning judgement, which is why they carry no weight however strongly they are put.

Party wall points raised as planning objections

Neighbours raise them anyway, and case officers see the same handful every week. Worries about the shared wall cracking, about foundations undermining a garage, about access for scaffolding, about whether a chimney breast can be removed.

The useful response is not to dismiss them in your planning statement. Say briefly that the works engage the 1996 Act, that notices will be served and an award obtained, and that structural matters will be designed and approved under building regulations. That reassures the officer, addresses the neighbour's real concern in the right forum, and keeps the planning submission focused on the matters the council can weigh.

What officers can consider, and often do, are the planning consequences that sit next to a party wall issue. Loss of light to a habitable room window, overbearing effect from a two storey flank wall, and the effect of a boundary structure on outlook are all planning matters. The 45 degree line officers use for daylight assessment is a different 45 degree line from the one in section 6 of the Act, and confusing the two is common.

Sequencing notices against the application

Serve party wall notices when the design is settled, which usually means after planning permission is granted and once the structural design is far enough advanced to describe the works accurately.

Serving too early causes problems. A notice describes particular works, and if the design changes at planning stage or at building regulations stage, the notice and any award may no longer cover what you intend to build, and the process restarts.

1. Obtain planning permission, or confirm the works are permitted development.
2. Complete the structural design far enough to describe foundations, beams and any work to the shared wall.
3. Serve the correct notices, and allow for the statutory period plus time for surveyors to be appointed and an award to be prepared.
4. Agree the schedule of condition and any monitoring before the contractor starts.
5. Keep the award, the schedule and any monitoring records with the project papers.

Allow two to three months from notice to award on a straightforward domestic case where surveyors are appointed, and longer where the neighbour is slow to appoint. That sits comfortably inside a normal build programme if it starts early, and it is the classic cause of a delayed start when it does not.

Excavation near a neighbour

Excavation cases raise the most technical issues, particularly where a basement or a deep foundation is involved. A Structural Survey of both properties informs the design, and the neighbour's surveyor will expect to see foundation details, a temporary works approach and a monitoring proposal.

Where the excavation is a basement rather than a foundation trench, planning and party wall requirements start to overlap in substance even though they remain separate in law. Many authorities require a Basement Impact Assessment, and the ground movement predictions in it are the same predictions the party wall surveyors will want. Setting up one monitoring regime that satisfies the planning condition and the award saves paying for two. Retention of existing structure changes the sequence again, as the note on retaining existing structure rather than demolishing explains.

Costs and who pays

The general position is that the building owner, the person doing the work, pays. That covers both surveyors' fees where two are appointed, the third surveyor if called upon, and the cost of making good any damage.

There are exceptions. Where work benefits both owners, such as repair of a defective shared wall, costs can be apportioned. Where an adjoining owner asks for additional work for their own benefit, they pay for that element. And an adjoining owner who appoints a surveyor and then behaves unreasonably may find the award deals with fees differently.

Section 12 allows an adjoining owner to request security for expenses before work begins, which is more common on basement projects than on extensions. Budget for the party wall process as a line item rather than a surprise.

To see which documents your project needs for the planning side, browse the planning report types and start a draft.

This is general guidance, not legal advice. Check the position with a party wall surveyor, your local planning authority or another qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.