South West barn conversion cost
Costs verified against BCIS Online (May 2026 release) and ONS Construction Output Price Index, April 2026. Class Q rules current to the 21 May 2025 GPDO amendment.
South West barn conversion sits at £2,250-£2,750/m² mid spec for stone, applying a 1.04 BCIS regional multiplier. Stone, cob and timber are all common substrates; Class Q is widely available outside the AONBs (Cornwall AONB, North Devon, parts of Dorset).
Regional multiplier
BCIS South West regional multiplier sits close to UK average (~1.04 over the past three releases). The headline anchor is unchanged from the BCIS national band; site-by-site labour rates and material lead times do most of the work.
Common barn types
- Stone threshing barns: Dartmoor granite, Devon limestone, Cotswold-adjacent.
- Cob and stone composite: distinctive South West construction, requires lime-based specialism.
- Timber Dutch barns: post-war agricultural improvement era.
Specialists active in the region
Listed-building specialists: Jonathan Rhind Architects in North Devon. Contemporary design: Nordbarn portfolio includes South West projects.
Sources cited on this page