Questions we are asked

Subsidence cracks that run diagonally across walls, floors that flex or dip underfoot, doors that stick without an obvious cause, and gaps opening between floor edges and skirting boards can all point to a void developing beneath the structure. Any crack that widens over a few weeks, or a floor that feels less solid than it once did, is worth having looked at before the situation progresses.

Voids grow over time as soil continues to wash away or compress. A small hollow beneath a slab can widen until the slab loses enough support to crack or drop. Foundations can shift unevenly, putting stress on walls and causing secondary cracking throughout the structure. The earlier a void is dealt with, the smaller the repair is likely to be.

The most common approach injects a grout or resin material through small-diameter holes drilled into the floor slab or surrounding ground. The material flows into the hollow space, compresses loose soil, and sets to form a stable mass. The specialist firm assesses the extent of the void first and advises on the right fill material and injection pattern for the ground conditions on site.

Not necessarily. Ground movement has several causes, and not all of them involve a void. The specialist firm visits the site, examines the ground and structure, and advises whether void filling is the right course of action. Some situations call for soil stabilisation or sinkhole remediation instead. An accurate assessment avoids work that is not needed and identifies work that is.

A specialist firm takes on every part of the job: the site visit, the assessment of ground conditions, the selection of fill material, and the injection work itself. The firm's technicians are the people on site. They record what they find, advise on the scope of work, carry out the fill, and confirm the outcome once the material has set.

For a smaller job, the specialist firm can often work out a price from photographs of the affected area. For larger or more complex work, a free site visit and assessment lets the firm measure the void, assess the ground, and produce a written quote. Either way, you receive a quote before any work is agreed. Submit your details and the specialist firm will advise which route applies to your situation.

Yes. Industrial floors, warehouse slabs, retail units, and commercial yards all develop voids, often from water movement under the slab or gradual settlement of fill material placed at construction. The process is the same as for domestic work, though the volume of material and the number of injection points may be greater. When you submit an enquiry, describe the floor type, the building use, and any visible cracking or movement.

Older buildings often sit on shallower foundations and are more exposed to the effects of soil movement beneath them. Voids can form from decayed organic matter, collapsed drains, or long-term water erosion. The specialist firm takes the age and construction type of the building into account when assessing the site. Describing the age of the property and any known drainage issues when you enquire helps the firm prepare for the visit.

Duration depends on the size and depth of the void, the type of fill material used, and how accessible the area is. A single small void under a domestic floor may be resolved in one visit. A larger commercial slab with multiple affected zones takes longer. The specialist firm gives a realistic programme once the site has been assessed. No specific timeframe can be quoted before that assessment takes place.

Void filling uses pressurised injection equipment, specialist grout or resin mixes, and techniques suited to working beneath existing structures without excavating them. A general builder would typically need to excavate, which is more disruptive and may not reach the full extent of a deep or laterally spread void. A specialist firm selects the fill material and injection pressure to match the ground conditions, reducing the risk of further movement after the work is done.