Root Cause Repair Service

Fixing the issues behind damp and mould by finding the cause.

When mould or damp keeps coming back, it is almost always a sign that something in the property is allowing moisture to build, travel or settle. Treating the surface will only offer temporary relief. Long term success comes from repairing the real cause.
Our Root Cause Repair Service identifies and resolves the issues behind damp and mould so your property can stay healthy, safe and comfortable for the long term.

This service is based entirely on evidence. Every recommendation is taken directly from your survey findings, without upselling or unnecessary extras. Whether you are a homeowner, a landlord managing tenant complaints or a housing provider working to improve property standards, the repairs we carry out are specific, targeted and backed by clear diagnostic data.

Mould is not the cause. It is the outcome. Hidden leaks, damaged plaster, failing guttering, cold bridges, blocked ventilation and ineffective extraction systems all contribute to moisture problems that eventually lead to mould growth.

Repairing the visible mould without repairing the cause results in frustration. Residents live with repeating issues and landlords spend money on temporary fixes that never create lasting change. Root cause repairs give you:

A permanent solution rather than a temporary clean

Fewer tenant complaints and call backs, Healthier indoor conditions,

Protection against property deterioration

A clear, evidence based works plan

Confidence that the problem is properly resolved

Leaks

Hidden pipe leaks, waste pipe failures, roof leaks, shower leaks, damaged silicone seals and long term moisture penetration.

Ventilation problems

Faulty or undersized extractor fans, blocked vents, inadequate airflow, poor bathroom or kitchen extraction and inadequate ventilation.

Cold spots and insulation issues

Areas of the building where heat escapes or cold transfers through the structure, increasing condensation and mould risk.

External defects

Damaged guttering, downpipes, pointing, brickwork, render cracks, roofline problems and defects allowing rainwater to enter the property.

Damp plaster and blown surfaces

Plaster that has absorbed moisture becomes weak, salt affected or powdery. This needs removing and reinstating to maintain a healthy surface.

Bridged or compromised DPC

Ground levels, debris or construction changes that allow moisture to rise above the damp proof course.

Ventilation improvements

Installing or upgrading extractor fans, adding trickle vents, improving air paths and correcting poor airflow patterns.

Leak repairs

Fixing internal plumbing leaks, repairing shower and bathroom failures, renewing seals and addressing waste pipe problems.

Guttering and external corrections

Cleaning, repairing or replacing gutters and downpipes, correcting faulty falls, renewing pointing and sealing external gaps.

Internal reinstatement

Removing damaged or salt affected plaster, repairing surfaces and restoring them to a healthy standard.

Insulation improvements and cold spot solutions

Correcting missing insulation, addressing cold bridging and reducing the temperature differences that cause condensation.

Evidence based survey

Your repair plan is created only after an independent survey identifies the causes of damp or mould. This ensures every repair is necessary and accurately targeted.

Clear schedule of works

We provide a written plan showing exactly what needs repairing, why it is required and how it will resolve the issue.

Professional completion of works

Our trained technicians carry out the repairs to a high standard using safe, reliable methods.

Making good

Any areas opened or worked on are reinstated neatly and professionally.

Aftercare and advice

We provide simple guidance on maintaining healthier conditions and reducing future moisture risk.

Optional PRV testing

If required, we can complete air and surface testing to verify the space is safe for reoccupation after the works are complete.

Yes. Repairs should not be carried out without confirming the cause.

Yes. We can arrange access directly to reduce admin for landlords.

Not if the cause has been fully resolved and the environment is balanced.

This depends on the scale of the issue. Most minor works are completed in a day.

What Our Clients Say

Don't just take our word for it - hear from homeowners, housing associations, and property managers we've helped.

"Excellent service from start to finish. The surveyor was thorough and explained everything clearly. The mould treatment has completely resolved our issues and the team were professional throughout."

Sarah Johnson

Homeowner, London

"We've worked with JAG on multiple social housing properties. Their reports are detailed, their pricing is fair, and their work is always to a high standard. Highly recommended."

Mark Thompson

Housing Manager

"Quick response, competitive pricing, and excellent workmanship. The damp issue in my rental property was sorted efficiently with minimal disruption to my tenants."

Emma Williams

Private Landlord, Manchester