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No matter if you are moving, or improving, our newsletter is packed with the best tips, tricks and ideas to help you dwell well.
You've upgraded the boiler. You've had the loft topped up, maybe swapped the windows for double or triple glazing, and you've draughtproofed the doors. On paper, the house should feel warmer and cost less to run. So why does the living room still take forever to warm up on a cold morning, and why is the heating kicking in more often than it should?
For the millions of UK homes with an attached or integral garage, the answer is often hiding behind a door you don't think twice about. A standard garage sits directly against your heated rooms, and in most cases it's colder than the outside air on a still day because it never gets any sun or any heat.
That cold mass presses against your kitchen wall, your hallway, or the bedroom floor above, and your boiler spends its day compensating for it. Sorting it out belongs firmly among the durable, energy-smart changes worth making when renovating for the future, and in most cases it's quicker and less disruptive than the bigger projects that usually dominate the list.
Most older garage doors are single-skin steel or basic up-and-over designs with no meaningful insulation and poor sealing around the frame. Cold air doesn't just sit in the garage, it moves. Every time the door opens, or the wind pushes against a gappy seal, that cold air cycles through the space and drops the temperature of every surface it touches, including the wall you share with the house.
The problem compounds in attached garages where the internal door between the house and garage is the only real barrier. If that door has gaps, or if the floor between an integral garage and a room above is poorly insulated, the thermal loss becomes significant. You can insulate the rest of the property to a high standard and still be fighting this one weak point.
Think of it this way: you wouldn't install double glazing and leave a single-pane window in the same room. Upgrading everything but the garage door creates exactly that kind of imbalance.
Modern insulated roller doors are a genuine step forward from the basic options most of us grew up with. The difference is in how the slats are made. A quality door uses foam-filled, double-skinned aluminium slats, which create a real thermal barrier rather than just a physical one. Add rubber seals at the base, brushes along the side guides, and a fitted hood at the top, and you've got a door that actually blocks cold air rather than just slowing it down.
Slat depth is one of the key things to compare. Entry-level insulated doors typically use 55mm slats, which give a decent thermal improvement while fitting into compact headroom. The next step up uses 77mm slats, which deliver noticeably better insulation and handle wind resistance better too. If your garage shares a wall with the house, it's worth going for the thicker option.
Placement matters too. A door installed behind the structural opening allows the guides and seals to perform at their peak, whereas an external fit may lose some thermal efficiency. It's a detail that is often missed until after the fitters have left, so clarify your installation options early.
Because the market is flooded with different specifications, the roller door FAQs at Best Roller Garage Doors provide a helpful breakdown of the technical variables, from U-values to motor options, helping you make an informed choice before committing.
It can, indirectly. An EPC is a modelled assessment of how your home is built, covering insulation, glazing, heating type, and overall fabric, with standard occupancy assumptions applied so different properties can be compared fairly. For existing homes, assessors use a simplified version of the Standard Assessment Procedure called RdSAP. Unheated garages are excluded from the assessed floor area, but the walls and floors separating them from the heated parts of your home are included as heat loss elements.
Reduce the cold exposure on those surfaces, and you're improving the performance of the fabric elements the assessment does measure. The government's guidance on EPCs is a useful starting point if you want to understand the process before booking a reassessment after any upgrades.
A new garage door on its own won't transform your rating, but it contributes as part of a wider set of fabric improvements, and it makes the upgrades you've already paid for actually do their job. If a sale is on the horizon, it's worth considering alongside other changes that influence both running costs and buyer appeal.
Replacing a garage door is one of the most accessible upgrades a homeowner can make. A standard installation takes just a few hours and requires no structural work, and the difference is immediate. A tired up-and-over replaced with a clean, insulated roller door transforms the front of the house, and that matters whether you're staying put or thinking about selling in the next few years.
The real value, though, is in the building's envelope. By sealing the garage properly, you aren't just making a cosmetic change, you are addressing thermal loss at its source. As the Energy Saving Trust notes, reducing heat escape routes is the most cost-effective way to improve efficiency. It's time the garage stopped being a thermal afterthought.
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