Hertfordshire · London and the South East
Welwyn Roof Leak Investigation
Roof leak investigations across Welwyn, with over 20 years’ experience behind it. You get a clear report with photographs.
- Water coming in around a roof light or dormer
- Damp underlay across a wide area
- Water that shows only in certain storms
Your questions about roof leak investigations in Welwyn
Is my home in Welwyn listed or in a conservation area?
Your council is the best source, with Historic England’s list for listed buildings. Both listing and conservation areas can limit changes of roofing material.
Do you cover Welwyn?
We do. Every survey there gets the same written report with photos, and visits run on weekdays and weekends.
What happens after the survey?
The report comes by email, and you decide the next step: use it with a seller, an insurer, a roofer or a managing agent.
How should I prepare for the leak investigation?
Make sure the loft can be reached. Have any photos of the leak ready, and tell us about past repairs. Keep catching drips and keep water away from electrics.
Can you survey a shared roof?
Yes, as long as access is agreed. The roof of a block or converted house is often shared, so we need permission from the building owner or managing agent. We can only inspect what we are given access to.
Will you walk on the roof?
Only when it’s safe. Safe viewpoints, the roof space and a drone where applicable cover most of what’s needed, and the report notes anything we couldn’t see.
How many surveys have you done?
We have been surveying roofs for over 20 years and have carried out more than 5,000 surveys across London and South East England.
About our roof leak investigation in Welwyn
Older homes have more places for water to get in. Worn lead, tired valley linings and blocked parapet outlets are frequent causes. If your home has a butterfly roof, the central valley gutter is a common culprit. We check parapets, valleys and flashings from each safe vantage point. Our report shows what we found, with photos. Common reasons to book are ceiling stains that grow after rain and leaks below a flat extension roof, across chimney stacks, valleys and parapet gutters and flat roof details.
Older cottages and houses around Welwyn may have roofs with little or no underlay. Without a sound underlay, any gap in the coverings lets water straight through. Whether it’s long-term wear or recent damage makes a difference to what happens next. In the loft, damp battens or wet insulation are often the first clues.
The report works through the roof section by section, from the coverings down to the gutters, each with a short note and a photo. It records what’s sound as well as what is not.
- Where
- Welwyn (AL6)
- Region
- Hertfordshire
- Cost
- From £150 inc. VAT
- Your report
- Emailed report with photos and recommendations
- Appointments
- Weekdays, Saturdays and Sundays
- Insurance
- Professional indemnity and public liability
- Call
- 07833 053749
- Page updated
- 27 October 2026
Nearby places to Welwyn
What else we do in Welwyn
What we do, step by step
Photographs are taken throughout the visit, so you can see in the report what we found and where. We take close-ups from wherever is safe, including by drone where it is applicable and the weather allows. A typical visit takes between one and two hours at a typical home, and about three to four hours for a commercial roof. In a smaller place like Welwyn, parking is seldom the issue; lanes, gates and long drives are worth mentioning. Low roofs on bungalows can frequently be seen well from ground level, and the loft shows the rest, while taller roofs may need other vantage points or the drone where applicable.
- You pick a Basic, Standard or Premium Survey.
- A visit is booked for a weekday, Saturday or Sunday.
- We inspect inside and out, starting from the stain.
- Where it is useful and included, we take moisture readings and use thermal imaging.
- The report explains the likely entry point and what needs attention.
Before the survey
- If you are buying, let the agent know when we’re coming
- Unlock side gates and any roof access doors
- Move anything stored under the loft hatch
Arrange a survey
Booking is simple: just ring 07833 053749 or send us an email, let us know about the property and we’ll explain which survey suits. The price is agreed up front.
Related advice
What affects the price in Welwyn
What a survey costs depends on the time and equipment it needs. The main factors are:
- The use of thermal imaging or a drone
- How tall the building is and how easy the roof is to see
- The type of building, from a house to a block or an office
- Which survey package you book
What a survey costs comes down to the roof itself: its size, its height, how many sections it has and how it can be reached and seen safely. Prices start from £150, including VAT.
