What affects the cost of a new roof?

The short answer

Area is only the starting point. Covering material, the number of valleys, hips and dormers, the condition of battens and timbers once stripped, access and scaffolding, waste disposal and the specification for underlay, ventilation and leadwork all move the figure substantially. Two roofs of the same size can differ widely in price for sound reasons.

What could this mean?

The most common reason two reroofing quotations differ is that they describe different specifications, not different profit margins.

What should you be shown before agreeing to the work?

A written specification naming the covering, underlay, battens and fixings
What is included for leadwork, ridge, verge and ventilation
How unforeseen timber replacement would be priced
Scaffolding and waste removal, stated as included or excluded
The expected programme and what weather delays mean for it

Not every job needs every item. The point is that whatever is recommended should be supported by evidence you can see and a scope you can read.

What could affect the cost?

Covering material and whether existing units are reused
Roof geometry — valleys, hips, dormers and abutments
Condition of battens, underlay and timbers found on stripping
Scaffolding, access and waste removal
Leadwork, ventilation and roofline components included in the scope

Related services

What should you do next?

Ask every contractor to price the same written specification. Without that, you are comparing descriptions rather than prices.

Reviewed by Aaron, Owner, Elite Roofing Services Cumbria Ltd — last reviewed 17 September 2026.

More in Roofing Costs & Quotations

Back to Roofing Costs & Quotations