Basement & cellar steels · Mid and East Antrim
Basement & cellar steels in Mid and East Antrim
Basement & cellar steels across Mid and East Antrim, designed by a structural engineer and signed off by building control.
- Survey, design and installation in one
- Covering BT38, BT40, BT42, BT43
- Inspected before it is covered
- Free survey visit
- Engineer's calculations arranged
- Building control handled
- Fixed written price once scope is agreed
- England, Wales, mainland Scotland & NI
Planning basement & cellar steels in Mid and East Antrim
Basement and cellar steels are the beams and columns that hold up the house above when walls are removed, openings are formed or new space is dug out below ground level. They carry the ground floor and walls down to new foundations, and are installed in a sequence set out by a structural engineer, alongside underpinning, excavation and waterproofing.
If you are planning basement & cellar steels in Mid and East Antrim, the order of work matters as much as the steel: survey, calculations, approval, propping, installation, inspection and making good. We can survey in places such as Ballymena, Carrickfergus and Larne and the villages around them. We run that sequence for you as one job with one point of contact.
Key points for your project
- A basement room needs a safe way out in a fire, which affects the stair, the doors and sometimes an escape window into a lightwell. Steel in the basement ceiling also commonly needs fire protection to the standard building control asks for.
- Victorian and Edwardian cellars often have shallow brick walls, vaulted coal stores extending under the front garden or pavement, and little or no damp protection. The engineer checks whether vaults and walls can stay and what new support they need.
- Getting steel into a basement means lowering it through a lightwell, a stair opening or a temporary hole in the ground floor. Long beams may be designed in bolted sections so they can be handled in tight below-ground spaces.
- Underpinning deepens the existing foundations so walls can go lower, and a specialist carries it out in a strict bay-by-bay sequence. Steelwork has to fit around that sequence, which is why the engineer plans the two together from the start.
- Temporary works for basements are more involved than for a single opening. The design covers propping the house above, supporting the sides of the excavation, and keeping loads off freshly cast concrete until it has gained strength.
From survey to sign-off in Mid and East Antrim
Free visit
A short visit to Mid and East Antrim to see the job, agree what you want and check the bearings, floors and services that affect the design.
Calculations
The engineer's calculations and a simple drawing are prepared for your opening and shared with you before anything is ordered.
Building control
A full plans application or building notice goes to Mid and East Antrim Borough Council under the Building Regulations (Northern Ireland) 2012 before work begins.
Steel in, made good
On site we prop, open up, fit and pack the steel, then fire protect, box in and plaster once the inspection is done.
Guide prices for basement & cellar steels in Mid and East Antrim
As a guide, budget £2,150–£5,600 including VAT for basement or cellar steelwork in Mid and East Antrim, based on published UK cost guides adjusted for prices in Northern Ireland (-14%).
| Job | Typical guide range | What it usually covers |
|---|---|---|
| Basement or cellar steelwork | £2,150–£5,600 | Beams and columns with pad foundations under the floor above (excavation and waterproofing extra) |
| Structural calculations for a beam | £220–£640 | Site measure or photos, beam and padstone design and calculations for building control |
| Building control fees | £220–£560 | Building notice or full plans fee and inspections; varies by council or approver |
Figures include our approximate regional adjustment for prices in Northern Ireland (-14%) and are rounded. How these figures are worked out.
Building rules for Mid and East Antrim
In Northern Ireland, structural work comes under the Building Regulations (Northern Ireland) 2012 and is approved by the local council's building control. For Mid and East Antrim that is Mid and East Antrim Borough Council. We submit a full plans application or building notice before work starts and book the inspections.
Northern Ireland has no Party Wall Act, so there is no statutory notice to serve. Where the steel bears into a shared wall, the title deeds and the general law apply, and agreeing the work with your neighbour in writing first is good practice.
Basement & cellar steels by town
Local questions answered
Which towns in Mid and East Antrim do you cover?
We cover towns including Carrickfergus, Ballymena and Larne, plus the villages and smaller towns around them.
Can I stay at home while the work is done in Mid and East Antrim?
Usually, yes. The work area is screened and floors are protected. The rooms either side of the opening are out of action for a few days, and there is some noise and dust while the masonry comes out.
Do I need planning permission to convert a cellar?
Converting an existing cellar into living space usually does not need planning permission if the outside of the house is unchanged, though listed buildings need consent. Digging a new basement, extending under the garden or adding lightwells may need planning permission, and building regulations approval is needed either way.
Do I need steel beams for a cellar conversion?
Often, yes. If any cellar walls are being removed or opened up, or the ground floor above is being altered for a stair or lightwell, steel beams and columns are usually needed to carry the house above. A structural engineer looks at the layout and loads and specifies the steelwork.
How is steel protected from damp in a basement?
Steel below ground is protected against corrosion as the engineer specifies, which may mean a heavier-duty paint system or galvanising. It is also kept on the dry side of the waterproofing where possible, and fixings through the waterproofing are detailed so they do not let water in.
Do you do the underpinning for a basement?
Underpinning is specialist work, and we coordinate the steelwork with the underpinning contractor rather than carrying it out ourselves. The engineer designs the steel and the underpinning sequence together, so beams, columns and new foundations fit the order in which the walls are deepened.
Do you cover Mid and East Antrim for basement & cellar steels?
Yes. We carry out basement & cellar steels in Mid and East Antrim. Book a free survey visit and we will check the wall, arrange the engineer's calculations and send an itemised written quote.