Buckinghamshire · London and the South East
Grendon Underwood Roof Leak Investigation
Not sure what state the leaking roof is in? You can book a roof leak investigation in Grendon Underwood and across Buckinghamshire, with plain-English findings.
- Stains around a skylight
- Wet patches on loft insulation
- Damp underlay across a wide area
Roof leak investigation in Grendon Underwood
We use moisture detection and thermal imaging where they help. Moisture readings show which materials are wet. A thermal camera shows patterns of temperature rather than water, so we confirm what it suggests with moisture readings. Moisture detection is included in the Standard Survey, and thermal imaging in Premium. The best thermal results come after a sunny day, with a dry roof and little wind. We survey the roof space, lead flashings and slate and tile slopes, and the problems we are asked to look at most are leaks below a flat extension roof and wet patches on loft insulation.
Many homes in small places like Grendon Underwood face open ground, where storms hit ridges, verges and chimneys hardest. Damp in old stone, brick or timber walls is slow to dry out, which makes finding the cause quickly worthwhile. A written record also helps if you need to explain it to anyone else.
Where we cannot see part of the leaking roof, the report says so. That way, it is clear what was covered and what wasn’t.
- Where
- Grendon Underwood (HP18)
- Wider area
- Buckinghamshire
- Cost
- From £150 inc. VAT
- Your report
- A written report with photos, by email
- Survey days
- Weekdays and weekends
- Insurance
- PI and public liability insurance
- Telephone
- 07833 053749
- Page updated
- 27 October 2026
Questions from Grendon Underwood
Do you cover smaller places like Grendon Underwood?
Yes, Grendon Underwood is covered. Our area covers London and South East England, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How do I find out if my home in Grendon Underwood is listed?
Historic England’s list shows listed buildings, and the local council can tell you about conservation areas. Listed building consent is needed for changes that affect a listed building’s special interest, and conservation areas can limit changes of roofing material.
How much is a survey?
Roof leak investigation starts from £150, including VAT. Our Basic Survey starts from £150, the Standard Survey from £250 and the Premium Survey from £400, all with VAT included.
Can you give me structural calculations?
No. Visible signs like deflection or sagging are recorded, but calculations and an engineer’s opinion are outside what we do. If one is needed, the report says so.
How many surveys have you done?
Over 5,000 surveys so far, across 20+ years of surveying roofs.
Is thermal imaging part of a leak investigation?
We use thermal imaging where it helps, and it’s part of the Premium Survey. It picks up temperature patterns rather than water, so anything it suggests is checked with moisture readings.
I live in a flat. Can you survey the roof?
Yes, if the building owner or managing agent agrees access. We check the parts we are given access to.
Nearby places to Grendon Underwood
Other services in Grendon Underwood
Wind, rain and roofs in Grendon Underwood
Thatch survives on some older buildings in Buckinghamshire’s villages. Across the South East, older homes tend to have slate or clay tiles, and many later ones concrete tiles. Each of these roof types has its own typical places for water to get in. About 3.6 miles north-east lies Claydon House, a reminder of how long the area around Grendon Underwood has been built on. Period homes nearby can have lead valleys, tall chimneys and a patchwork of past repairs, and the council can say whether a home is in a conservation area.
Take a building like Grendon Underwood Combined School: a leak through a large roof is often found some distance from where the water shows inside.
Grendon Underwood is about 6 miles east of Bicester, in Buckinghamshire. Anywhere in Grendon Underwood, we can come and survey your property, on a weekday, Saturday or Sunday. Grendon Underwood is one of the places in Buckinghamshire where we work. For surveys nearby, see our Oxford page.
Roof leak investigations in HP18 work the same way as everywhere else we cover. We offer roof leak investigations to properties on Main Street, The Firs and Darley's Close. Other places close to Grendon Underwood include Edgcott (1 mile north), Ludgershall (2 miles south-west), Piddington (3 miles south-west), Blackthorn (4 miles west) and Brill (5 miles south-west). Further out, we also cover Aylesbury (9 miles south-east), Buckingham (8 miles north), Elmhurst (9 miles south-east), Southcourt (10 miles south-east), Princes Risborough (13 miles south-east) and Haydon Hill (8 miles south-east).
