levels as homes built after this legislation
came into force. Adding an extension is
an excellent opportunity to improve an old
house’s overall thermal efficiency, bringing it
up to speed with modern homes.
About a third of all heat lost can be
attributed to uninsulated or badly insulated
walls, so they should be your first port of
call. Cavity walls are an excellent option
for an efficient build and should be used
for any new extension. The cavity can be
filled with a layer of insulation, keeping heat
trapped within the room. It’s also important
to consider what the actual wall is made of.
One thing to look for is a material’s U-Value.
This shows the rate of transfer of heat
through a structure. The better insulated a
wall, the lower the U-Value.
Additionally if more space means an extra
bedroom, it can be rented out providing an
extra source of income.
How can homeowners get the most space
out of an extension? Sometimes this can
just be cosmetic. Wide windows, mirrors
and light colours can make a room appear
larger than it is. When it comes to physically
expanding, incremental gains can add up to
significantly more room. Recessed skirting
boards, built-in storage and sliding doors
may seem small changes, but combined
they make a noticeable difference. New
innovations in building materials can make
walls up to 100mm thinner. This will provide
5%-7.5% extra floor space. Considering a
square metre adds £2,395, this gain can
quickly accumulate to add significant value.
UPGRADE YOUR ENERGY-EFFICIENCY
All new builds in the UK have to adhere to a
minimum-level of energy efficiency. Not only
does this help the environment by reducing
carbon emissions, it’ll also significantly
slash occupants’ heating bills. However
older homes built before the 2018 ‘Domestic
Minimum Energy Efficiency Standard’
(MEES), do not have the same performance
Poor insulation carries the risk of damp
forming or worse, mould, as warm air
traps more moisture. This can damage an
extension’s envelope as well as causing
respiratory issues for tenants. However this
is another important reason to carefully
choose building materials. For example,
polypropylene panels will seal against
wind-driven rain from outside, maintaining a
moisture-free environment.
BIGGER BENEFITS
Extensions can be a massive and disruptive
undertaking, however the benefits are
worth it: More living space and a higher
property value. In a sluggish market it’s more
financially savvy than moving to a brand
new home. Still, making such an investment
needs to be well thought through. Consulting
experts such as architects and structural
engineers is an excellent place to start.
Carefully considering each aspect of the new
build will bring savings, sustainability and a
more pleasant living environment.
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