If you are thinking of extending your property, a
loft conversion will cost less per sq m than a
ground floor extension. Not all roof designs are
suitable, though.
Most houses built before 1960 have roofs of an
individual rafter design, more easily converted than
later types. Steep-pitched roofs offer the most
potential. As a rule of thumb, allow for a minimum
height requirement of 2.3 m over at least half the
floor area.
A typical three bedroom house will usually be
able to accommodate an en-suite fourth bedroom
within its loft space, adding significantly to its
value. It is essential though, that the addition
looks as integral to the house as possible. The
staircase is key to this, ideally repeating the
direction of the lower staircase and consistent in
style.
Unless you live in a conservation area or own a
listed building, planning permission is not usually
needed. Certain elements will need approval, though,
such as positioning a dormer window to the front of
the roof. Privacy issues can arise where new windows
will overlook your neighbour's property and these
may cause setbacks. And, if you have already
exceeded your 15% extension allowance with a
conservatory or a side addition, you will need to
seek approval from your local council; allow for a
wait of 8 to 12 weeks if any of these apply.
What it costs: from approximately £25,000 for one
bedroom with en-suite bathroom totalling 20 sq m,
fully finished, depending on location.
Shopping list: Empty shell of 16 sq m with
staircase, plasterboard walls, windows and chipboard
floor, from £12,000.
Small study and landing, 18 sq m, from £20,000.
Wooden framed roof window, 114 x 98 cm, £239,
plus fitting.
Dormer window, 2 m wide, £6,000
Bespoke staircase, £2,300
Planning permission, £110.
Extras: Polycarbonate roof dome, 100 x 100 cm,
with remote control, £400, plus fitting.
'Means of escape' window, 74 x 140 cm, £290 plus
fitting.
Remote control system with rain sensor, for three
windows, £690, plus installation.
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