Oxfordshire · London and the South East
Harwell Roof Leak Investigation
Roof leak investigations for homes and businesses in Harwell. We’ve completed more than 5,000 surveys across London and the South East.
- Brown rings on upstairs ceilings
- Damp patches next to the stack
- Damp underlay across a wide area
Leaks and storm damage in Harwell
England has around 10,000 conservation areas and about 500,000 listed buildings. If your home is listed, changes that affect its special interest need listed building consent, and in a conservation area re-roofing in different materials may need permission, so the council is the place to ask. West Oxfordshire’s older buildings often carry Cotswold stone slates, and a few villages in the county keep their thatch. In this part of the South East, older roofs are mostly slate or clay tile and many newer ones concrete tile. Where water gets in depends a good deal on what the roof is made of and how it’s detailed.
Anyone responsible for a site like Harwell Primary School will know that water through a big roof can travel a long way before it drips, so the search covers more than the obvious spot. Take an older house close to Church of St Matthew: water on an older roof tends to find its way in at the lead, the valleys or the chimney.
Harwell is about 2 miles west of Didcot, in Oxfordshire. Bookings from Harwell are handled just like any other: get in touch, agree the price and pick a day. Our area takes in places right across Oxfordshire. There’s also a page for Oxford.
We survey roofs across OX11 for roof leak investigations and the streets around it. That includes homes and businesses on High Street, Loder Road and The Styles and the roads around them. We also cover the places around Harwell: West Hagbourne (2 miles south-east), Coscote (2 miles east), Upton (2 miles south-east), Chilton (2 miles south) and East Hagbourne (2 miles east). Within a short drive, we also cover Oxford (11 miles north), Abingdon-on-Thames (5 miles north), Witney (15 miles north-west), Wantage (6 miles west), Grove (6 miles west) and Faringdon (13 miles west).
Around Harwell
In Harwell, that means homes and buildings near The Crispin pub, UTC Oxfordshire and UTC Oxfordshire, among other places. For rail, the closest station is Didcot Parkway station, about 2.3 miles east of the centre. A little further out are Atlas Computer Laboratory (2 miles south-west) and Abingdon Community Hospital (4.8 miles north). Open spaces near Harwell include Churn Hill and Mowbray Fields.
About our roof leak investigation in Harwell
Leaks tend to begin where one part of a roof meets another. Flashings at chimneys and walls, valleys, gutters, parapets and flat roof upstands and outlets are the usual suspects. Each of these is checked in turn and we follow where the evidence leads. Chimneys, dormers and roof lights each add joints of their own. We check all of them, from every safe viewpoint. If you’re worried about drips in the loft during heavy rain and a leak that comes and goes with the weather, a survey will tell you what’s going on, whatever the roof.
Older cottages and houses around Harwell may have roofs with little or no underlay. Without a sound underlay, any gap in the coverings lets water straight through. Finding where it gets in, and whether it is old wear or new damage, decides what comes next. Wet battens and insulation in the loft are often the first clue.
We write the report in plain English, so it makes sense without any roofing background. Each point is backed by a photo where possible.
- Where
- Harwell (OX11)
- Region
- Oxfordshire
- Prices
- From £150 inc. VAT
- Reports
- A written report with photos, by email
- Survey days
- Weekdays and weekends
- Insured
- Professional indemnity and public liability
- Phone
- 07833 053749
- Page updated
- 27 October 2026
Nearby places to Harwell
Also in Harwell
Your questions about roof leak investigations in Harwell
Does a conservation area affect roof work in Harwell?
We cannot confirm that for you, but Historic England’s list and your council can. A change of roofing material may need consent in either case.
Do you cover smaller places like Harwell?
Yes, Harwell is on our map. A small place gets exactly the same survey as a big one, with the route planned beforehand.
Why does not the damp patch line up with the hole?
Water follows the easiest path, not the shortest. On a pitched roof it often runs down a rafter before it shows. Following that route is what our investigation does.
How quickly is the report sent?
Each package has its own report time. Basic: within 48 hours. Standard: 24 to 48 hours. Premium: the same day. If you have a deadline, such as an exchange date, tell us as you book.
Are you structural engineers?
No. We point out what can be seen, like sagging or deflection, but we’re not structural engineers and don’t carry out calculations. If we think you need an engineer, the report says so.
How long will you be at the property?
Allow roughly 1–2 hours for most houses, and about three to four hours for a commercial roof. We’ll confirm what to expect when we arrange the visit.
Could my leak actually be condensation?
The two can look alike. Drips from nail tips, damp underlay over a wide area and poor loft ventilation point towards condensation. We check the pattern of damp and the ventilation, then say which is most likely.
For landlords and managing agents
If you own several properties, surveys can be booked for more than one address. To arrange surveys for several addresses, ring 07833 053749 or use the contact form with the addresses.
Any of our surveys can be booked by landlords, agents and building managers in Harwell. To discuss a property or a block, ring 07833 053749 or send us an email.
How the survey changes by roof type
Flat roof upstands and outlets
Flat roof water can travel under the covering before it shows. Moisture readings and thermal imaging can help narrow it down where conditions suit.
Valleys
A valley takes the rain from both sides of the roof. Split lead, cracked linings or slipped tiles let water in.
When you need someone else
This isn’t a RICS building survey, a structural engineer’s report or an asbestos survey. It also has these limits:
- Defects hidden under coverings or inside walls without opening up
- Whether rotten timbers meet design loads
- Carrying out the fix
Not sure which survey suits your roof? You can phone 07833 053749 or send us an email and we will tell you. What a survey covers and doesn’t.
What we look at
- The roof space
- Chimney stacks
- Slate and tile slopes
- Valleys and parapet gutters
- Flat roof details
- Lead flashings
- Rooflights and dormers
The survey, step by step
We work from the outside in: first the slopes, edges and gutters from every safe viewpoint, then the roof space where it can be reached. All told, expect about 1–2 hours at a typical home, and longer for a large or complex roof. Some parts of a survey depend on the weather, so a visit to Harwell is booked with the forecast in mind: drone flights and thermal imaging need the right conditions, while a look from the ground and the loft can go ahead in most weather.
- We start with your notes and photos of the leak.
- Inside, we check the stain and the ceiling around it.
- In the loft, we follow any signs of water back towards the roof.
- We inspect the likely entry points outside, from the ground, windows and the roof where safe.
- You receive a report with the likely source, photos and recommendations.
Before we arrive
- Let us know where we can park nearby
- Have any questions written down, so nothing gets missed
- Dig out any old roof reports or invoices
Getting a price
To get a price for roof leak investigations in Harwell, ring 07833 053749 or send us an email. A few details about the property and the roof help us give you an accurate price.
Related advice
Common roof problems in Harwell
Flashings are one of the commonest sources of roof leaks. 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, often well away from where it shows.
A survey can pick up problems like:
- Damp patches next to the stack
- Water dripping from rafters or underlay
- Damp underlay across a wide area
- Ceiling stains that grow after rain
If you own a rental within reach of Didcot Parkway station, finding the cause of a leak fast keeps a tenant’s home dry and the work focused.
Questions to ask before booking
- Their insurance cover
- What experience they bring
- Whether the loft space is looked at, where there is one
- If they fly a drone, whether they hold a CAA Flyer ID and Operator ID
Checking the roof from ground level
During heavy rain, look at the gutters from ground level or a window. Water spilling over the edge can point to a blockage or a sagging run.
Fresh stains on ceilings or walls after rain are worth noting. Photograph them and note the date, as it helps a surveyor trace the cause.