Roof Defects and Rainwater Ingress
Roof leaks and defective rainwater systems are a common cause of damp problems in buildings. Water ingress through roof coverings, flashings, valleys, gutters, or downpipes can cause hidden damage to timbers and finishes if left unresolved. We carry out independent roof defect and rainwater ingress surveys in Milton Keynes, identifying the true cause of leaks and providing clear recommendations for repair.
Because roof defects and rainwater ingress often occur at high level or within concealed voids, the signs are not always obvious straight away. Warning signs may include:
Water staining on ceilings or top-floor walls
Damp patches that worsen after rainfall
Dripping or pooling in roof voids
Rotting roof timbers or mould growth in loft spaces
Overflowing or leaking gutters and downpipes
Typical Signs of Roof Defects/Rainwater Ingress
Because roof leaks and rainwater ingress can originate from many different points, identifying the true cause requires careful inspection. Common causes may include:
Broken, slipped, or porous roof tiles and slates
Blocked, undersized, or leaking gutters and downpipes
Defective or poorly installed flashings (lead, felt, proprietary systems)
Failing valley gutters, parapets, or junctions
Missing or defective cavity trays at roof interfaces
Poor detailing on flat roofs and dormers
Common Causes We Diagnose
How We Investigate
Diagnosing roof leaks and rainwater ingress is always a process of elimination. We begin with a non-destructive Stage 1 survey, carrying out a visual inspection inside and outside the building, checking roof coverings, flashings, gutters, and downpipes, and recording moisture readings. A clear written report with photographs is provided before any further investigations are carried out.
Where the source of water ingress is not immediately clear, we may then recommend Stage 2 advanced diagnostics such as tracer dye, controlled water testing, or small opening-up works. These are only undertaken if required and always agreed with you in advance.
Stage 1 - Initial Damp Survey
Step 1 – Understand the Problem
We start by gathering background information:
Gather background on when and how leaks occur (e.g. heavy rain, wind-driven rain).
Review history of past repairs or attempted fixes.
This helps us target our inspection efficiently.
Step 2 – Initial Non-Destructive Inspection
We carry out a detailed internal and external inspection using:
Moisture profiling
Infrared thermography (where conditions allow)
Humidity and temperature checks
Visual assessment of roof coverings, flashings, gutters, and downpipes
This first visit causes no damage — we use only existing access points such as loft hatches, ladders, and safe visual checks from ground level or accessible roof areas.
Step 3 – Report & Recommendations
Following the inspection, we provide a clear written report including:
Photographs of key findings
Diagnosis of the likely cause(s) of water ingress
Practical, proportionate recommendations for repair
This report is issued before any further investigations are carried out, giving you clear guidance and independent evidence to proceed with confidence.
Stage 2 - Optional Further Investigations
If the source of water ingress cannot be confirmed at Stage 1, we may recommend advanced diagnostic tests, such as:
Tracer dye testing to track water paths
Controlled hose or water testing in specific areas
Localised opening-up works to inspect concealed roof details
These investigations are only carried out if necessary and are always agreed with you in advance.
Independent PDF report with photographs
Diagnosis of the source of roof leaks or rainwater ingress
Practical, proportionate recommendations for repair
Confidence to instruct contractors without overspending on unnecessary works
What You Receive
Clear, Transparent Pricing
We believe in complete transparency.
You’ll know exactly what you’re paying for, with no hidden costs and no sales agenda.
Stage 1 – Initial Non-Destructive Survey & Report
From £395 (no VAT)
On-site internal and external inspection
Moisture readings and photographic evidence
Assessment of roof coverings, flashings, gutters, and downpipes
Independent PDF report with findings and recommendations
The Stage 1 report gives you clear next steps — whether that’s instructing targeted repairs or moving on to Stage 2 testing.
Stage 2 – Optional Further Investigations
Where further evidence is required, we can provide:
Tracer dye testing to track water ingress paths
Controlled hose/water testing on suspect areas
Localised opening-up works to inspect concealed roof details
Stage 2 investigations are only recommended if needed and always agreed with you after Stage 1.
You’ll always receive a Stage 1 report first before authorising any Stage 2 works.
Pricing
Why Clients Trust Durndell Damp Surveys
With over 25 years of experience diagnosing damp issues in homes, historic buildings, and complex commercial properties, we bring unrivalled expertise to every survey.
As MRICS Chartered Building Surveyors, we follow RICS standards and always provide independent, evidence-based advice — never driven by sales targets or unnecessary treatments.
Why Choose Us
25 Years of Experience
We’ve spent decades investigating damp and water ingress problems across thousands of buildings — from modern homes to listed heritage properties and specialist environments like hospitals, schools, and laboratories.
This depth of experience means we quickly recognise patterns and causes that less experienced inspectors might miss.
Independent & Impartial Advice
Unlike contractors who offer “free surveys” in order to sell you chemical treatments or tanking, we don’t carry out remedial works.
Our role is purely diagnostic — giving you clear, honest advice on the true cause of the problem.
This protects you from unnecessary costs and ensures you only pay for what’s genuinely needed.
Regulated by RICS (Royal Institution of Chartered Surveyors)
As MRICS Chartered Building Surveyors, we are regulated by RICS, which guarantees that our inspections, reports, and advice meet strict professional and ethical standards.
Our surveys are also backed by professional indemnity and public liability insurance, providing complete peace of mind.
You’re protected by the highest level of professionalism and accountability in the industry.
Clear, Practical Reports You Can Act On
We provide reports that are easy to understand and actionable. Each report includes:
Photographs and moisture maps
A root cause diagnosis, not just symptoms
Prioritised remedial recommendations
Guidance your contractor can implement confidently
Whether you’re a homeowner or managing a large estate, our reports help you fix or manage the problem properly.
Local Knowledge
Based in Milton Keynes, we understand the typical building styles and materials found across the local area, from historic stone cottages to modern housing developments.
Areas We Cover:
We are based in Milton Keynes and typically cover properties within a 30–45 minute drive, including Buckingham, Towcester, Northampton, Bedford, Aylesbury, Leighton Buzzard, and surrounding towns and villages.
If you’re unsure whether we cover your location, please get in touch — we’ll be happy to advise.
FAQs
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We use moisture mapping, thermal imaging, and controlled water testing (if appropriate) to pinpoint the source.
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It usually results from external defects such as cracked render, porous brickwork, defective pointing, damaged roof coverings, or failed seals around windows and doors.
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Yes. We can use drone imaging or telescopic cameras to safely inspect high or complex roof areas.
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A photographic record, diagnostic findings, and clear independent recommendations in line with BS 5250 and Building Regulations.
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No, we provide independent inspection and reporting only. We do not undertake or recommend contractors.
Request a Roof & Rainwater Survey Today
Request a Roof & Rainwater Survey
If you are concerned about roof leaks, ceiling staining, or rainwater ingress, contact us today. Our independent surveys provide clear answers and practical solutions you can trust.
Our independent, RICS-regulated surveys provide a clear diagnosis and practical advice you can trust. With over 25 years of experience, we’ll help you identify the true cause of penetrating damp and guide you through the next steps with confidence.