Steel beam installation, RSJ and structural alterations in Hertford. Trusted, professional, 30+ years' hands-on experience.
An RSJ in a Hertford house is a building regulations job before it is a building job. A structural engineer we appoint produces the calculations, and the beam, padstones and bearings are built to what that engineer specifies. What the wall is made of, and what sits under the house, decide the detail.

Your building regulations application does not go to East Herts District Council. The council does not run building control in house. The service is provided by Hertfordshire Building Control, which East Herts owns jointly with seven other Hertfordshire local authorities. Applications are submitted online through the Hertfordshire Building Control portal at submitaplan.com, and the operations team number is 01438 879990. We coordinate that application and the inspections that follow, so you have one point of contact rather than chasing a sign off yourself.
Numbers 22 to 40 Bengeo Street are built in rat trap bond, which the council describes as bricks laid on edge. The conservation area appraisal calls it an unusual bonding, and it says the brickwork should not be painted or rendered over.
Bricks laid on edge are not the same bearing material as solid bonded brickwork. Where a wall is built that way, the engineer needs to see it opened up before the bearing detail is fixed, not after the props are in. The making good has to follow the appraisal too, so the face brickwork is reinstated rather than covered.
The ground changes street by street in central Hertford. British Geological Survey 1:50,000 mapping shows Kempton Park Gravel Member sand and gravel over the chalk at Salisbury Square, Market Place, Maidenhead Street, Bull Plain and the western end of Fore Street. At the eastern end of Fore Street and at Old Cross the mapping is alluvium. Chalk is mapped at the surface only in pockets, for example around Castle Street.
On the valley floors the mapping is alluvium of clay, silt, sand and gravel above the chalk. That covers Hartham Common, the Beane at Horns Mill and North Road, and the northern end of Port Vale. At Hertford North station itself the mapping is Kesgrave Catchment Subgroup sand and gravel. All of that matters where a beam lands on a new pier and the load has to be carried down to a foundation.
A beam is one of the few jobs where the order cannot be shuffled. The engineer is appointed and the sizes are calculated before anything is ordered. The building regulations application then goes to Hertfordshire Building Control, and the inspector wants to see the bearings before they are covered. We handle the appointment, the application and the inspection bookings in that sequence. GS Renovation is fully insured and registered in England, company number 14611254.
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FAQ
Set aside the structural element, the finishing trades and the approvals as three separate amounts. That is how the RSJ and steel beam installation quotation for a Hertford home is laid out, and it is why the SG13 survey happens before any figure is discussed. The engineer's fee, where RSJ and steel beam installation needs a design, is shown rather than buried. Ask GS Renovation on 07472 424 226 for the current position in Hertford. The survey at the SG13 property is free, in Hertford and across Hertford. As a rough guide, RSJ and steel beam installation in London runs roughly £1,500 to £4,000 for the beam itself on a single straightforward opening, covering supply, installation and building control sign-off; a full knock-through including taking the wall out, the structural engineer's fee and making good more typically comes to £2,500 to £6,500 or more (indicative London ranges, MyBuilder and Checkatrade, 2026). Your figure depends on the size, specification and condition of the property, which is why we survey before quoting.
The beam itself is a building regulations matter, because it sits inside the house. Planning enters where masonry outside comes down. In a conservation area, permission is needed to demolish walls and railings 1 metre or more high abutting a highway, footpath, bridleway, waterway or open space, or 2 metres or more elsewhere. The 2017 appraisal also records nearly 280 listed building groups inside the area, and listed status brings internal work in as well.
Chalk, directly beneath the ground. British Geological Survey 1:50,000 mapping shows no superficial deposit at all across the Foxholes estate. That is unlike Port Hill, Bengeo Street, Sele Farm, Cherry Tree Green, Sele Road and Thieves Lane, where Kesgrave Catchment Subgroup sand and gravel lies above the chalk. A pier carrying a beam end has to reach material that can take the load. The engineer sets that depth for your plot and we build to it.
It can, because the bedrock there is not chalk. Under the built up part of town the British Geological Survey maps Lewes Nodular and Seaford Chalk, undifferentiated. In the south east it maps Lambeth Group clay, silt and sand instead, taking in the south east end of Mangrove Road, the southern part of Balls Park, London Road and Foxholes Business Park. Clay and chalk behave differently under load, so the foundation detail follows the engineer's investigation.
Yes, a retained stack is a load the engineer counts. The conservation area appraisal describes numbers 65 to 89 Port Vale as a late 19th century terrace with prominent chimneys, and a stack like that carries weight down through the house. The beam is sized for everything above it, including masonry that stays. What is retained gets propped while the opening is formed, and the bearings are left exposed for the inspector.
No. The first stage of the estate covered Cherry Tree Green, Hawthorn Close, Bramfield Road, Tudor Way, Windsor Drive, Hollycroft and Welwyn Road, and the Sele plan describes the ward's predominant architectural style as modern. A repeated house type is a starting point at survey, not a substitute for calculations. Alterations and re-roofing since the build change what a wall carries, so the engineer measures your house.
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