UK RSJ calculator
RSJ Beam Cost Calculator
Estimate the cost of a common 1–5 metre RSJ beam and installation using August 2026 UK benchmarks, with optional structural engineer allowance and postcode-aware labour modelling.
Enter a postcode to set the cost region automatically.
Estimated RSJ supply & installation budget
£1,291 – £1,429Typical planning estimate £1,360. Wall demolition, padstones, lifting equipment, building control and making good may be additional.
Benchmark source: Checkatrade RSJ cost guide, updated August 2026. Structural design, demolition, padstones, lifting, building control and making good should be confirmed separately. See sources →