Mining Subsidence Reports in Huddersfield

Where the mining question is real, and where it is not

The geology changes across the district. The Colne and Holme valleys and the ground rising towards the Pennines are Millstone Grit - the stone the town is built from - and mining legacy is not the issue there. Move east across the Kirklees district towards the coalfield and it becomes a genuine question.

The way to settle it for a particular property is the mining records held by the Mining Remediation Authority, formerly the Coal Authority. A coal mining report - the search a solicitor obtains on a purchase - tells you what the records show for that address. It is worth reading rather than filing.

One limitation, stated plainly by anyone competent: the records are not complete. Coal was worked in this region for centuries before recording was required, and the oldest workings are both the shallowest and the least well documented. A clean report is reassurance, not proof, which is why what the building itself is doing still matters.

What mining movement looks like, and what it usually is instead

Genuine mining subsidence tends to produce movement across a whole structure rather than at one corner, often with a directional character, and it is normally accompanied by evidence over a wider area than a single house.

In practice, most of the cracking we are called to in Huddersfield is nothing to do with the ground at all. The town's stock produces its own set of defects with far more regularity:

• Roof spread from heavy Yorkshire stone slate roofs pushing the tops of walls outwards over decades
• Failed or cracked stone lintels and heads over openings
• Bowing of rubble-filled stone walls that have lost through-stone restraint
• Historic differential settlement in terraces built stepping down a hillside - which is settlement, not subsidence, and it finished long ago
• Unsupported chimney breast removals
• Leaking drains washing fines out from beneath a foundation, which mimics subsidence closely and is comparatively cheap to fix

The claim route is not the insurance route

This is the practical point that matters most, and it catches people out. Damage caused by coal mining subsidence has its own statutory compensation scheme, administered separately from ordinary buildings insurance.

That means the route, the investigating engineer and the payer are all different depending on the cause. Notifying your insurer for what turns out to be mining damage, or pursuing a mining claim for what turns out to be a failed lintel, both waste months. Establishing the cause properly at the start is what determines which door you knock on.

Where mining is a realistic cause, an engineer's assessment is the evidence needed to open that route.

What an assessment involves

Proportionate, in sequence, with the cheap stages first:

• Inspection and classification of the damage against the BRE Digest 251 categories, with a record of the building's geometry where it is distorted
• A desk study: mining records and abandonment plans, geology, and historic mapping showing what was on the site before the houses were
• Drainage testing, because washout is common and cheap to rule in or out
• Monitoring across a full seasonal cycle, which is what actually distinguishes progressive movement from movement that finished decades ago
• Trial pits to establish what the foundations bear on
• Ground investigation only where the earlier stages justify it

What we do and do not do

We establish the cause and put it in writing. We do not carry out remedial works and we take no commission from anyone who does, which is why 'this is historic and the building is stable' is an answer we give freely - and it is the most common one.

A structural survey and report is a fixed £580 + VAT, with the report inside 10 working days of the inspection, guaranteed. Monitoring, trial pits and ground investigation are scoped and quoted separately, and never recommended without a reason attached.