We provide engineer-designed underpinning and subsidence repairs in Crosby, L23, in Sefton. Much of the housing here is Victorian, Edwardian and inter-war, and the ground near the shore is sandy, so leaking drains washing out fine soil are a typical concern alongside the usual trees, bays and extensions. A structural engineer establishes the cause first; underpinning is only used when it is genuinely needed.
Does coastal ground change what goes wrong?
Parts of the Sefton coast are covered by blown sand and dune sand, according to the British Geological Survey’s mapping of the Liverpool district. Sandy ground is not a problem in itself; plenty of houses have stood on it comfortably for a century. The difference is in how it fails. Rather than shrinking in a dry summer like clay, fine sand can be carried away by water escaping from a cracked drain, leaving a void under part of a footing. The cracks that follow can appear quite suddenly.
That is why, on a Crosby visit, we pay close attention to where the drains run, the condition of inspection chambers and any damp patches near the walls. Our page on drain-related subsidence covers how a CCTV survey fits in. We never assume the soil under a particular street; that is what investigation is for.
Period houses and their quirks
Larger Victorian and Edwardian homes often have deep main walls, cellars, tall bays and later rear additions, all with different foundation depths. A crack where these meet may be old and stable, or it may be active. Inter-war semis nearer the main roads bring their own patterns: bay windows, side extensions and mature gardens. The questions are the same in each case: is it moving, why, and does the foundation need to change?
From first call to finished repair
- The call: where the cracks are, how wide, whether they have grown, the age of the house, nearby trees and drains, and whether an insurer or buyer is involved.
- The visit: a look inside and out, with photos and notes for the engineer.
- Investigation if needed: drain CCTV, trial pits and soil and site investigation, or a period of monitoring.
- The design: the engineer chooses the repair; we explain it and give a written quote.
- Permissions: Building Control notice and, for semis and terraces, the party wall position.
- The work: carried out in planned stages, then signed off by the engineer and Building Control as applicable.
Methods that may suit
If firm ground lies well below loose sand, the engineer may prefer mini-piled underpinning, taking the load down past the disturbed layer. Where firm ground is reachable, traditional mass concrete bays may be enough. Sometimes no foundation work is needed: once the drain is repaired and the ground settles, the cracks can simply be repaired.
Never fill or paint over a moving crack to hide it, and never start tree work or building work to “stop” movement without the engineer’s advice.
Crosby sits between Formby to the north and the Liverpool suburbs to the south, and we cover Maghull inland too. For background on methods and causes, see our home page on structural underpinning on Merseyside or read up on subsidence and foundation repairs in Liverpool.
Cracks in your Crosby home?
Phone 07777 659786 with a quick description of what you have seen and when it started. We will ring back, ask a few questions about the house and its drains, and arrange to come and look.
Frequently asked questions
Does sandy ground near the coast cause subsidence?
Sand does not shrink and swell with the seasons the way clay can, but fine sand can be washed away by a leaking drain or water main, leaving the footing with less support. That is why drains are often the first thing checked on coastal properties. Whether it applies to your house can only be confirmed by investigation.
Is there a risk to a cellar in a large Victorian house in Crosby?
Cellars mean the main walls go deeper, which can help, but cellar walls can still crack, bow or let water in, and the bay or rear wing may sit on shallower footings than the cellared part. An engineer would look at both. See our page on cellar and basement underpinning for the options where deeper work is needed.
How will you know what the soil is like under my house?
We don’t guess. Where the engineer needs to know, a trial pit beside the footing shows its depth and the ground it sits on, and samples or boreholes can be tested. That information decides whether a repair is needed and which method suits.
Should I tell my insurer before you visit?
If you suspect subsidence and have buildings insurance, yes. The insurer and its loss adjuster decide on investigation, monitoring and repair, and whether underpinning is needed at all. We can explain the process and carry out an agreed scheme, but the decision is theirs.
Can resin injection be used on sandy ground?
It can suit some ground conditions, but not all soils or all causes. The engineer decides based on the investigation results. Read more on our resin injection underpinning page.