Northern Ireland
Basement Tanking in Londonderry
Cementitious tanking and cavity drain systems for basements, cellars and below-ground rooms.
Basement Tanking in Londonderry is work we take on regularly, and the Londonderry housing stock is a big part of why.
The prevailing picture in Londonderry is Victorian terraces, harled cottages and exposed north-coast housing. That means driving rain and salt on north-coast properties comes up more here than almost anywhere else. The area sees wet with severe Atlantic exposure on the north coast, which is the single biggest factor in how long any render lasts here.
Local factor. The north coast around portstewart takes direct atlantic weather, and dash finishes substantially outperform smooth render there.
Is basement tanking right for a Londonderry property?
Choose tanking for cellar and basement conversions, persistently wet below-ground rooms, and any space you intend to make habitable.
That decision gets made at the survey, not on the phone. We will tell you plainly if a different system would serve the building better — including when a cheaper one would.
Guide price and specification
| Guide price | £115–£195 per m² |
|---|---|
| Applied thickness | Multi-coat cementitious system |
| Curing / drying | 7-14 days |
| Guarantee | 20 years |
| Coverage | All of Londonderry — 6 towns and cities |
Indicative only, excluding scaffold, stripping and repairs. Try the guide-price tool for a range based on your property.
What is included
- Cementitious tanking slurries
- Cavity drain membrane systems
- Sump and pump installation
- Type A and Type C waterproofing
- Fillets and junction detailing
- Withstands hydrostatic pressure
- Suitable for habitable conversion
- Salt and negative pressure resistant
Basement Tanking across Londonderry
Basement Tanking in Londonderry
Tell us about the property and we will call you back to arrange a survey.
Other services in Londonderry
What happens next
Four steps from enquiry to finished wall
Free survey
We visit, test the substrate, measure up and identify what caused any existing failure.
Written quote
An itemised fixed price with the system named, materials specified and scaffold included.
Booked in
An agreed start date, scaffold arranged, and a clear run of days set aside for your job.
Finished and guaranteed
Site cleared, scaffold struck, guarantee documents and system warranty issued.
FAQs
Basement Tanking in Londonderry — questions
Will you need scaffolding?
For anything above single storey, yes — it is safer and produces a better finish than working off ladders or towers. Scaffold is included and itemised in the quote.
How long before I can paint new render?
Through-coloured systems need no painting at all. Sand and cement should cure for around 28 days before masonry paint goes anywhere near it.
Do you take a deposit?
For most domestic jobs we take a deposit to cover materials and scaffold, with the balance on completion. Terms are set out clearly in the written quote.
Can you match my existing render?
Usually, yes. We colour and texture match as closely as we can, though weathered render never matches a fresh batch exactly — we will be honest about how visible a patch will be.
Can any cellar be tanked?
Most can, but the right system depends on water pressure, structural condition and intended use. A survey establishes which approach is appropriate.
How long does basement tanking last?
A correctly designed and installed system carries a 20-year warranty. Type C systems need periodic pump servicing to maintain that.
Basement Tanking quotes across Londonderry
Free survey, honest advice on whether this is the right system, and a fixed written price.