Basement & cellar steels · Lisburn and Castlereagh
Basement & cellar steels in Lisburn and Castlereagh
Survey, engineer's design and installation of basement & cellar steels anywhere in Lisburn and Castlereagh.
- Survey, design and installation in one
- Covering BT16, BT17, BT26, BT27
- 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 Lisburn and Castlereagh
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.
From the first survey visit to the completion certificate, we take care of basement & cellar steels across Lisburn and Castlereagh. That includes Lisburn, plus smaller towns and villages nearby. The engineer sizes the steel, we deal with Lisburn and Castlereagh City Council, and our team fits and packs the beam before making good.
Worth knowing before you start
- Converting a cellar into a habitable room is building work needing building regulations approval, covering structure, fire escape, ventilation and damp protection. Digging out a new basement may also need planning permission, depending on the council and the scale of the work.
- 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.
- Basement steel frames often rely on columns because there is nowhere else to land the load. Each column sits on its own foundation or a thickened part of the slab, and its position needs agreeing early so it does not end up in the middle of a room.
- 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.
- Below-ground rooms need a waterproofing design, often a cavity drain membrane, a tanking system or both. Column bases and beam bearings that pass through the waterproofing are detailed so they do not become a route for water.
From survey to sign-off in Lisburn and Castlereagh
Free visit
A short visit to Lisburn and Castlereagh 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 Lisburn and Castlereagh City 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.
What do basement & cellar steels cost in Lisburn and Castlereagh?
As a guide, budget £2,150–£5,600 including VAT for basement or cellar steelwork in Lisburn and Castlereagh, 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) |
| Building control fees | £220–£560 | Building notice or full plans fee and inspections; varies by council or approver |
| Structural calculations for a beam | £220–£640 | Site measure or photos, beam and padstone design and calculations for building control |
Figures include our approximate regional adjustment for prices in Northern Ireland (-14%) and are rounded. How these figures are worked out.
Building control and neighbours in Lisburn and Castlereagh
Removing a load-bearing wall in Northern Ireland needs building control approval from the council. Lisburn and Castlereagh City Council covers Lisburn and Castlereagh. The engineer's calculations support the application, and a completion certificate is issued after the final inspection.
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
Basement & cellar steels in Lisburn and Castlereagh: your questions
Can you work on older or listed homes in Lisburn and Castlereagh?
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 long does it take to fit steels in a basement?
Each stage of steelwork usually takes a few days, but it happens at several points through a basement project rather than all at once. The overall programme is set by the excavation, underpinning and waterproofing, and the steel is installed whenever the sequence reaches it.
Can I stay at home while basement steels are installed?
Many people do, particularly for cellar conversions where the dig is limited. Expect noise, dust and deliveries during the heavier stages, and some rooms above may be out of use while props are in place. For large excavations, moving out for part of the programme can be more comfortable.
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 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.