Greater London · London and the South East
Harrow Roof Leak Investigation
Wondering about the leaking roof at a property in Harrow? You can book a roof leak investigation in Harrow and across Greater London.
- Water that shows only in certain storms
- Damp walls below an overflowing gutter
- Condensation that looks like a leak
How a roof leak investigation works in Harrow
Not every drip is a leak. In a badly ventilated roof space, condensation can form under the roof and drip, leaving marks that look just like rainwater. Telling the two apart matters, since the cure for one won’t solve the other. We check the pattern of damp, the weather and the ventilation before reaching a view. We survey valleys and parapet gutters, lead flashings and slate and tile slopes, and the problems we’re asked to look at most are damp on a chimney breast and drips from nail tips in a cold loft.
In a London flat, water can travel some way before it shows. That makes the source hard to pin down, and finding it matters for whoever has to deal with it. In Harrow, we inspect what we can reach safely and are given access to. It’s useful to know when the water appears and in what weather.
Report times depend on the survey you book: Basic within 48 hours, Standard in 24–48 hours and Premium the same day.
- Location
- Harrow (HA2, HA1, UB5, HA3)
- Wider area
- Greater London
- Price
- From £150 inc. VAT
- Report
- Written, with photos, emailed to you
- When we survey
- Weekdays and weekends
- Cover
- PI and public liability insurance
- Call
- 07833 053749
- Updated
- 27 October 2026
Wind, rain and roofs in Harrow
Alongside Victorian and Edwardian terraces, outer London has a great many interwar semis, often with hipped roofs of clay or concrete tiles. If your home in Harrow is one of them, bay roofs, hips and later dormers each have their own details. Where water gets in depends a good deal on what the roof is made of and how it’s detailed. With Headstone Manor about 1.4 miles north, Harrow sits in an area with a long building history. Older roofs in the wider area can hide decades of patch repairs, so the detail matters, and a listed home or one in a conservation area may need consent for changes of material.
Take an older house close to Church of St Peter: the leak may come from a chimney, a valley or tired lead rather than the covering itself. If you own a rental within reach of Harrow-on-the-Hill station, tracing a leak quickly matters when a tenant is living with it.
Harrow is about 7 miles south of Watford, in Greater London. We carry out roof leak investigations in Harrow for houses, flats, blocks and commercial buildings. Our area takes in places right across Greater London, from the larger towns to small villages. You can also see our page for London.
We work across HA2, HA1, UB5 and HA3 for roof leak investigations and the streets around it. Whether your property is on High Street, London Road and Perceval Square or anywhere close by, we can survey it. Being close to the B457 and B458, Harrow is simple for us to get to for roof leak investigations. We also cover the places around Harrow: Roxeth (1 mile south), South Harrow (1 mile south), North Harrow (1 mile north-west), Harrow on the Hill (1 mile south-east) and Rayners Lane (1 mile west). We also work in nearby towns such as London (12 miles south-east), City of Westminster (9 miles south-east), Marylebone (10 miles south-east), Kensington (8 miles south-east), St Pancras (11 miles east) and Shoreditch (12 miles east).
What’s near Harrow
We work in homes and buildings around Kingsfield Arms, Grange Primary School and Northwick Park and the streets around them. The closest station to Harrow is Harrow-on-the-Hill station, about 0.7 miles north-east. Nearby you will also find St. George's Shopping Centre (0.7 miles north-east) and Clementine Churchill Hospital (1 mile south-east). For a walk, there is Islip Manor Meadows and Northala Fields.
Do you need a roof leak investigation in Harrow?
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.
Problems we come across often include:
- Condensation that looks like a leak
- Water coming in around a roof light or dormer
- Wet patches on loft insulation
- Leaks that appear only in driving rain
Shop and office owners around St. George's Shopping Centre may find that a leak can close part of a shop or office, so finding the cause quickly matters.
