The Extension Is a Good Reason to Look Up
When a builder quotes for a rear extension, most homeowners focus on the layout, the bi-fold doors and the kitchen units. The roof barely gets a mention. But an extension project is one of the best opportunities you will ever have to sort out an ageing roof at the same time, and ignoring that can cost you considerably more money a few years down the line.
In Newmarket and across the surrounding villages, we regularly see semi-detached and terraced homes where the original 1930s or 1950s roof tiles have never been touched. If your property falls into that bracket, read on before you sign off your extension plans.
Why Timing Matters More Than You Think
Scaffolding is expensive to erect and dismantle. When your builder puts it up for the extension, your roofer can often use the same structure, or a modest addition to it, to access the main roof at a fraction of the standalone cost. Once the scaffolding comes down and the builder has been paid, re-erecting it purely for a roof job will add several hundred pounds to the bill before a single tile is lifted.
There is also a practical disruption argument. Your home will already be a building site. Dust sheets, skips and tradespeople coming and going are par for the course during an extension build. Having the roof done at the same time adds very little extra disruption compared with going through it all again twelve months later.
If your existing roof is approaching 20-25 years old or showing signs of wear, booking a roof replacement alongside the extension is almost always the more economical decision when you factor in the combined scaffolding costs.
What to Consider Before Deciding
Not every roof needs replacing just because an extension is being built. Here is what we look at when advising homeowners in Newmarket and nearby areas like Mildenhall and Bury St Edmunds:
- Age and tile condition: Concrete interlocking tiles from the 1980s and 1990s can become porous and brittle. If tiles are crumbling at the edges or showing heavy moss growth, that is a sign the material is coming to the end of its life.
- Felt underlay: The sarking felt beneath your tiles has a finite lifespan. Once it starts to tear, rain can work its way in even if the tiles above look intact. This is invisible from the ground but visible during a proper survey.
- Lead flashings: Any valleys, chimney junctions or abutments rely on lead work. Failing lead is a common source of persistent leaks in older Suffolk properties. We carry out lead work as part of a re-roof or as a standalone repair.
- Structural changes: Some extensions alter the roofline or add a flat roof section at the rear. That junction between old and new construction must be properly detailed, and it is easier to do that well when the surrounding roof covering is also fresh.
Planning Permission and Building Regulations
Most straightforward re-roofs using the same materials are classed as permitted development and do not need planning permission. However, if you are changing the roof shape, raising the ridge or using different materials on a listed building or in a conservation area, you will need to check with your local planning authority first. Newmarket town centre and several surrounding villages have conservation designations, so this is worth confirming early.
Building Regulations Part L (energy efficiency) also applies to new roof construction. When replacing a roof on a heated building, insulation standards must meet minimum U-value requirements. A competent roofer will factor this in automatically, but it is worth asking about directly. You can find the relevant guidance at GOV.UK building regulations.
The Flat Roof Question
Many extensions use a flat or very shallow-pitched roof. This is a separate and equally important decision. Modern flat roofs built using EPDM rubber or GRP fibreglass can last 25-30 years when properly installed, which is a world away from the felt flat roofs that gave this roof type a bad reputation in older housing. Our flat roofing work covers extension roofs throughout Newmarket and the surrounding Cambridgeshire and Suffolk border area.
If your extension roof and your existing main roof are being done at the same time, make sure both are specified clearly in the same contract. Ambiguity between what the builder is providing and what the roofer is providing causes disputes and gaps in workmanship.
Get Advice Before the Build Starts
The best time to call us is before you commit to your extension plans, not after. We can carry out a roof survey, tell you honestly whether the existing roof needs attention now or still has years of useful life left, and give you a clear quote that your builder can work around.
If you are planning an extension anywhere in Newmarket or the surrounding area, get in touch for a free roof survey and quote. We will give you a straight answer with no upselling.
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