How much notice do you need to give before demolition?

A common mistake is to assume work can start as soon as the council is told. In reality the notice period exists so the authority can set conditions first. This page explains how the timing works and how to plan around it.

How the notice period works

The starting point is that demolition is a notified process. Under section 80 of the Building Act 1984, you give the local authority notice of your intention to demolish before any work begins. The authority then has a defined window to consider it. During that window the council can decide to serve a Section 81 counter-notice, which sets the conditions you must follow.

You should not begin demolition until either that period has elapsed or the council has issued its response, whichever comes first. The point of the wait is to give the authority a genuine opportunity to set safety and method conditions before a building comes down, rather than after. Because the precise length of the period and any local procedure can vary, the reliable approach is to confirm the timing directly with your local Building Control body when you serve the notice.

Why you must wait for the council's response

The waiting period is not a formality — it is when the council decides whether to impose conditions through a Section 81 counter-notice. Those conditions can materially affect how you demolish, so starting early risks doing work that then has to be redone or made good. Conditions the council might set include:

• shoring or weatherproofing of adjoining buildings exposed by the demolition;
• making good any damage caused to neighbouring property;
• sealing of sewers and drains and disconnection of services; and
• safe removal of materials and leaving the site tidy.

If you proceed before the council responds, you risk both breaching the notice requirement and carrying out work in a way the council later requires you to change. Serving the notice with enough lead time means you receive any conditions before you start, so the method statement and programme reflect them from the outset.

Planning your programme around the notice

Because the notice period sits at the front of a demolition, it pays to plan backwards from your intended start date. A practical sequence looks like this:

• Surveys first: arrange the asbestos refurbishment and demolition survey early, as removal can add time.
• Serve the Section 80 notice in good time before your planned start, allowing for the council's response window.
• Arrange utility disconnections for gas, electricity, water and telecoms, which need to be booked with the providers and can take weeks.
• Build in the wait for any Section 81 conditions before mobilising to site.

If your demolition also needs prior approval, planning permission, or sits in a conservation area or involves a listed building, those processes take longer still and should be started even earlier. Treating the notice period as a fixed part of the programme — rather than an afterthought — is the simplest way to avoid delays and stay on the right side of the rules.

What can extend the timescale

The notice period is only one of several timing factors. A number of things can extend the lead time before demolition can actually begin, and it is better to allow for them than to be caught out:

• Section 81 conditions: if the council sets conditions on how the work is done — shoring, drainage sealing, making good — meeting them can add time to the preparation.
• Planning routes: where prior approval or full planning permission is needed, those have their own response periods that run separately from the Section 80 notice.
• Protected buildings: conservation area and listed building consents take considerably longer and involve more scrutiny.
• Asbestos removal: if the survey identifies asbestos, removing it safely before the main demolition adds time, particularly for licensed work.
• Utility disconnections: arranging disconnection of gas, electricity, water and telecoms through the providers can take weeks.

These factors often overlap, so the realistic lead time for a demolition is usually longer than the notice period alone. Mapping them out at the start gives a dependable picture of when work can actually begin.

A practical timeline

Pulling the elements together, a sensible way to sequence a demolition is to work backwards from the intended start date and front-load the steps that take longest:

• Earliest: confirm the building's status and the planning route, and commission the asbestos refurbishment and demolition survey.
• Early: begin any planning, prior approval or protected-building consent processes, as these take the most time.
• Well ahead of start: serve the Section 80 notice and request utility disconnections from the providers.
• Before mobilising: receive and incorporate any Section 81 conditions, complete asbestos removal, and confirm services are disconnected.
• Start: begin demolition only once all consents, conditions, surveys and disconnections are in place.

The exact durations depend on the council, the providers and the building, so confirm each with the relevant body rather than relying on fixed figures. The overarching principle is the same throughout: the notice period and the related approvals are part of the project, and building them into the programme from the outset is what keeps a demolition both lawful and on schedule.

Avoiding common timing mistakes

Most notice-period problems come from a handful of avoidable mistakes. Being aware of them helps keep a demolition on track:

• Starting too soon: beginning demolition before the notice period has elapsed or the council has responded risks both an offence and having to redo work to meet conditions issued afterwards.
• Treating the notice as the only requirement: the Section 80 notice does not cover planning, asbestos or utility disconnections, each of which has its own timescale that runs in parallel.
• Leaving disconnections late: because utility providers schedule disconnections weeks ahead, requesting them at the last minute is a frequent cause of delay.
• Underestimating protected buildings: conservation area and listed building consents take far longer than a simple notice, so assuming a quick turnaround leads to slipped programmes.
• Ignoring the asbestos survey lead time: if removal is needed, it must be completed before the main demolition, which adds time, especially for licensed work.

The remedy for all of these is the same: plan the demolition as a project with several parallel strands, start the longest-lead items first, and confirm timescales with the council and providers rather than assuming. A competent contractor will normally manage this scheduling, but the client should understand that the lead time before demolition can begin is driven by the notice period and the related approvals together. Allowing for them properly is what turns a demolition into a smooth, lawful operation rather than a stop-start one.

Frequently asked questions

Sources & further reading

• GOV.UK — Building Act 1984, section 80 (legislation)
• Planning Portal — demolition

Figures on this page are typical UK ranges drawn from published sources and depend on your specific building. They are guidance, not a quotation.