A Qome Snap Guide: quick, honest and no guff. Approximate figures, adjusted to your region inside Qome.
Snap answer
£2,200 – £3,960 /m²
A modular garden annexe starts around £2,200/m². Brick-built annexes run about £3,960/m². A typical one-bed annexe of 35m² lands £77,000–£139,000.
Takes3–6 weeks modular · 10–16 weeks brickDisruptionModerate, garden becomes a site; crane day for modular
Cost at a glance
Option
Best for
Guide range
Modular
Factory-built, craned in
£2,200 /m²
Brick-built
Traditional build, matches the house
£3,960 /m²
Approximate guide figures, not quotes, Qome adjusts every price to your region.
What actually happens
Feasibility first, planning is the gatekeeper on annexes
Base and services laid: water, drainage, power from the house
Modular: unit delivered and craned on in a day. Brick: build proceeds like a small house
Connected, insulated and first-fixed
Kitchen and bathroom fitted
Decoration, certification and sign-off
Price by region
Starting figures by region, the same honest baseline, adjusted for where you live.
London (Inner)from £3,400 /m²
London (Outer)from £3,000 /m²
South Eastfrom £2,600 /m²
East of Englandfrom £2,400 /m²
South Westfrom £2,300 /m²
Scotland (Highlands)from £2,100 /m²
West Midlandsfrom £2,100 /m²
North Westfrom £2,000 /m²
East Midlandsfrom £2,000 /m²
Scotland (Central)from £2,000 /m²
Yorkshirefrom £2,000 /m²
Walesfrom £1,950 /m²
North Eastfrom £1,850 /m²
Northern Irelandfrom £1,800 /m²
Popular choices
One-bed with wet roomOpen-plan studio layoutsMatching brick or contrasting cedar
Rules & regulations
Annexes for a family member usually need planning permission, the test is whether it stays 'ancillary' to the main house rather than a separate dwelling
Building regulations apply in full: it's habitable accommodation
Council tax treatment varies; annexes for family often qualify for a 50% discount or exemption
Snap tips
Talk to the planning department before spending a pound, annexe rules vary sharply by council
Modular wins on speed and certainty; brick wins on lifespan and blending in
Price it properly on Qome
Choose your options and see an honest, region-adjusted estimate, free.