Near you in Grendon Underwood
Open spaces near Grendon Underwood include Upper Ray Meadows.
Useful tips for Grendon Underwood property owners
From years of surveys, a few habits stand out:
- Mention earlier attempts to fix the leak
- Put a bucket under the drip and move valuables
- Move stored items away from the hatch
- Photograph the stain each time it appears
Where we find more than one possible route, we say which is most likely and why. We say which items need prompt attention.
Have leaves and moss cleared from gutters, valleys and outlets, ideally once the leaves have fallen. Many leaks start with a blocked outlet. Leave the clearing to someone with the right equipment.
What you can safely check yourself
A lot can be seen from ground level. Binoculars help you spot slipped slates or tiles, gaps along the ridge and a leaning stack. Never climb onto the roof to look.
Keep a simple record: when leaks happen, ground-level photos and any past roof work. Send it with your enquiry, as it helps us focus the survey.
Why get it checked now?
Wet insulation does not insulate well. Insulation can soak up water quietly before anything shows below. Catching it early limits what has to be replaced. Outbuildings and barns around Grendon Underwood are easy to forget, but a failed roof there can spoil what’s stored inside. A quick look before winter can save a lot.
Larger roofs, taller buildings and commercial roofs take longer, so they’re priced to match. You’ll know the figure before booking.
What you get with us
- Clear package prices, inc. VAT
- A report with photographs
- Satisfaction rate of 98%
- Covered by professional indemnity and public liability insurance
Take a look at how roof surveys are priced or our case studies.
Common roof problems in Grendon Underwood
When a slate slips or a tile cracks, the underlay takes the water. Old bitumen felt may cope for a while, but it tears and sags with age, and very old roofs may have no underlay at all. On slate roofs, slipping is often caused by corroded nails.
Typical things we’re asked to look at include:
- Ceiling stains that grow after rain
- Condensation that looks like a leak
- Damp on a chimney breast
- Damp walls below an overflowing gutter
If your home is one of the older ones in the streets near Church of St Leonard, water on an older roof tends to find its way in at the lead, the valleys or the chimney.
Before you book any roof surveyor
- What experience they bring
- What insurance they carry
- Is there a chance to talk the report through?
- Do they have a CAA Flyer ID and Operator ID for drone work?
The survey, step by step
Where it is relevant and can be reached safely, the loft space is checked as well as the outside. In the loft, the signs we look for are staining, damp, daylight and sagging, as far as the space allows. The whole visit normally takes about one to two hours at most homes, rising to roughly 3–4 hours on a commercial building. Older roofs in small places like Grendon Underwood can have low, tight loft spaces, so it is useful to know whether there is a loft hatch and how easy it is to reach. We only go where it is safe.
- You tell us where the water appears, when, and what the weather was doing.
- We examine the damp area and the rooms near it.
- From the roof space, we trace the water’s route where there’s safe access.
- Outside, we check flashings, valleys, chimneys, gutters and flat roof details from every safe viewpoint.
- You receive a report with the likely source, photos and recommendations.
Before the survey
- Point out any leaks or damp patches
- Keep pets in another room
- Jot down any questions you want answered
Book a survey
Getting a price is simple: just phone 07833 053749 or drop us an email and give us some details about the property and we’ll point you to the right survey. We confirm the price before anything is booked.
Advice
What a roof leak investigation does not cover
Our findings are based on what we can see safely on the day, so there are some things a survey can’t cover:
- A promise to find every leak on a single visit
- Putting the leak right
- Water from pipes, tanks or heating systems
Not sure which survey suits your roof? You can phone 07833 053749 or use the contact form and we will tell you before booking. What our survey covers.
Roof types and parts we check
- The roof space
- Chimney stacks
- Flat roof details
- Rooflights and dormers
- Lead flashings
- Slate and tile slopes
- Valleys and parapet gutters