01 Jun Planning Your Foundation Projects for Summer: Tips for Homeowners and Developers
Summer is one of the most practical times of year to tackle foundation works, structural repairs, piling, underpinning or basement construction. Longer daylight hours, generally better weather and easier site access can all help projects move more efficiently. But summer is also a busy period for contractors, surveyors and developers, so early planning is essential.
For homeowners considering an extension, basement, refurbishment or remedial structural work, and for developers preparing new-build or conversion projects, the foundations should never be treated as an afterthought. They are the part of the project that determines whether everything above ground performs as intended.
Why foundation Planning Matters in the Summer
Warm, dry weather can make construction easier, but it can also expose foundation problems. The Association of British Insurers (ABI) reported that subsidence-related insurance claims totalled £153 million in the first half of 2025, supporting almost 9,000 households, with an average payout of £17,264 per claim. Subsidence typically occurs when soil loses moisture and contracts, often during prolonged dry spells or where trees and shrubs draw water from the ground.
This is especially relevant for properties built on clay-rich soils, older foundations, sites affected by drainage issues, or buildings close to mature trees. Cracks, sticking doors, sloping floors or gaps around window and door frames should be investigated before major works begin.
Six Key Steps for Successful Foundation Planning
1. Start with a proper site assessment
Before planning an extension, basement, new structure or remedial project, arrange for the ground and existing structure to be assessed. This should consider soil type, drainage, trees, nearby excavations, existing foundation depth and the proposed load of the new works.
A good site assessment helps identify potential risks before they become expensive problems. For existing buildings, the assessment should look at any visible signs of movement, such as cracking, uneven floors, sticking doors or gaps around frames. For new developments, it should confirm whether the proposed foundation type is suitable for the ground conditions and the intended structure.
2. Know when underpinning may be needed
Underpinning strengthens the foundations of an existing building. Traditional underpinning involves excavating beneath foundations in sections and filling them with concrete. Many domestic projects now use mini piling to transfer the building load to firmer subsoil.
Underpinning may be needed where:
- Subsidence has affected the property
- Original foundations are too shallow or inadequate
- Soil quality is poor
- Tree roots or drainage problems have affected the ground
- Extra load is being added through an extension, additional storey or basement
3. Consider piling where access or ground conditions are challenging
Piling can be a strong option for extensions, new structures, restricted-access sites and foundation reinforcement. Piling is often a preferred method for reinforcing foundations, especially where there is limited space to work. Screw piles can support light extensions, garages and porches, and can also be used for underpinning where only additional foundation strength is required.
Early piling design can help reduce project risk and avoid costly redesign once works are underway.
4. Plan around surveys, permissions and lead times
Summer schedules fill quickly. Before works begin, allow time for:
- Structural engineer input
- Soil investigations
- Drainage surveys
- Building control approval
- Access planning
- Temporary works design
- Contractor availability
Foundation work is often one of the earliest stages on site. If it is delayed, the rest of the project usually follows.
5. Do not ignore structural warning signs
If you notice cracks widening, doors or windows pulling away from frames, uneven floors or visible movement in masonry, take advice before starting cosmetic or extension works. Substantial cracks and frames pulling away from masonry can be signs of subsidence, although the correct solution depends on the cause.
In some cases, drainage repairs, root management or monitoring may be required before underpinning is considered. In others, delaying action can increase the scale and cost of repairs.
6. Think beyond the immediate project
A foundation project should support the long-term use of the property, not just the current works. Homeowners may want to future-proof for a loft conversion, basement, rear extension or heavier structure. Developers may need a solution that supports programme certainty, buildability and long-term performance.
Building on the Right Support
Summer is an excellent time to move forward with foundation projects, but only when the groundwork has been done properly. With subsidence claims, repair activity and construction cost pressures all affecting the UK market, early expert advice can help avoid delays, reduce risk and protect the value of the property.
Whether you are a homeowner planning an extension or basement, or a developer preparing a new-build, conversion or structural repair project, the foundations should be assessed early and designed properly.
Contact U&M Group today for expert foundation project support, including underpinning, piling, structural repairs and basement construction.