How Much Does a Complete Re-Roof Cost in Chester?

Two quotations for the same Chester house can both say “complete re-roof” at the top and describe substantially different pieces of work. The phrase is not regulated, and it gets used to mean anything from a full strip back to the rafters down to a re-covering that leaves most of the existing build-up in place.

Since cost follows scope, this guide starts with what the word ought to mean, then compares it honestly against the cheaper alternatives — because sometimes the cheaper alternative is the right choice, and sometimes it is a way of paying twice.

What “Complete” Should Mean

Used properly it describes stripping the roof back to the rafters and rebuilding the whole covering system. Every layer is new:

• The existing covering stripped, sorted where relevant, and removed from site
• Rafters, purlins and wall plates inspected while exposed, and defective timber replaced at a rate agreed beforehand
• New breathable underlay across the whole roof, dressed into the gutter at the eaves
• New treated battens at the gauge the chosen covering requires
• New covering laid to the manufacturer's fixing specification
• New lead to chimneys, abutments and valleys
• Ridge and hip mechanically fixed, whether or not mortar is also used
• Verges finished appropriately to the property
• Ventilation at eaves and ridge
• Insulation brought up to current standards where the threshold is crossed
• Building control notification or self-certification, with a certificate issued

Anything materially less than that is a different job. It may well be the right job for your roof — but it should be described as what it is rather than as a complete replacement.

The Three Options, Compared Honestly

Why an overlay is usually a false economy

Overlaying looks attractive because it removes the strip, the waste and much of the labour. The problems are structural and practical. You are adding a second covering's weight to a roof designed for one. You cannot see the timbers, so anything wrong with them stays wrong and keeps going. And the old underlay and battens — very often the actual reason the roof is failing — remain exactly where they were.

There is also a sting in the tail: when the roof does eventually need doing properly, the strip is heavier and more expensive than it would have been.

There are cases where it is defensible, generally on a relatively young roof where the covering has failed but everything below it is demonstrably sound. Those cases are rarer than the number of overlays being sold would suggest.

Where partial work genuinely makes sense

If the rear slope has failed and the front is sound, doing the rear is a reasonable decision — especially where a ridge separates them and there is no visual join. What rarely works is splitting a single continuous plane: you pay for scaffolding and set-up twice, and you get a line between old and new that will still be there in twenty years.

What Moves the Cost Within a Complete Re-Roof

• The covering. Concrete interlocking tile at one end, natural slate at the other, with a wide spread in both material and labour.
• Roof complexity. Hips, valleys, dormers and chimneys all add cutting, lead and time.
• Timber found defective. Unknown until the strip, which is why the rate should be agreed in advance.
• Access. Whether a scaffold stands on the plot or needs a footway licence.
• What else is done at the same time. Fascias, soffits, guttering, chimney repointing — cheap now, expensive later.

The Regulations, in Brief

Two systems, and they are separate. Planning: a like-for-like re-roof does not materially affect the external appearance of a building, so under section 55 of the Town and Country Planning Act 1990 it is not development at all and needs no permission. A visible change of covering can be a different matter, particularly inside a conservation area.

Building regulations: where more than 50% of the roof's surface area is renewed, or the work forms part of a major renovation, regulation 23 of the Building Regulations 2010 requires the roof to be brought up to current thermal standards so far as that is technically, functionally and economically feasible. A patch repair does not trigger it, and neither does a roof over unheated space such as a detached garage. The work is signed off through building control or by a roofer registered under a competent person scheme, and you should receive a certificate.

Getting a Figure

We do not publish rates, because a rate quoted without seeing the roof is a number that will change. What we do is survey the roof and the loft, write down exactly what is included, state the rate for defective timber before starting, and give you a quotation that can be compared line by line with anyone else's.

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