Nationwide RSJ Design & Structural Calculations
Building Control-approved calculations for homeowners and builders. Get fast, fixed-fee engineering for extensions, lofts, and wall removals without a site visit.
Local Engineering Hubs
Select your nearest city for specific advice on local soil conditions and housing stock.
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National Design Standards
Unlike generic online calculators, our designs are fully engineered to UK Building Regulations (Approved Document A) and British Standards. Here is the technical specification we apply to every job.
Codes of Practice
- BS EN 1993-1-1 (Eurocode 3): Design of steel structures. We calculate bending moment, shear resistance, and lateral torsional buckling.
- BS EN 1991-1-1 (Eurocode 1): Actions on structures. We apply accurate dead loads (masonry, timber) and live loads (residential occupancy).
- Approved Document A: All calculations satisfy Requirement A1 (Loading) of the Building Regulations for England & Wales.
Steel & Material Specs
- Steel Grade S355 vs S275: We usually default to S355JR for higher strength-to-weight ratios, saving headroom in lofts.
- Deflection Limits: Strict serviceability checks (Span/360 for live loads) to prevent plaster cracking.
- Padstones: Concrete padstones (C35/40 mix) sized to distribute loads into existing brickwork without crushing.
Structural Projects We Engineer
We focus on the most common structural alterations for UK homes.
Wall Removals & Knock-throughs
Calculations for single beams or box frames to create open-plan kitchen diners.
Rear & Side Extensions
Steel beam design for extensions, including lintels for bi-fold doors and roof supports.
Loft Conversions
Ridge beams, floor joists, and cranked steels designed to maximise headroom.
Chimney Support
Steel beams or gallows brackets to support the stack when removing a chimney breast.
Steel Posts & Frames
Moment frames and steel posts for areas where masonry walls cannot support the load.
Structural Reports
Retrospective calculations for existing work to satisfy lenders or Building Control.
- Head Office: Corwell Lane, Uxbridge, England, UB8 3DE.
- 07359 267907
- info@structuralengineercalcs.com
- Company No: 12653163