Party Wall Conversation Preparation Checklist

Walk the whole boundary and write down every structure that touches, supports or is built against a neighbouring property, including garden walls, outbuildings, steps and floors.

Owners tend to think only of the main wall between two houses, while garden walls, garage flanks and floors between flats raise the same questions.

Note anything visible that suggests the wall serves the neighbouring property too, such as a fireplace, a flue, a vent, a joist end or something fixed from the other side.

These signs are observable by you and are exactly what an adviser will ask about first.

Whether a structure is shared, and what that means for your work, cannot be settled by looking at it; ask a suitably qualified adviser and confirm locally what applies.

Photograph both faces of the structure wherever you can see them from your own land, including the roof line, the ground line and anything fixed to either side.

Photographs of the far side are usually possible from your own garden or an upstairs window, and they become impossible once work begins.

Write in plain words whether your work would touch the shared structure, cut into it, be built against it, go beneath it or simply come close to it.

The distinction between touching, cutting and merely approaching is the first thing anyone advising you will want, and owners rarely state it clearly.

Write down what you are assuming and label each assumption plainly, particularly anything about where the boundary runs or who put a structure there originally.

Assumptions that are never labelled harden into stated facts as a project passes between people.

Keep on the list anything sitting partly on each side, such as a shared drive, a boundary fence, a garage wall or a threshold, even where you believe it is yours.

The structures people are most confident about are the ones that most often turn out to involve somebody else.

Write down every property that adjoins the structure, including any above, below or behind it, rather than only the house immediately next door.

Flats, rear extensions and back-to-back arrangements mean several properties can adjoin the same structure without being obvious from the street.

Note whether each adjoining property appears to be lived in by an owner or a tenant, and treat that as something to confirm rather than something you have concluded.

Speaking only to an occupier can mean the person who actually has an interest in the wall never hears about the work at all.

Ask a suitably qualified adviser how ownership is normally established where a property is let, empty, jointly held or in the name of a company.

There are ordinary routes for this, and guessing or knocking repeatedly is not one of them.

How ownership is established and who has to be approached varies by area and by property; take this to a suitably qualified adviser rather than working it out yourself.

Note whether a landlord, a freeholder or a management company appears to be involved anywhere, since more than one person may hold an interest in the same structure.

Where several interests exist, missing one of them is the usual cause of a project stopping after it has started.

Record contact details as you obtain them, with the date and where each came from, and keep them together in one place rather than scattered through messages.

You will be asked for this list, and reassembling it later from memory is far harder than keeping it as you go.

Ask what is normally done where an adjoining property appears to be empty or where nobody responds at all, and write down what you are told.

Owners often assume an empty property makes things simpler, which is generally the opposite of the case.

Do not treat an unoccupied or unresponsive neighbouring property as one that can be ignored; ask a suitably qualified adviser what applies in that situation.

Write a short plain description of the work, saying what changes, what touches the shared structure and what would happen outside where they would see it.

Anything you have written down calmly beforehand is better than what you will say on a doorstep with no notice.

Keep technical terms and drawing references out of the first description, and offer to show drawings in person rather than sending them without explanation.

Drawings handed over cold are read as a fait accompli, while the same drawings explained across a table rarely are.

Say plainly which parts of the work are still unsettled, rather than filling the gaps with reassurance you may not be able to keep to.

A neighbour who is told something confidently and then sees something different becomes much harder to deal with afterwards.

Do not tell a neighbour what the requirements are, what they may object to or what you are entitled to do, however much you have read about it.

Stating a position you are not qualified to state is the surest way to turn a manageable conversation into an entrenched one.

What applies to shared structures varies by area and by property; leave that to a suitably qualified adviser and confirm locally rather than asserting a position.

Write down what the neighbour would actually experience, such as work close to a shared wall, activity at height beside their garden or something appearing at the boundary.

People react to what reaches them rather than to what is on the drawing, so addressing that directly is more useful than describing the design.

Note anything you are genuinely willing to do to reduce the effect on them, and offer only what you can actually hold the builder to later.

An offer that is later withdrawn does more damage than never having made it.

Photograph your side of the shared structure in detail before anything starts, with dates, including cracks, damp marks, old repairs, decorations and floor junctions.

Close photographs of ordinary blemishes feel pointless now and become the most valuable thing you have if a question is raised later.

Ask your neighbour whether a record of their side could be made, and ask a suitably qualified adviser how such a record is normally prepared and by whom.

Owners often try to arrange this informally with a phone camera, when there is an established way of doing it.

A record of condition on someone else's land needs their agreement and is normally prepared by a suitably qualified professional, not by you.

Photograph the surfaces that vehicles, deliveries and materials would cross, including a shared drive, a path, a kerb, a step and any gate or post beside it.

Damage to a shared surface is the complaint that arrives most often and is the easiest to disprove or accept with a dated photograph.

Note anything already loose, leaning, cracked or damaged on either side and record it plainly, without writing down what you think caused it.

A factual note is useful to everyone, while a note containing your theory about the cause becomes a problem you have to defend.

Never offer an opinion on the cause of an existing crack or defect; that judgement belongs with a qualified structural engineer or surveyor.

Keep the photographs and notes somewhere they will not be lost, and tell one other person in the household where they are held.

This material is needed at the worst possible moment, which is rarely when the person who took it is available.

Note what is stored, planted, parked or built against the shared structure on both sides, since most of it has to move before work can begin.

