Shoring and temporary works during demolition

Temporary works demolition shoring rarely appears in a planning policy document, yet it decides whether a demolition programme can actually be built as drawn. Propping that needs to land on the public footway, a party wall that has to be stabilised from the neighbour's side, or a facade held by a scaffold tower that sits where the new building goes, are all constraints on the permanent scheme. Resolve them at design stage and they become method statements. Leave them and they become redesigns after permission.

The planning system does not approve temporary works. The highway authority, building control, the party wall surveyors and the Construction (Design and Management) Regulations 2015 all do, in their own ways, and a planning layout that ignores them will not survive contact with the site.

Why temporary works reach the planning stage

Three routes bring them into the application.

The first is footprint. Where propping, scaffolding or a crane base occupies land outside the site boundary, the applicant has to show control of or access to that land, and the ownership certificates on the application form have to be right. Signing certificate A when a propping scheme needs the neighbour's land is a defective application.

The second is deliverability. Where a conservation officer or the highway authority asks how a retained facade will be held, or how a terrace end will be stabilised after the adjoining demolition, the answer has to exist before permission. A scheme that cannot be built without a six-month footway closure is not the same scheme the committee thought it was approving.

The third is condition drafting. Construction management plans are routinely secured by condition before works may start, and the content of that plan is where temporary works end up being scrutinised. A Construction Management Plan that addresses propping, hoardings, highway occupation and monitoring is a better document than one that only lists delivery hours.

Propping that lands on the public highway

Anything on the footway or carriageway needs the highway authority's permission, and the relevant powers are in the Highways Act 1980.

• Hoardings and scaffolding on the highway need a licence under section 169 or section 172, depending on what is being done.
• Placing building materials or plant on the highway needs a licence under section 171.
• Structures over the highway, including gantries and overhead protection, need a licence under section 177 where they are over a highway maintainable at public expense.
• Temporary footway or carriageway closures are secured through a traffic regulation order or a temporary notice, with notice periods that run to weeks rather than days.
• Where the works affect the structure of the highway, a section 278 agreement may be needed for the permanent reinstatement.

Licence fees and charges are set locally and reviewed, so check the current schedule with the authority rather than carrying a figure from an earlier job. On a busy high street, a bus route or a route with a cycle lane, expect the authority to refuse a long-term lane closure and to require the propping scheme to be redesigned to sit within the site.

That constraint shapes the structural solution. A raking shore uses little steel and a lot of ground. A flying shore spanning between two buildings costs more in steel and takes almost no ground. On a tight urban terrace the flying shore often wins for that reason alone.

Stability of retained and adjoining structures

Demolishing one unit of a terrace removes lateral restraint from its neighbours, and this is where most of the real risk sits.

The structural questions to answer before any application is submitted: what is holding up the party walls once the floors on your side are gone, whether the chimney breasts on the party wall are load-bearing or were gathered into the removed structure, how the exposed party wall will be weatherproofed, and whether the foundations under the party wall are adequate for a new structure bearing against them.

A Structural Survey of the retained and adjoining buildings gives the baseline. It should record crack patterns, verticality, floor levels and existing movement, with photographs, because that record is the defence against a later claim that the works caused damage that was already there.

The Party Wall etc. Act 1996 runs in parallel and is a separate legal track. Notice under section 3 is needed for work to a party structure, section 6 for excavation within 3m or 6m depending on depth, and the neighbour can appoint a surveyor and require a schedule of condition. None of that is a planning matter, and none of it is optional. The practical point is timing: a party wall award can take months where the adjoining owner dissents, and that sits on the critical path.

Sequencing demolition to maintain stability

The sequence is the engineering. A method statement that describes an end state without the order of operations is not a method statement.

1. Install monitoring and record the baseline condition of adjoining structures.
2. Erect hoardings, scaffolding and any protective fans, with the highway licences in place.
3. Install temporary propping and shoring, and have it checked and signed off by the temporary works coordinator before loading.
4. Strip soft materials, services and asbestos, under the Control of Asbestos Regulations 2012 where present.
5. Take the structure down top-down, floor by floor, maintaining the designed restraint at every stage.
6. Deal with chimney stacks and party wall features as a separate operation, before the floors that restrain them are removed.
7. Weatherproof and make good the exposed party wall.
8. Remove propping only in the reverse order to installation, and only once the permanent structure provides restraint.

Step three is where the regulatory weight sits. BS 5975 sets out the procedural control framework for temporary works, including the role of the temporary works coordinator and the requirement for independent design checks at a level proportionate to the risk. Demolition itself is covered by BS 6187. Neither is a planning document, but a demolition method statement that references them reads as competent to a case officer and to building control.

What the method statement should show

A statement that answers the questions in advance saves a round of correspondence. The content worth including:

• A site plan showing the propping layout, its footprint, and anything outside the site boundary.
• The structural design basis and loadings for the temporary works, with the designer named and their competence stated.
• The demolition sequence, stage by stage, with a drawing for each stage where the restraint changes.
• Highway occupation: what is needed, where, for how long, and which licence covers it.
• Pedestrian and cycle routeing past the site, with widths that meet the authority's requirements.
• Monitoring: what is measured, trigger and action levels, reporting frequency and who receives it.
• Dust, noise and vibration control, with BS 5228 Parts 1 and 2 as the reference for construction noise and vibration.
• The emergency and unplanned collapse procedure.
• Reinstatement of the highway and removal of all temporary structures.

Where ground conditions govern the propping foundations or a basement is involved, a Geotechnical Assessment provides the bearing capacity and groundwater information the temporary works designer needs. Councils usually expect a suitably qualified author for structural and geotechnical work, so professional review is strongly advised.

Licences and agreements running in parallel

The consents to programme together, because they have different lead times and different decision makers:

The section 80 notice catches people. It is a building control process separate from planning, requires six weeks' notice to the local authority, and the counter-notice can impose requirements about shoring and weatherproofing adjoining buildings.

Monitoring during the works

Set the monitoring regime before work starts and write the trigger levels into the method statement rather than deciding them during an incident.

Typical arrangements use precise levelling or automated total station monitoring of targets on adjoining structures, crack width gauges across existing cracks, verticality checks on retained walls and party walls, and vibration monitoring where percussive plant is used near sensitive structures. Each gets a green, amber and red threshold, with a named action at amber and a stop at red.

Share the regime with the adjoining owners before the first prop goes in. A neighbour who has seen the monitoring plan and knows who to call is a different proposition from one who finds a crack and reaches for a solicitor.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. For specialist technical reports, qualified professional input may be required. This is general guidance rather than legal advice. Check the position with your local planning authority, the highway authority and a qualified structural engineer before relying on it.