Home Counties barn conversion cost
Home Counties barn conversion lands at £2,550-£3,060/m² mid spec, applying a 1.16 regional multiplier on the BCIS stone band. Green Belt is widespread, pushing most cases into full planning with the NPPF 154 re-use exception.
Why the premium
The regional cost multiplier is driven by labour-rate, not material. London-adjacent contractors charge South East premiums that BCIS captures in the regional index. End-value premium typically more than offsets the build-cost differential on a like-for-like spec basis.
Green Belt prevalence
Surrey is 70%+ Green Belt; Hertfordshire 50%+. Most barn conversion cases test the paragraph 154(c) re-use exception. The December 2024 grey-belt category eases borderline sites adjacent to settlements.
Specialists active
Savills and Carter Jonas have deep Home Counties rural-planning benches and handle the bulk of complex Green Belt casework in the region.