Oxfordshire · London and the South East
Cumnor Roof Leak Investigation
A careful look at the leaking roof at your property in Cumnor, with photographs and a written report.
- Brown rings on upstairs ceilings
- Water that shows only in certain storms
- Stains around a skylight
Roof leak investigations for homes and businesses in Cumnor
Most roof leaks start at a joint rather than the middle of a slope. Common entry points include chimney and wall flashings, valleys, parapet and box gutters, and the upstands and outlets on flat roofs. Each of these is checked in turn and follow the evidence. Chimneys, dormers and roof lights each add joints of their own. Each one is checked from wherever it’s safe to see it. We survey flat roof details, the roof space and valleys and parapet gutters, and the problems we’re asked to look at most are damp walls below an overflowing gutter and damp on a chimney breast.
Somewhere as small as Cumnor, older roofs have often been repaired many times. A new leak may be fresh damage or the latest sign of long-term wear, and the difference matters, particularly to an insurer. We check what can be seen safely and set out what we find. Older walls and timbers hold water for a long time, so it’s worth finding the cause soon.
We write the report in plain English, so it makes sense without any roofing background. Photographs show what each point refers to.
- Where
- Cumnor (OX2)
- Region
- Oxfordshire
- Price
- From £150 inc. VAT
- Report
- Emailed report with photos and recommendations
- Survey days
- Weekdays, Saturdays and Sundays
- Cover
- PI and public liability insurance
- Telephone
- 07833 053749
- Last updated
- 27 October 2026
Tips that help
There is plenty you can do without going near the roof. What helps most:
- Keep a photo record of the damp patch
- Let us know if there are tanks or pipes in the loft
- Tell us about any past repairs to the roof
- Do not touch fittings that water is reaching
Standard includes a follow-up consultation to talk the findings through, and Premium includes an in-person consultation. It is a chance to ask about anything in the report.
Keep the roof space ventilated. Air movement keeps condensation down, which is often mistaken for a leak. Make sure insulation does not block airflow at the eaves.
Also in Cumnor
Should I look at the roof myself first?
Fresh stains on ceilings or walls after rain are worth noting. Take a photo and write down when you saw it.
What you cannot do safely is get up close. Slates, tiles, flat roofs and rooflights can give way, and a fall can be serious. That is where a survey comes in, using safe viewpoints and a drone where it applies.
Landlords, agents and block managers in Cumnor
For a freeholder or residents’ company, a roof report is a sound basis for a maintenance plan, putting the urgent items at the top.
We also survey roofs for businesses and commercial landlords. Bigger roofs take more time, and they’re priced for the size.
Roof by roof
Slate and tile slopes
Ridge and hip tiles can loosen as their mortar cracks. Rain can then run in at the ridge.
Parapet and box gutters
Parapet and box gutters sit behind walls or inside the roof. A blocked outlet sends water over the lining and into the building.
Leaks and storm damage in Cumnor
Older buildings in west Oxfordshire often have Cotswold stone slate roofs, and some Oxfordshire villages still have thatch. Across the South East, older homes tend to have slate or clay tiles, and many later ones concrete tiles. Where water gets in depends a good deal on what the roof is made of and how it is detailed. Historic houses such as Appleton Manor, about 1.9 miles south-west, show how far back building in the area around Cumnor goes. Older roofs in the wider area can hide decades of patch repairs, so the detail matters.
If you live in an older home near Church of St Michael, lead flashings, valleys and old chimneys are typical places for water to get in. Landlords with a home close to Oxford station may find that finding the cause of a leak fast keeps a tenant’s home dry and the work focused.
Cumnor is about 4 miles north-west of Abingdon-on-Thames, in Oxfordshire. We cover Cumnor and the rest of Oxfordshire. Cumnor is one of the places in Oxfordshire where we work.
Here we cover the OX2 postcode area for roof leak investigations. If you need a roof leak investigation at a property on High Street, The Park and The Winnyards or a nearby road, we can survey it. Close by, we survey roofs in Chawley (1 mile north-east), Filchampstead (1 mile north-west), Henwood (1 mile south-east), Dean Court (2 miles north-east) and Botley (2 miles north-east). Further out, we also cover Oxford (5 miles east), Didcot (9 miles south-east), Bicester (14 miles north-east), Abingdon-on-Thames (4 miles south-east), Witney (8 miles north-west) and Carterton (11 miles west).
Around Cumnor
Around Cumnor, our work takes us to homes and buildings near The Vine Inn and Matthew Arnold School, among other places. The nearest railway station is Oxford station, roughly 3.1 miles north-east. Other landmarks nearby include Westgate Shopping Centre (3.3 miles north-east) and Radcliffe Infirmary (3.6 miles north-east). For a walk, there’s Lashford Lane Fen and Cumnor Hill.
Common roof problems in Cumnor
Many leaks begin at a flashing. Lead or mortar closes the gap wherever a roof meets a wall, chimney or dormer. Once that seal cracks or lifts, water gets behind it.
Signs worth acting on include:
- Water through the ceiling under a flat roof
- Ceiling stains that grow after rain
- Wet patches on loft insulation
- Damp on a chimney breast
Shop and office owners around Westgate Shopping Centre may find that water through a ceiling can damage stock and close a sales floor, so the source needs finding fast.
Questions to ask before you book
- Which limits apply to the survey
- Whether VAT is added on top
- What follow-up you get after the report
- Are they insured for the work?
The survey, step by step
The visit typically starts outside and finishes in the loft: outside views come first, then the loft space if there is safe access. All told, expect an hour or two at a typical home, with bigger or more complicated roofs taking longer. For a village or hamlet like Cumnor, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. On the day, we inspect everything that’s safely in view, inside and out.
- You let us know where the water shows and when it appears.
- The visit starts indoors, at the stain and in the loft.
- Likely entry points outside are checked, from flashings and valleys to gutters and outlets.
- We use moisture detection, and thermal imaging where it is useful.
- Your report sets out where the water is most likely getting in, with photos and recommendations.
Before we arrive
- Tell us about parking before the day
- Note where any stains or damp appear
- Make a note of anything you’d like us to look at
Book a survey
Photos help, if you have them. Pictures from the ground or a window are fine; never climb up to get a better view. To send them or to book, ring 07833 053749 or use the contact form.
Advice
Cumnor: your questions answered
Do you carry out roof surveys in Cumnor?
We do. Every survey there gets the same written report with photographs, and visits run on weekdays and weekends.
Will you come out to Cumnor?
Yes, Cumnor is covered. We survey roofs across London and South East England, from towns to the smallest villages. The journey is planned ahead, so it helps to know about access.
Will you fly a drone over my roof?
Where it helps and the rules allow, yes. Our sub-250g drone is flown by a CAA-registered operator with a Flyer ID and Operator ID, and every flight depends on the airspace and the weather.
Do you test for asbestos?
No. Our report may flag materials that could contain asbestos, but only a specialist asbestos surveyor can confirm it. It may be present in buildings built or refurbished before 2000.
Can every leak be traced?
We can’t promise it. Water can travel a long way, and some leaks only show in particular storms. Where the source isn’t certain, we list the likely routes in order.
Is it a structural engineer’s report?
No. We’re roof surveyors, not structural engineers. We will recommend an engineer if we see signs that call for one.
Is the repair included in the leak investigation?
A leak investigation finds and reports the likely source. The repair itself is a separate job. You get a report with photos showing where the water is getting in and what needs attention.