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Party Wall Timeline Calculator:When to Serve Your Notice

📅 Free Tool · Party Wall etc. Act 1996

Party Wall Timeline Calculator:
When to Serve Your Notice

Your builder has a start date. Miss the party wall deadline and that date slips, the crew sits idle, and you keep paying. This free calculator works backwards from your start date and tells you the exact day you need to serve notice. Plan with confidence, not guesswork.

✓ Free, no sign-up ✓ Sections 1, 2 & 6 ✓ Works backwards from your date ✓ Consent vs dispute timing

Here is the thing most homeowners learn too late. A party wall notice is not a quick form you send the week before work starts. Under the Party Wall etc. Act 1996, you have to give your neighbour a fixed amount of warning, and that period cannot be shortened, even if everyone is happy to crack on.

Section 2 works need two months’ notice. Section 1 and Section 6 works need one month. Then your neighbour gets 14 days to respond, and if they dissent, the surveyor and award process adds more time on top. The calculator below works all of that backwards from your planned start date, so you know the real deadline.

Timeline Calculator

Work out your notice deadline

Tell us when you want works to start and what you are building. We will work backwards to your serve-by date and map every milestone.

Serve your notice by
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This is the latest safe date to hit your start
Your timeline, step by step
Consent route vs dispute route
🤝 Consent route
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Neighbour agrees in writing. Works can start once the notice period ends.
⚖️ Dispute route
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Dissent or silence. Surveyors appointed and award drafted before works start.
Want us to serve your notice on time?
Send your postcode, start date, and project. We will prepare and serve the correct notice and keep your build on schedule. Reply within one business day, free, no obligation.
Keep My Build On Track
All 33 London boroughs covered · Fast notice service · Response within 1 business day

This calculator gives indicative timings for guidance only. It is not legal advice. Actual timelines vary with neighbour response, surveyor availability, and project complexity.

How the Party Wall Timeline Works

A party wall timeline runs in a fixed order, and every stage has to finish before the next one starts. First you serve a valid party wall notice on every affected neighbour. Then the clock runs for the statutory notice period set by the Party Wall etc. Act 1996. Your neighbour has 14 days from receiving the notice to respond. If they consent, you wait out the notice period and begin. If they dissent or stay silent, a dispute is deemed to have arisen, surveyors are appointed, and a party wall award must be in place before any work begins.

The single biggest planning mistake is treating the notice as the last box to tick. It is the first. Work backwards from your build date, not forwards from today, and you will never be caught short.

Notice Periods by Section

Section 1, new wall on the boundary, needs one month’s notice. This is the Line of Junction Notice, served when you build a new wall on or astride the boundary line between two properties.

Section 2, works to an existing party wall, needs two months’ notice. This is the longest period and the most common trigger in London. Loft conversions, rear extensions, chimney breast removals, and steel beam insertions all sit here.

Section 6, excavation near a neighbour, needs one month’s notice. This covers basement digs and deep foundations within three or six metres of a neighbouring structure. A schedule of condition is strongly advised before any excavation begins.

If your neighbour consents in writing, your timeline is clean. You serve, you wait out the notice period, you start. No award, no surveyor delay.

If your neighbour dissents, or simply does not reply within 14 days, the timeline lengthens. Surveyors are appointed, a schedule of condition is carried out, and the award is drafted and served. For a straightforward job this can be wrapped up inside the notice period. For a complex one, especially a basement, it can add several weeks. That is why the calculator above shows a later serve-by date for the dispute route. It builds in the breathing room you will be glad you had.

3 Ways to Protect Your Start Date

We see the same three mistakes cost London homeowners weeks every month. Here is how to avoid each one before it happens to you.

① The early bird

Serve sooner than you think you need to

Picture this. Your builder is booked for March and you are quietly confident. You serve the notice in late January, thinking a month is plenty. Then your neighbour does not reply, the 14 days lapse into a dispute, and suddenly you need an award that will not be ready until April. Your crew turns up in March to a job they legally cannot touch, and you are paying them to stand in your driveway.

The fix is simple. Serve the moment your plans are final, not the moment your build is near. Every extra week of lead time is a week of insurance against a slow or silent neighbour. There is no penalty for serving early. There is a very real cost to serving late.

② The good neighbour

Knock on the door before the letter lands

A formal notice arriving cold through the letterbox feels like a threat, even when it is routine. Neighbours who feel ambushed dissent on principle, and a dissent is what tips you onto the slower, costlier dispute route.

The homeowners who keep their timelines tight do one thing first. They have a five-minute conversation over the fence. They explain what they are planning, when, and that a formal notice is coming because the law requires it. That single conversation is the difference between a written consent in a week and a deemed dispute that drags on for two months. It costs you nothing and it protects your start date more than anything else you can do.

③ The locked plan

Finalise your design before you serve

Here is a trap that catches people who are trying to move fast. They serve the notice early, which is right, but the architect is still tweaking the steels and the foundation depth. Then the design changes, the notice no longer matches the works, and the whole clock resets from a fresh notice.

Serve early, but serve from a finalised design. Get your structural drawings and excavation depths signed off first, then serve once and let the notice period run clean. If you are not sure which notice your final design even needs, run our party wall notice checker before you serve, so the right notice goes out the first time.

Do I Need a Party Wall Notice? Free checker covering Sections 1, 2 and 6. Confirm which notice your project needs. Party Wall Cost Calculator Estimate your surveyor fees by project, borough, and number of neighbours. Party Wall Agreements & Awards What the award contains and how the dispute process runs in London. Schedule of Condition Reports The pre-works record that protects you against neighbour damage claims. Party Wall etc. Act 1996 Guide A plain-English breakdown of the Act for London homeowners. Speak to a Party Wall Consultant Get your notice served on time and your build kept on schedule.

Party Wall Timeline: Frequently Asked Questions

It depends on the section. Section 2 works to an existing party wall need two months’ notice. Section 1 new boundary walls and Section 6 excavations need one month. Serve earlier than the minimum wherever you can, because a dissenting or silent neighbour adds award time on top.
The statutory notice period is fixed and cannot be formally shortened. However, if your neighbour gives written consent before the period ends, you can usually proceed once consent is confirmed rather than waiting out the full term. Get that consent in writing, not verbally.
If there is no response within 14 days of receiving the notice, a dispute is deemed to have arisen under the Act. You cannot start works. A surveyor must be appointed and a party wall award drawn up before work begins, which is why silence still adds time to your timeline.
For a straightforward residential project, an award can often be completed within a few weeks of the surveyors being appointed, sometimes inside the notice period. Complex projects such as basements take longer because of the schedule of condition and structural detail involved.
Yes. If you select that your neighbour is unsure or difficult, the calculator builds in extra time for surveyor appointment and award drafting, and gives you a later, safer serve-by date so a dispute does not derail your start.
Ideally before you serve, so the notice goes out correctly the first time and there is no delay if a dispute arises. A surveyor can confirm which notice applies, serve it properly, and be ready to move straight into the award process if your neighbour dissents.
📅 Keep Your Build On Schedule

Get your party wall notice served on time.

Send us your postcode, start date, and project. We will serve the right notice promptly and keep your timeline on track. Reply within one business day, free, no obligation.

Keep My Build On Track

All 33 London boroughs · Fast notice service · Response within 1 business day

By Nauman Zafar | Party Wall Consultant | Survey of Party Wall · Last Updated: May 2026
Content reviewed against Pyramus & Thisbe Club best practice guidelines. This page is for general guidance only and does not constitute legal or surveying advice.