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.
100mm aircrete 7.3N blockwork
per m² · supply & lay
£74 – £122 / m²
What is it
The supply and laying of a single skin of 100 mm aircrete blockwork of 7.3 N/mm² grade, priced per m² of wall face. Aircrete is the lightest walling block, full of trapped air, so it lays fast, cuts easily and insulates well, and the 7.3N grade is the high-strength version, carrying load for a load-bearing inner leaf or partition. Two jointing systems cover most jobs:
Traditional — site-mixed sand-cement mortar with 10 mm joints; the common method and the default rate.
Thin-joint — a 2–3 mm thin-bed adhesive instead of mortar; faster laying on repetitive walls for a small extra material cost.
Rate range by wall complexity
Simple£74 – £100 / m²
Standard£80 – £109 / m²
Complex£88 – £122 / 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.
Block supply & price
The high-strength aircrete block is roughly half the cost. With the 7.3N specification fixed, its price moves with the market and is carried in the band rather than a dropdown.
Location
London and the South East typically add around 20% to labour.
Estimator
Budget rate generator
£85 – £109 / m²
Covers 100 mm high-strength aircrete blocks, bedding mortar or thin-joint adhesive, the laying gang and O&P · excl. prelims, scaffold & VAT · thin-joint adhesive price is a dated model estimate — a default to replace with your own quote
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