A subsidence survey is the moment a worried homeowner stops guessing. You have a crack, or a door that sticks, or a surveyor's report that flagged "possible movement", and you need an impartial expert to walk into your property, look at the evidence, and tell you what is actually happening. That is what an independent subsidence survey from SubsidenceSurveys.co.uk delivers, and the word that matters most in that sentence is independent.
What an independent subsidence survey is
An independent subsidence survey is a focused structural inspection carried out by an accredited surveyor or structural engineer whose only commercial interest is producing an honest diagnosis. We do not carry out repairs. We do not employ underpinning crews. We are not paid more if your property turns out to need a major intervention. That separation is the whole point of the service. Every contractor who offers a "free survey" makes their money on the work that follows, and the report they hand you is shaped, consciously or not, by the size of the job they then hope to quote for.
On site, the surveyor examines the external elevations, the internal walls and ceilings, the floor levels, and the accessible drainage. Crack patterns are sketched, widths measured with a calibrated gauge, photographs taken against a reference, and the property's history is teased out, when the cracks first appeared, what nearby trees look like, whether the drains have ever been investigated, and whether any building work has been carried out in living memory.
Why "independent" is the only word that matters
Subsidence is one of the few structural issues where the most common diagnostic route in the UK is offered for free by the same firm that would charge tens of thousands of pounds to fix it. That conflict of interest is invisible to most homeowners until they have already received the report. An independent subsidence specialist exists as the alternative, paid only for the diagnosis, with no stake in the cost or scope of any subsequent repair.
That impartiality matters most in three situations: when an insurer's loss adjuster has produced a report you do not understand or agree with; when a contractor has recommended underpinning without evidence of active movement; and when you are buying a property whose homebuyer report flagged movement and the seller's previous surveyor has a relationship with a local repair firm.
What you receive
Every subsidence survey we deliver follows the same evidence-led structure: a clear written report, photographs, sketches of crack patterns with widths and directions, a diagnosis, and a recommended next step. That step might be no action at all, a period of crack monitoring, a cause investigation with CCTV drainage and tree-root assessment, or a formal structural engineer's report if the situation warrants one. The report is written in plain English, with the technical detail an insurer or mortgage valuer will expect, and is yours to share with whomever you need to.
When to book a survey, and when to start with photos
Not every crack needs a paid visit. Send photographs through the form on this page first, with a coin or ruler for scale and the cracks photographed from inside and outside where possible. A qualified surveyor will give you a no-obligation opinion on whether a survey is warranted. If the photos show classic cosmetic plaster shrinkage, you'll be told so. If they show anything that needs eyes on, you'll be given a clear quote to investigate properly before anything is booked.
Who we work with
Our network covers the whole of England, Wales and Scotland, with chartered structural engineers and RICS-accredited surveyors who specialise in subsidence diagnosis. We carry professional indemnity insurance, produce reports that are recognised by every major UK buildings insurer and mortgage lender, and have a track record of supporting insurance claims, expert-witness work and pre-purchase decisions.
How a subsidence survey differs from a homebuyer survey
A RICS HomeBuyer (Level 2) or Building Survey (Level 3) is a general-purpose property assessment carried out by a chartered surveyor across all elements of a building, roof, walls, services, joinery, damp, timber, condition. Movement is one section of that report, and will usually be flagged as "evidence of differential movement, further investigation recommended." That sentence is not a diagnosis. A subsidence survey is the specialist response to it. The same evidence , crack patterns, floor levels, tree positions, drainage condition , is examined in microscopic detail by a surveyor whose entire professional focus is the diagnosis of foundation movement. The two documents are complementary, not interchangeable. If a Level 2 has flagged movement, the right next step is almost always a focused subsidence inspection, not another general survey.
The diagnostic toolkit our surveyors bring to site
Subsidence diagnosis is largely a visual discipline, but the visual evidence is sharpened by a small kit of calibrated instruments. Our surveyors arrive with a digital crack-width gauge accurate to 0.1mm, a digital spirit level for checking floor and wall plumb, a moisture meter for cross-checking damp against thermal cracking, a thermal imaging camera for spotting cold-bridging that mimics movement cracking, and a high-resolution camera with a calibrated colour chart. For more complex cases, telltale gauges, demec studs and tiltmeters are deployed as part of a parallel monitoring programme. That toolkit takes the diagnosis from a subjective impression to an evidenced opinion an insurer or court will accept.
What happens after the report lands
Most reports end with one of four outcomes. The first, and most common, is "no further action required". The second is a defined monitoring period, typically across a full summer-winter cycle, to confirm whether the apparent movement is active or seasonally reversible. The third is a recommended investigation: usually a CCTV drainage survey, a tree-root assessment, or in rarer cases trial pits and a soil sample. The fourth, which applies to a small minority of cases, is direct referral to your insurer with the supporting evidence pack, or instruction of a formal structural engineer's report as the basis for an underpinning scheme. We talk every homeowner through the recommendation at no further cost.
Common situations clients book us for
- "I noticed a crack." A worried owner who wants a calm, qualified second opinion before doing anything else.
- "My homebuyer report flagged movement." A buyer who needs an exchange-critical answer in a defined timeframe.
- "My insurer rejected the claim." A policyholder who needs an independent report to support a complaint or ombudsman referral.
- "A contractor told me I need underpinning." An owner who wants a second opinion before committing to a five-figure repair.
- "I'm selling and the buyer's surveyor is worried."A vendor who needs a clean, defendable report to put the buyer's surveyor's concerns to bed.
- "There's a dispute with my neighbour." A party whose case will turn on a CPR-compliant expert witness opinion.