Gwynedd · Wales
Steel beam installers in Porthmadog
RSJs and steel beams for homes and businesses in Porthmadog, with calculations, approvals, propping and making good.
- Price fixed in writing once scope is agreed
- Building control arranged
- Temporary works and making good included
- Free survey visit
- Engineer's calculations arranged
- Building control handled
- Fixed written price once scope is agreed
- England, Wales, mainland Scotland & NI
Steel beam work in Porthmadog
We install steel beams and RSJs in Porthmadog, covering LL47, LL48 and LL49. We also cover the surrounding towns and villages in Gwynedd. Common jobs here are knock-throughs, load-bearing wall removal, chimney breasts and openings into new extensions.
In Porthmadog, beam work is approved under the Building Regulations as they apply in Wales, and the Party Wall etc. Act 1996 applies to shared walls.
Services in Porthmadog
Wall removal & knock-throughs
- Load-bearing wall removal
- Kitchen-diner knock-throughs
- Through-lounge knock-throughs
- Chimney breast removal
New & wider openings
- Wider doorways & openings
- Bi-fold & sliding door openings
- Garage conversion openings
- Lintel replacement
Extensions, lofts & basements
Beams, frames & columns
Design & approvals
- Structural calculations
- Building control sign-off
- Party wall beam works
- Fire protection for steel beams
Site works & commercial
How the job runs in Porthmadog
Survey in Porthmadog
We visit, look at the wall and what sits above it, measure the opening and note services, access and how the steel can be brought in.
Engineer's design
A structural engineer sizes the beam, padstones and any posts, and sets out the temporary support needed while the wall is out.
Building control
We submit the application or notice to Cyngor Gwynedd under the Building Regulations as they apply in Wales, before work starts.
Install and sign-off
Props go in, the opening is formed, the steel is set and packed, building control inspects it, and we make good.
Guide prices in Porthmadog
As a guide, budget £1,800–£4,550 including VAT for load-bearing wall removal with steel beam in Porthmadog, based on published UK cost guides adjusted for prices in Wales (-9%).
| Job | Typical guide range | What it usually covers |
|---|---|---|
| Load-bearing wall removal with steel beam | £1,800–£4,550 | Typical internal wall up to about 4 m: calculations, building control, propping, steel, padstones, fitting, fire protection and making good |
| Chimney breast removal (ground floor) | £1,350–£2,750 | Ground-floor breast removed, steel to support the breast above, building control and making good |
| Rear wall opening for bi-fold or sliding doors | £2,300–£6,350 | External wall opened up to about 5 m with steel, propping, cavity tray and making good (doors supplied separately) |
| Loft conversion steels | £2,300–£5,450 | Supply and fit of floor and ridge steels on padstones, including lifting into the roof space |
| Structural calculations for a beam | £230–£680 | Site measure or photos, beam and padstone design and calculations for building control |
Figures include our approximate regional adjustment for prices in Wales (-9%) and are rounded. How these figures are worked out.
Building rules in Porthmadog
In Wales, structural alterations come under the Building Regulations 2010 as they apply in Wales. Cyngor Gwynedd handles building control for Porthmadog. For work started or approved from 1 July 2026, the Welsh system uses an application to building control, dutyholders appointed in writing, a commencement notice before work starts and a compliance statement at the end.
The Party Wall etc. Act 1996 applies in Wales as well as England, so a beam bearing into a shared wall needs a party structure notice at least two months before work starts. We arrange notices through a party wall surveyor.
Near Porthmadog
- Pwllheli 12.2 mi
- Caernarfon 15.8 mi
- Dolgellau 16.5 mi
- Bangor 20.7 mi
- Menai Bridge 20.7 mi
- Bala 22.4 mi
Steel beams in Porthmadog: questions
Who approves steel beam installation in Porthmadog?
Structural work in Porthmadog needs a building control application to Cyngor Gwynedd under the Welsh regulations, with a commencement notice before work starts. We prepare and submit it with the structural engineer's calculations and arrange the inspections, so the completion paperwork follows the job.
Do you also work near Porthmadog?
Yes. We also cover nearby towns including Pwllheli, Caernarfon, Dolgellau and Bangor.
Can you work on older or listed homes in Porthmadog?
Yes. Older homes often have lime mortar, timber lintels or shallow footings, which the engineer allows for. Listed buildings need listed building consent for internal structural changes as well as building regulations approval, and that must be in place first.
How soon can steel beam installation start in Porthmadog?
Start dates depend on the engineer's calculations, the building control approval and, where needed, party wall notice periods. We give you a realistic timetable after the survey and keep you updated as each approval comes through.
Do I need a party wall agreement for steel beam installation in Porthmadog?
Yes, if the beam bears into a shared wall: the Party Wall etc. Act 1996 applies in England and Wales, and a party structure notice must be served at least two months before that work starts. We arrange it through a party wall surveyor.