Booking your survey
When you call or email, these details help:
- What made you get in touch
- Dates you’re working to, such as exchange
- Pictures of the roof from a safe spot, if you have them
- The style of property, from a terrace to a block
Every survey is priced before it’s booked, so you know the cost up front. Our price is from £150, including VAT. For a price for your roof, call 07833 053749 or email us.
Useful tips for Welwyn property owners
Small things make a difference, both for the survey and for the roof itself. Our tips:
- Keep water away from lights and sockets
- Mention earlier attempts to fix the leak
- Protect furniture and flooring under the leak
- Keep a photo record of the damp patch
With the Standard Survey you get a follow-up consultation, and Premium includes an in-person consultation. It’s a chance to ask about anything in the report.
Have flashings and flat roofs looked at every few years. They’re where most leaks start, and catching wear early keeps water out.
Wind, rain and roofs in Welwyn
Digswell House, about 0.9 miles south-east, is one of the historic houses in the wider area around Welwyn. If your home is one of the older ones, expect a mix of original materials and later repairs on the roof. In this part of the South East, older roofs are mostly slate or clay tile and many newer ones concrete tile. Each of these roof types has its own typical places for water to get in.
Landlords with a home close to Welwyn North station may find that a clear finding on where water gets in helps you brief a roofer right away. If you look after a building such as Monk's Walk School, water through a big roof can travel a long way before it drips, so the search covers more than the obvious spot. Trees in and around Danesbury Park shed leaves that can end up in nearby gutters.
Welwyn is about 2 miles north-west of Welwyn Garden City, in Hertfordshire. Surveys in Welwyn work the same way as everywhere we cover: a careful inspection, photos and a written report. Welwyn is one of the towns and villages in Hertfordshire we cover for roof leak investigations. For surveys nearby, see our London page.
We work across AL6 for roof leak investigations and the streets around it. Streets in the area include High Street, London Road and Mimram Place. We also cover the places around Welwyn: Monkswood (1 mile south-east), Ayot St Peter (1 mile south-west), Ayot Green (1 mile south-west), Pottersheath (2 miles north) and Codicote (2 miles north-west). Within a short drive, we also cover Watford (14 miles south-west), Hemel Hempstead (12 miles south-west), Stevenage (6 miles north), St Albans (7 miles south-west), Harpenden (6 miles west) and Hitchin (9 miles north).
What’s near Welwyn
In Welwyn, that means homes and buildings near Stable Door pub, Danesbury Park and Homerswood Primary and Nursery School and the streets around them. The nearest railway station is Welwyn North station, roughly 1.1 miles south-east. A little further out are Queen Elizabeth II Hospital (3.5 miles south) and Datchworth Museum (2.7 miles north-east). The countryside around Welwyn includes Mardley Heath.
What we look for on each type of roof
Lead flashings
A leak at a flashing frequently shows some way from the joint. We check every flashing that could feed the stain.
Chimney stacks
A stack has several possible ways in for rain. We check each one as far as we can safely see.
What you can safely check yourself
Look up at the roof after a storm, from the ground: pieces of tile or slate on the ground, a gap in the ridge or a lifted flashing are all worth noting. Leave anything above ground level to a survey.
A DIY look is useful, but it isn’t a survey. From the ground, valleys, flashings and the backs of chimneys are often out of sight.
Leave it or get it looked at?
Water damage grows the longer it is left. Wet timbers start to decay, plaster softens and insulation stops working. Tracing it now means less to put right later. Arranging work in a smaller place like Welwyn is easier with notice than in an emergency. Knowing early gives you time to get the right people in.
A small, low roof with good viewpoints takes less time than a tall, complicated one, and the package you pick makes a difference too. We’ll give you the figure before anything is booked.
Why book us in Welwyn
- Surveys seven days a week
- Independent findings on the roof’s condition
- We hold a CAA Flyer ID and Operator ID
- Prices that include VAT
Read what a roof survey costs or our case studies.