Extension Scaffolding Cost

Extension scaffolding cost in 2026 runs from about £800 for a single storey rear extension to £2,800 for a two storey side and rear wrap. All figures exclude VAT.

Extensions differ from other jobs in one important way: you are scaffolding a structure that does not exist yet, alongside one that does. The tie-in between the two is where the cost sits.

Extension scaffolding cost by type

Extension type	Coverage needed	Typical 2026 cost
Single storey rear	Rear elevation, 2 lifts	£800 to £1,400
Single storey side return	Side plus rear return	£1,000 to £1,800
Single storey wrap around	Side and rear	£1,300 to £2,200
Two storey rear	Rear elevation, 3 to 4 lifts	£1,300 to £2,300
Two storey side	Side elevation plus tie-in	£1,500 to £2,500
Two storey side and rear	Two elevations	£1,800 to £2,800

Published guides put scaffolding for a single storey extension at £800 to £1,200 and a two storey extension at £1,500 to £2,500, which matches the band above once access and region are allowed for.

Side return scaffold price and why it is awkward

A side return on a Victorian terrace is one of the most commonly scaffolded extensions in the UK, and one of the most constrained.

The return is typically 1.8 to 2.5 metres wide. That is enough for a scaffold, but only just, and it creates specific issues:

• No room for a standard standoff. The scaffold sits tight to both the existing wall and the boundary.
• Boundary walls. The neighbouring wall is often within touching distance, which means a party wall award and sometimes permission to oversail.
• Material access. Everything comes through the house or along the return itself.
• Drainage. Manholes, gullies and soil pipes in the return all need to be designed around or protected.

Expect a side return to price 15 to 30% above an equivalent area of open rear elevation for these reasons.

The tie-in to the existing house

An extension scaffold usually serves two purposes at once: access to build the new structure, and access to work on the existing wall where the two meet.

That means:

• Scaffolding above the new roof line so the flashing, tie-in and any raised parapet can be worked
• A platform at the existing eaves where guttering is being altered
• Enough height to remove and rebuild any part of the original elevation

Specify this with the builder. A scaffold built only to the new wall plate leaves the roofer unable to finish the junction, and a return visit to add a lift costs a mobilisation.

Programme length

Extensions run long, and the scaffold stands throughout the external phase.

Extension	Typical external programme	Extension weeks beyond a 6 week hire
Single storey rear	6 to 10 weeks	0 to 4
Side return	8 to 12 weeks	2 to 6
Two storey	12 to 20 weeks	6 to 14

At 5 to 10% per week, fourteen extension weeks on a £2,000 scaffold is £1,400 to £2,800, potentially more than the original quote. This is the single most important number to fix in writing before work starts.

Party wall and neighbours

Most extensions built to or near a boundary engage the Party Wall etc. Act 1996. The scaffold itself frequently needs to sit on or oversail the neighbour’s land, which is a separate permission from the party wall award.

Sort both before booking the scaffold. The Access to Neighbouring Land Act 1992 provides a route through the courts if permission is unreasonably refused, but it is slow and a standing scaffold waiting on it is expensive.

Do you need scaffold for a single storey extension at all?

Not always. A single storey rear extension at 2.4 to 3 metres to the eaves can sometimes be built off a tower or a low working platform, particularly where the walls are blockwork and the roof is flat.

You do need a proper scaffold once any of the following apply:

• the wall plate is above about 3 metres
• materials are being loaded rather than carried
• the roof is pitched and tiled
• work is happening on the existing elevation above the new roof
• the extension abuts a boundary where edge protection is required

Where a tower will genuinely do, the saving is £600 to £1,000. Where it will not, the false economy is a slower build and an unhappy roofer. The comparison is set out in Scaffold Tower Hire vs Full Scaffolding, and for two storey work the figures track a semi-detached job closely.

What affects your price

The variables a scaffolder actually prices from, in order of impact:

1. Number of elevations. The largest single lever on any quote.
2. Frontage length and height. Together these set your face area in square metres.
3. Number of lifts. Each 2 metre lift adds boards, ties and labour. Above 9 metres the rate rises again.
4. Hire duration. Four to six weeks is normally included, then 5 to 10% of the quote per extra week.
5. Access difficulty. Narrow passages, soft ground, long carries and obstructions all add labour hours.
6. Region. Up to 40% between the cheapest and dearest parts of the UK.
7. Extras. Permits, netting, bridging, chimney lifts and temporary roofs.

Next steps

Work out your own number in 60 seconds. Enter your frontage length, working height, elevations and hire period, and the breakdown shows each cost component separately.