Moving a neighbour's greenhouse or shed is a conversation to have well in advance rather than on the morning it becomes urgent.

Ask whether scaffolding, staging or any working platform would need to stand on, or lean over, neighbouring land, and raise that as early as you possibly can.

Access is the single most common reason a neighbour conversation has to be reopened after everything else was agreed.

Working from or over land you do not own has to be agreed with whoever owns it; confirm locally what applies before anyone plans around it.

Note where your gutters, downpipes, eaves and roof edge meet or overhang the neighbouring property, and photograph each of those points now.

The roof edge is where work reaches across most often and where existing arrangements are least well understood by either side.

Ask what the work would involve below ground near the shared structure, and write down what you are told rather than assuming new groundwork stays neatly on your side.

What happens underground is invisible to both owners and is where the most serious disagreements begin.

Anything involving ground or foundations near a shared structure is a matter for a qualified structural engineer, not something to settle between neighbours.

Note any tree, hedge or established planting close to the line, and ask what the work would mean for its roots and branches on both sides.

Roots and branches belong to the conversation early because they cannot be dealt with quietly once work has started.

Some trees and hedges are protected and what may be done to them varies by area; confirm locally before anything is cut, dug near or removed.

List everything fixed to the shared structure by either household, such as a light, a dish, a hose reel, a gate, a trellis or a washing line.

Each of these has to come off and go back, and the ones belonging to the neighbour need to be discussed rather than removed.

Ask what would happen to anything serving both properties, such as a shared drain, a shared chimney, a common gutter or a jointly used path.

Shared services are usually discovered mid-work, at which point both households are affected at once.

Speak to the neighbour while the design can still change rather than after everything is settled, so their reaction can influence something real.

A conversation held when nothing can be altered is experienced as an announcement, and it is remembered that way.

Choose a moment when nobody is rushing, and speak face to face where you can rather than putting a letter through the door as the first contact.

The first contact sets the tone, and a letter arriving unannounced reads as formal even when it was meant kindly.

Write a dated note straight afterwards of what was said, what was asked and what you offered, while you can still remember the wording.

Recollections diverge fast, and a note written straight away is worth far more than one reconstructed from memory later.

Follow up with a short written summary and invite corrections, rather than treating your own note as something the neighbour has agreed to.

Inviting correction turns your record into a shared one and surfaces misunderstandings while they are still small.

Do not treat a friendly conversation as agreement to anything, and do not allow work to begin on the strength of goodwill alone.

Goodwill is genuinely valuable and is also the thing most likely to evaporate on the first noisy morning.

A verbal yes is not a substitute for whatever process applies to shared structures where you live; confirm that with a suitably qualified adviser.

Give the neighbour one named contact in your household and a way of reaching somebody once work is under way, rather than a builder number alone.

A neighbour with nobody to ring complains to whoever will listen, which is rarely the person who could have fixed it.

Write down exactly what the neighbour objects to, in their own words, and keep that separate from your own view of why they are objecting.

Objections are often narrower than they first appear, and the specific point is usually solvable once it is written down.

Ask a suitably qualified adviser what routes exist where an adjoining owner objects or does not reply, and record what you are told before you need it.

Knowing there is an ordinary route removes most of the panic and stops owners doing something impulsive.

What happens where an adjoining owner objects or stays silent depends on where you are; this is for a suitably qualified adviser to explain, not for you to decide.

Keep a dated record of every attempt at contact, including letters, calls and visits, written factually and without comment on the neighbour.

A dry factual log is useful to everyone who might later have to look at it, and an annoyed one is useful to nobody.

Do not proceed on the basis that silence means agreement, and do not let a builder start work touching the shared structure while the position is unresolved.

Work started in these circumstances is very difficult to unwind and permanently changes the tone of the relationship.

Whether work affecting a shared structure may begin is not a decision to take yourself; confirm the position with a suitably qualified adviser first.

Avoid discussing the disagreement with other neighbours, and keep everything you write factual rather than personal.

Anything you write may eventually be read by the person it describes, and by people advising both sides.

Ask who would deal with a claim that the work has caused damage next door, and note the answer before anything begins rather than after a claim arrives.

The moment a claim is made is the worst moment to discover that nobody had considered who handles it.

Keep everything about the shared structure together in one place, including photographs, correspondence, notes of conversations and anything a professional issued.

Scattered material is the same as no material once time has passed and the people involved have moved on.

During the work, photograph and date anything that appears on either side of the shared structure, and report it promptly rather than watching to see whether it worsens.

Something noticed early and reported is a manageable conversation, while the same thing raised at the end is a dispute.

Do not judge for yourself whether something that has appeared matters; ask a qualified structural engineer or surveyor to look at it.

Ask what documents you should still hold once the work is finished, who issues each one and who else keeps a copy of it.

Owners often find at the end that a document exists somewhere but was never sent to them.

Write a short plain note explaining what was done to the shared structure and when, and keep it with the property papers for whoever owns it next.

The next owner will be asked about this and will have nothing but what you left behind.

Ask a suitably qualified adviser whether anything about the shared structure should be mentioned if the property is later sold or let.

This question is far easier to answer while everything is fresh and everyone involved is still contactable.

What has to be disclosed on a sale or letting is a legal matter that varies by location; take it to a suitably qualified adviser rather than deciding yourself.

Tell the neighbour when the work is finished and write down anything left outstanding between you, however minor it seems at the time.

Small outstanding items are remembered accurately by the person still waiting for them and vaguely by everybody else.