Rates are UK national (non-London): central London and constrained urban sites typically run dearer — adjust the labour, plant and access lines in the build-up accordingly.
140mm lightweight-aggregate 7.3N blockwork
per m² · supply & lay
£94 – £151 / m²
What is it
The supply and laying of a single skin of 140 mm lightweight-aggregate blockwork of 7.3 N/mm² grade to a vertical wall, priced per m² of wall face. A load-bearing lightweight expanded-clay aggregate block — for inner leaves and party walls that want the strength of a 7.3 N unit with lighter weight and better insulation than dense aggregate. Laid on traditional sand-cement mortar. One finish is priced:
Standard — a common-face block, to be plastered, rendered, painted or dry-lined; the usual choice and the default rate.
Rate range by wall complexity
Simple£94 – £122 / m²
Standard£104 – £134 / m²
Complex£117 – £151 / m²
Budget rate per m².
3 key cost drivers
Wall complexity
Openings, returns, piers and reveals slow the gang and add cutting waste. It is a key driver of the rate.
Wall thickness
This rate is for a 140 mm lightweight-aggregate block. A thicker block is a dearer unit and beds in more mortar than the 100 mm leaf; the ultra-light aggregate block lays a touch faster than dense. Thickness is a key driver of material cost.
Location
London and the South East typically add around 20% to labour.
Estimator
Budget rate generator
£104 – £134 / m²
Covers 140 mm lightweight-aggregate 7.3N blocks, bedding mortar, the laying gang and O&P · excl. prelims, scaffold & VAT
Exclusions
Lifting & material distribution — telehandler / forklift, hoist and site-distribution labour (an attendance, in main-contractor prelims)
DPC, lintels, wall ties & cavity insulation, movement joints
Wall finishes — plaster, render or dry-lining
Scaffold supply (usually in preliminaries)
Preliminaries — main-contractor site set-up, management & welfare