New Roofs in Brandon - Repair or Replace? Making the Right Call

Expert New Roofs
in Brandon

Why This Decision Matters More Than the Job Itself

Getting the repair-versus-replace question wrong costs money in both directions. Pouring money into repeated repairs on a roof that has run its course is wasteful. But stripping and replacing a roof that had years of useful life left is equally unnecessary. The decision should be based on the condition of the roof, not on what is easiest to sell or quote.

This page sets out the factors that should drive that decision for a new pitched or flat roof, so you can approach any quote with a clearer head.

What a New Roof Actually Means

A full new pitched roof strips the existing covering completely, checks all the timbers underneath and replaces what has failed, then installs new underlay, battens and tiles or slates. On a flat roof - typically over an extension or outbuilding - the deck is inspected, damaged sections cut out, and a fresh waterproofing layer applied. It is a substantial job, and it should not be the default answer every time someone calls about a leaking roof.

When a Repair Is the Right Answer

Repairs make sense when the underlying structure is sound and the problem is isolated. Common situations where repair is genuinely the better option include:

• A small number of cracked, slipped or missing tiles causing a localised leak
• Failed pointing or mortar on ridge tiles or hip tiles that has let water track in
• A lead flashing at a chimney, wall abutment or dormer that has lifted or cracked
• A single area of flat roof where the membrane has split but the rest is intact and bonded firmly
• Blocked or cracked guttering that has caused water to back up under the eaves

In each of these cases the failure is specific and repairable. Replacing the entire roof to solve a flashing problem would be like replacing a car engine because a tyre is flat.

When Replacement Makes More Sense

There are situations where repair becomes a false economy and full replacement is the smarter spend. A full new pitched roof in Brandon and the surrounding area typically costs between £5,500 and £10,000 for a standard semi-detached house, depending on pitch, access, size and materials. That sounds like a lot until you compare it to five or six repair visits over three years, each one only partially solving the problem.

Replacement is the right answer when:

• The tiles or slates are reaching the end of their usable life. Concrete tiles from the 1970s and 1980s can become porous and brittle, losing their ability to shed water properly. If more than 20-25% of them are cracked or lifting, you are past the point where patching makes sense.
• The underlay has failed. Older felt underlay degrades over decades and becomes brittle. Once it tears, any water that gets past a tile has a direct route into the timber. A roofer who lifts a few tiles and finds the underlay crumbling should explain this clearly and show you.
• The timbers are compromised. Rotten rafters or wall plates are a structural issue, not just a waterproofing one. If rot is widespread, a full strip gives you access to address it properly rather than patching around it.
• You are adding a loft conversion or extension. Any significant structural change to the roof is an opportunity to bring the whole covering up to current standards rather than tying new work into an aging system.
• The roof has been repaired repeatedly without a lasting fix. If a patch has been attempted in the same area twice or more and the leak keeps returning, the problem is likely deeper than the patch is reaching.

The Flat Roof Question

Old three-layer felt flat roofs - the kind fitted on most 1960s to 1990s extensions - have a life expectancy of around 10-15 years. Many are now well past that. A single blister or split can often be patched, but once the felt has generalised crazing or is soft and spongy underfoot, the deck beneath is usually taking water and the whole system needs replacing.

Modern replacements - EPDM rubber membranes or torch-on felt systems - are a significant improvement on old felt. When fitted correctly with properly finished upstands and edge details, they are far more durable. A well-installed EPDM membrane can last 30 years or more under normal conditions. If your extension's flat roof is more than 15 years old and has never been replaced, it is worth having it properly inspected rather than waiting for the next wet ceiling.

Questions to Ask the Roofer Before Deciding

Any roofer recommending a full replacement should be able to explain precisely why. Ask them to show you, on the roof, what they have found. The condition of the underlay, the state of the battens and the number of failed tiles should be visible and demonstrable. A vague answer like "it's all had it" is not enough. You need specifics.

• What percentage of the tiles would you say are beyond use?
• Is the underlay still intact? Can you show me?
• Are there any rotten or compromised timbers, and where?
• If I repaired now instead of replacing, how long realistically do you think that would hold?
• What would the repair cost, and what would replacement cost, set out separately?

A roofer who cannot or will not answer these clearly is not giving you the information you need to make a sound decision.

Materials for a New Roof

If you do go ahead with a full new roof, the choice of material matters. Concrete interlocking tiles are the most common choice - they are practical, cost-effective and easy to source for future repairs. Clay plain tiles suit older or more traditionally styled properties and last well. Natural slate costs more but is thinner and lighter than concrete, which matters on some older roof structures where the timbers cannot take a heavy load.

If your property is in a conservation area, check what the local planning authority will accept before agreeing a specification. Some areas require a particular tile profile or colour, and finding that out after the old roof is stripped is not a position you want to be in.

Making the Call

The honest answer is that many borderline roofs could go either way, and a roofer who tells you there is only one right answer without getting up and looking properly is not giving you the full picture. A thorough inspection, a clear explanation of what has been found, and separate costings for repair and replacement give you what you need to decide.

If your roof in Brandon needs looking at properly, call us to arrange a roof survey and we will tell you straight what we find and what we think you should do about it.