Underpinning in Bangor
Surveys, design, and installation across Bangor and surrounding towns.
- UK-wide coverage and local knowledge
- 20 year remedial warranty
- Diagnostics to remedial work
Our Bangor team handles foundation repair across the wider Gwynedd area. We regularly work in Caernarfon, Llandudno, Colwyn Bay and Holyhead, on Victorian terraces, semi-detached houses, modern builds, and commercial properties.
Local coverage
Every job starts with a free site survey. A chartered structural engineer signs off the design before any work begins, and the installation is backed by a 10-year workmanship guarantee.
Ground conditions in Bangor
low prevalenceCarboniferous Limestone, sandstones, and glacial till over much of the region.
Bedrock is generally close to the surface and competent.
- Limestone and sandstone bedrock
- Glacial till
- Coastal alluvium in places
Methods we use locally
The right method depends on soil conditions, depth of failure, and access on site. The engineer's design decides, these are the options on the table for Bangor properties.
| Method | Time on site | Best for in Bangor |
|---|---|---|
|
Beam and base
Reinforced concrete beams that spread the load. |
2 to 6 weeks | Variable ground, bay windows, redistributing loads. Common on bay windows and settled extensions through Colwyn Bay and Holyhead where loads need redistributing along a single elevation. |
|
Foam injection
Lightweight stabilisation that works to depth. |
1 day for most jobs | Slab re-levelling, void fill, conservatory bases. Useful for re-levelling slabs and floors in Holyhead and Caernarfon, where access for excavation is tight and disruption must be kept low. |
|
Mass concrete
The traditional method, done properly. |
2 to 6 weeks per elevation | Shallow failures on traditional ground, insurance claims. Well-suited to traditional brick properties across Bangor, Caernarfon and Llandudno where shallow bays can reach competent ground by hand. |
|
Mini piled
When the good ground is a long way down. |
1 to 3 weeks on site | Deep bearing layers, made-up ground, restricted access. The usual answer for deep clay or made-up ground around Bangor and Caernarfon, and for rear-only access through the property. |
|
Resin injection
Targeted ground improvement, no excavation. |
1 day for most jobs | Granular soils, intact foundations, voids and density loss. Quick non-disruptive fix for shallow void filling and ground stabilisation across Gwynedd, suited to lighter loads in Caernarfon and Colwyn Bay. |
|
Screw pile
Helical piles, no concrete cure time. |
2 to 5 days | Lighter loads, time-critical jobs, conservatories. Low-vibration option for terraces close to neighbours in Llandudno and Llandudno, with quick installation and minimal spoil. |
Areas we cover near Bangor
Common questions
Need an opinion on a Bangor property?
A surveyor will be in touch within 48 hours.