From simple knock throughs in terraces to wide goalpost frames in semis and detached houses.
RSJ Design • Manchester
RSJ Design Structural Engineer in Manchester
We specialise in RSJ design Manchester, steel beam calculations Manchester and structural calculations Manchester for wall removals, knock throughs and extensions across Greater Manchester. Building Control ready designs with fixed fees and a typical turnaround of 24 to 72 hours once we have your information.
- Chartered structural engineers designing RSJs every day for Manchester homes.
- Full calculation pack ready for Building Control, your builder and your records.
- Optimised steel sizes for safe, efficient and cost effective beams that your fabricator can supply easily.
Serving Greater Manchester and nearby towns including Didsbury, Chorlton, Sale, Altrincham, Stockport, Salford and Bury.
For most domestic RSJ designs and steel beam calculations once drawings and measurements arrive.
Every RSJ design and structural calculation is completed or checked by a Chartered Structural Engineer.
RSJ design Manchester and steel beam services
Focused on the real projects Greater Manchester homeowners, builders and architects carry out every week.
RSJ beams for open plan layouts
RSJ design and structural calculations for kitchen knock throughs, lounge openings and new doorways in terraces and semis across Manchester.
- Single RSJ over a new opening
- Linked beams over two openings
- Goalpost frames for wide spans
Steelwork for rear and side extensions
Steel beam calculations Manchester for single and two storey rear or side extensions, including large glazing and bi fold doors.
- Beams over bi fold or patio doors
- Steel supporting new masonry or timber roofs
- Padstone and bearing checks included
Loft RSJs and cranked beams
Structural calculations Manchester for dormers and loft conversions in Victorian, Edwardian and 1930s roofs around Greater Manchester.
- Cranked beams picking up new joists
- Ridge beams and purlin support steel
- Support checks on existing walls
Chimney breast removal steel
RSJ design when removing one or more chimney breasts from a room or floor in Manchester properties.
- Beams at floor level under the remaining stack
- Load paths checked down to foundations
- Notes for safe removal sequence
Steel posts, padstones and simple frames
When loads cannot sit on existing walls we design SHS posts, padstones and simple frames to carry the RSJ safely.
- SHS posts under beams and lintels
- Concrete padstone sizing
- Simple connection notes for site
Structural checks and RSJ reports
Independent structural calculations and reports where records are missing, layouts have changed or lenders request confirmation.
- Calculations for existing beams
- Reports for solicitors or lenders
- Support with Building Control queries
Simple four step RSJ design process
Clear steps from first enquiry through to the final steel beam calculation pack.
Send photos, basic measurements and any plans. A quick call helps confirm the layout and loads.
You receive a clear fixed fee and scope before we start any RSJ design or structural calculations.
A structural engineer designs the beam, checks loads and deflection and prepares the calculation pack.
You get drawings and calculations ready for your builder, fabricator and Building Control officer.
What Manchester clients say
Homeowners and builders who wanted RSJ designs and steel beam calculations that work first time on site.
We needed an RSJ design for a kitchen knock through in a red brick terrace in Chorlton. The engineer explained the options clearly and Building Control passed it without any issues.
Our builder asked for proper steel beam calculations before ordering the RSJs for a rear extension in Sale. The pack arrived within two days with padstone sizes and notes that were easy to follow.
Loft conversion in a 1930s semi in Prestwich. The structural calculations picked up a few issues early so our architect could tweak the layout before the builder started.
Frequently asked questions
Quick answers to the questions Manchester homeowners ask about RSJ design, steel beam calculations and structural calculations.
What is the typical turnaround time?
Most RSJ or wall removal calculations are completed within 24 to 72 hours once we have clear drawings, measurements and photos. Larger projects such as full extension or loft packages usually take five to seven working days.
Do you handle Building Control submissions?
We provide a full calculation pack ready for Building Control. You or your architect normally submit the application, but we can support you and answer any technical questions from your Building Control officer.
Can you work from photos only?
Many domestic RSJ designs in Greater Manchester can be completed from good photos, measurements and existing plans. Where access is tricky or structure is unclear, we may advise a site visit before final calculations.
What information do you need for a quote?
Your property address, a short description of the work, clear photos and basic measurements of the wall or opening. If you have architect plans or sketches, send those as well and we will review everything together.
Send your photos and a quick description and we will respond with a fixed fee, expected turnaround and the right level of structural calculations for your project.
Request a RSJ design quote
Use this form to outline your project in Manchester or the surrounding area. The details come straight to our engineering inbox.
Tell us about your project
Share a few details so we can review the layout and confirm the right RSJ design service, steel beam calculations and fixed fee.
Your enquiry goes direct to our engineering team. We usually reply within one working day.

- Head Office: Corwell Lane, Uxbridge, England, UB8 3DE.
- 07359 267907
- info@structuralengineercalcs.com
- Company No: 12653163
