Temporary roof costs: what you are actually paying for

What a temporary roof actually is

A temporary roof — sometimes called a scaffold roof or temporary roof system — is a free-standing pitched structure built over a building so the work underneath can continue in any weather. Aluminium beams span between scaffold towers on each side, purlins run across them, and the whole thing is covered with corrugated sheeting or shrink-wrap.

The key point for costing is that nothing about it is generic. The span, the pitch, the loading, the wind exposure and the way it ties into the supporting scaffold are all specific to your building. That is why you will rarely see a credible fixed price online, and why anyone quoting a temporary roof over the phone without seeing the property is guessing.

How a temporary roof quote is built up

A temporary roof quote is made up of four distinct parts. Understanding them makes it obvious why two quotes for the same house can differ.

• The supporting scaffold — full perimeter scaffold with enough lifts and ties to carry the roof loads, priced like any other scaffold hire.
• The roof structure itself — aluminium beams, standard or heavy-duty depending on the span, plus purlins, bracing and fixings.
• The covering — corrugated sheeting or shrink-wrap, chosen for the length of the hire and the level of protection needed.
• Design, erection and hire — a designed scaffold with drawings and calculations where the span, loading or wind exposure sits outside a standard configuration, plus the labour to build and strike it and the running hire cost.

As a benchmark for the scaffold element, UK hire averages roughly £22.50 per m² of scaffold. The roof is an additional structure over that, so budget for it as a separate line rather than a small uplift.

What pushes the price up or down

When we measure up for a temporary roof, these are the factors that decide where your quote lands.

• Clear span — the distance the beams must cross unsupported. Short spans use standard beams; long spans need heavier sections and often a full design, and the cost rises sharply.
• Plan area — the total footprint being covered, which sets the quantity of beams, purlins and sheeting.
• Height — the number of lifts in the supporting scaffold before the roof even starts.
• Pitch and shape — a simple duo-pitch over a rectangular building is the cheapest case; hips, valleys, dormers and irregular footprints all add work.
• Wind exposure — an exposed rural site or a tall building needs more bracing and heavier ties than a sheltered terrace.
• Access — whether the beams can be craned or lifted into position easily, or carried through a narrow side gate.
• Hire duration — a six-week roof and a six-month roof are very different commitments.
• Whether the roof needs to be openable or partially removable so materials can be craned in during the works.

When a temporary roof is worth the money

A temporary roof is a real cost, so it is fair to ask whether you need one. In our experience it pays for itself in these situations, and rarely disappoints anyone who chose it.

• Full re-roofs where the property will be open to the sky for more than a day or two.
• Structural timber repairs, where a single night of rain into exposed joists or a rotten wall plate can undo the work.
• Loft conversions and dormer builds, where you are living underneath the works.
• Listed and heritage buildings, where water damage to original fabric is expensive and sometimes irreversible.
• Winter programmes, where a tarpaulin will not survive a single storm and lost weather days cost more than the roof.
• Commercial and occupied buildings where the business underneath has to keep trading.

The comparison worth running is not roof versus no roof. It is the cost of the roof against the cost of weather delays, damaged materials, and a trade crew standing down for three wet days.

Temporary roof versus tarpaulin or shrink-wrap alone

Tarpaulin sheeting over the scaffold is cheaper, and for a short single-elevation job it can be enough. It is not the same product as a temporary roof, and the difference shows in wind.

A tarpaulin relies on the existing roof structure and on fixings that loosen. A temporary roof is a self-supporting frame designed for the loads it will see, which means the trades underneath can work in weather that would otherwise stop them, and materials can be stored dry on the deck below.

Shrink-wrap sits between the two. Wrapped to a proper frame it gives an excellent seal and a tidy appearance, which matters on high-street and heritage work. Wrapped to nothing in particular, it is just an expensive tarpaulin.

Sensible ways to reduce the cost

• Get the temporary roof designed at the same time as the scaffold, not bolted on afterwards — retro-fitting a roof to a scaffold that was not built to carry it costs more than doing it once.
• Confirm your trades' start dates before the roof goes up, so the hire period matches the works.
• Cover only what needs covering. A roof over the main range with sheeting to a lower extension is often the right answer.
• Combine the works. If the roof, the chimney and the leadwork all need attention, do them under one temporary roof.
• Ask whether a shorter clear span is possible using an intermediate support, if the internal layout allows it.