Open-Plan Conversions St Albans

GS Renovation opens St Albans houses into single connected spaces, taking out internal walls and replacing them with designed structural support. Terraced and postwar stock here was built as small separate rooms, so joining them is a structural project rather than a decorative one. We appoint the structural engineer and coordinate the inspections.

For St Albans, on London-derived ranges a knock-through finished as one room typically costs £3,000 to £8,000 or more, including the steel beam; Hertfordshire work generally runs below that. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in St Albans: the structural engineer we appoint designs the steel, we install it, and building control signs it off.

How the job runs

1. Free site survey at your St Albans address, covering the walls, services and floor levels, and an itemised quote.
2. The engineer we appoint sizes the beam, and the work is registered with St Albans and Watford building control or an approved inspector. On a shared wall you serve the party wall notice as building owner; we supply the drawings.
3. Props in, opening cut, beam on padstones; then floors, heating and electrics are joined up.
4. Building control inspects the steel before it is covered. We finish the room, and the completion certificate follows.

The St Albans layouts that suit opening up

Terraced houses and postwar estate housing are the layouts an open plan conversion suits, and St Albans has concentrations of both. Terraced houses account for 880 of the 2,840 dwellings in the Camp and Cunningham area, 31.0 per cent of that area's stock. In Townsend and New Greens, 1,080 of 3,070 dwellings, 35.2 per cent, were built between 1945 and 1954.

Both forms were built with the kitchen shut off from the rear reception room by a wall that is part of the structure. Opening that through is a beam job. The engineer we appoint works out what the wall carries, sizes the steel and designs the bearings at each end. We prop, cut in stages, and seat the beam before the props come out.

Housing in St Albans

Roughly 29,270 dwellings sit on the valuation list for St Albans. 69% are houses and 32% flats, and by age 19% predate 1919, 17% are interwar and 63% post-war. Terraced houses make up 27% of homes here, and opening up a terrace in St Albans usually lands one beam end on the party wall.

Interwar semis need the same treatment

1930s semi detached houses are the other form suited to opening up, and two St Albans areas record heavy 1930s stock. In Bernards Heath, 740 dwellings, 28.2 per cent of that area's stock, were built between 1930 and 1939. In the Longacres area, 740 of 2,560 dwellings, 28.9 per cent, were built in the same decade.

In a 1930s semi the wall between the two reception rooms can also carry a chimney breast above it, so the beam picks up more than the floor. Where a new beam bears into a party wall, the party wall route applies and you, as building owner, serve notice before work starts. We are contractors, not party wall surveyors, so where a surveyor is needed we say so rather than working outside our scope.

The inspection stages an open plan job passes through

St Albans building control inspects at set stages: commencement, foundations excavated, damp proof course or tanking, oversite, drains laid, floor joists, steelwork, roof carcass, insulation, windows and completion. An internal open plan conversion will not touch every one of those, but it will touch steelwork, and it will touch completion.

Steelwork is listed in its own right, after floor joists and before roof carcass. That is the stage that governs the programme, because the beam and its bearings have to be visible when the surveyor attends. We sequence the making good behind that visit, so nothing is boarded, boxed or plastered over a bearing that has not been seen.

• Utility and boot room space carved out of the new layout
• Knock-throughs between front and rear reception rooms
• Zoned lighting circuits and dimming for a multi-use room

VOA Council Tax stock of properties, March 2025, for all 9 statistical areas in St Albans. Counts rounded by the VOA.

If you are weighing up options for your St Albans property, it is worth reading home renovation in St Albans, open-plan conversion in Harpenden, side return infills, converting a garage into living space, how we handle open-plan conversion across London and Maximising Natural Light.

Why Choose GS Renovation in St Albans

St Albans open plan work starts from terraced and postwar layouts built as separate small rooms, so the value is in establishing what the dividing wall carries before it is touched. We appoint the structural engineer, build to the calculations, and hold the making good back until the steelwork stage has been inspected. Fully insured, building control applications and inspections coordinated, free no obligation quotations and one point of contact.

Reviewed jobs near St Albans

2 MyBuilder reviews from St Albans, with each customer's own job title:

• Downstairs toilet fitting, St Albans, 24 Jan 2018 (1 out of 5)
• Complete new bathroom inc tiling walls & floor, St Albans, 20 Nov 2017 (5 out of 5)

Read all 31 on our reviews page.

Checked by Abdelaaziz Saaid, founder and director of GS Renovation Ltd (Companies House no. 14611254). Structural design is by the consulting engineer appointed to your project.