What to check before booking
- Whether the loft is part of the inspection
- Whether the price includes VAT
- What experience they bring
- What insurance they carry
Tips from our surveys
Nothing here needs a ladder. A few suggestions:
- Let us know about any past repairs to the roof
- Record whether it leaks in every downpour or only some
- Clear the loft hatch so we can get in
- Put a bucket under the drip and move valuables
With the Standard Survey you get a follow-up consultation, while Premium includes one in person. It is a chance to ask about anything in the report.
Keep the roof space ventilated. Air movement keeps condensation down, and condensation is a common false alarm. Keep insulation clear of the eaves.
For landlords and managing agents
Letting agents can arrange access with tenants, at a time agreed ahead of time. We survey seven days a week, which helps when tenants work during the week.
Surveys can also be booked by buyers’ agents acting for a client. The report is emailed, so it can go straight to your client, photographs included.
Why act early in Harrow
A leak near lights or wiring needs attention quickly. Keep away from any fitting that water is reaching and have an electrician check it. Then the source needs tracing. In a London terrace or conversion, a roof defect rarely stays your problem alone: failed flashings and blocked valley gutters can send water into more than one home. Finding it early keeps the work smaller.
For a price for your roof in Harrow, phone 07833 053749 or drop us an email with the address and some details. We will confirm the figure before booking.
Why book with us
- Drones and thermal imaging where applicable
- Over 20 years’ experience
- Photos and a written report every time
- Professional indemnity and public liability insurance
See what a roof survey costs or what we found on two real jobs.
The survey, step by step
Time on site depends on the size and shape of the roof, but as a rough guide the survey takes between one and two hours for most homes, though a hard-to-trace leak can take longer. You’re welcome to ask questions while we are there. Surveys in Harrow can be booked for any day of the week. London parking is often by permit or pay-and-display, so it is useful to know what’s near you, and to clear a path to the loft hatch. A back bedroom window can be the best vantage point for a rear addition, so we may ask to use one.
- We help you choose the package that suits the leak.
- A visit is booked for a weekday, Saturday or Sunday.
- The investigation works from the stain back to the roof.
- Moisture detection and thermal imaging are used where your package includes them and they help.
- The report explains the likely entry point and what needs attention.
Before we arrive
- Leave a clear route to the loft
- Point out any leaks or damp patches
- Make a note of anything you’d like us to look at
How to book
To book a survey, phone 07833 053749 or email us and tell us the address and what’s prompted the survey. You will know the price before anything is booked.
Advice
Common questions in Harrow
Is Harrow in the area you cover?
Yes, Harrow is one of the places we work. The survey and report are the same in Harrow as anywhere else, and visits run on weekdays and weekends.
How do I find out if my home in Harrow is listed?
For listing, use Historic England’s list; for conservation areas, ask the council. It matters most if you’re planning to re-roof in a different material.
How long have you been surveying roofs?
We have been surveying roofs for over 20 years and have completed over 5,000 surveys.
Do you need to get into the loft?
Where it is relevant to the survey and there’s safe access, yes. Please clear anything stored under the hatch.
Do you carry out surveys on Saturdays and Sundays?
Visits run seven days a week in the daytime, which suits people who work during the week. Let us know your preferred days when booking.
How long will you be at the property?
Allow between one and two hours, more where the leak is intermittent or the roof is large. We’ll confirm what to expect when we arrange the visit.
When does the report arrive?
Report times are set by the package. 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 when you book.
Also in Harrow
How we price roof leak investigations
When we price a survey, we consider:
- Roof area
- The number of roofs, including extensions and garages
- How complicated the roof is, with its valleys, chimneys and parapets
- Building height and the viewpoints available
A small, low roof with good viewpoints takes less time than a tall, complicated one, and the package matters as well. We’ll give you the figure before anything is booked.
Booking your survey
There’s no need for technical words. It’s enough to let us know:
- The reason for the survey, like buying, a leak or storm damage
- Photos of the roof, taken safely from ground level or a window
- Where water is showing inside, if it is
- Access details, such as a loft hatch or a shared roof
Not sure which survey you need? It is easiest to ring 07833 053749 or use the contact form and describe the roof and what’s worrying you. We will explain the options and the price.