Greater London · London and the South East
Roof Leak Investigation in North Harrow
Tracing where water is getting into your roof for North Harrow, from an experienced roof surveyor. Every survey comes with a written report and photos.
- Water dripping from rafters or underlay
- Damp patches next to the stack
- Water coming in around a roof light or dormer
Your questions about roof leak investigations in North Harrow
Is North Harrow in the area you cover?
Yes. We survey roofs across London and South East England, and North Harrow is part of that. Just call 07833 053749 or use the contact form and let us know about the property, and we will talk through which survey suits.
Can parking be tricky for a visit in North Harrow?
Parking in North Harrow, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
What happens next?
We email you the written report with photographs and recommendations. It is yours to share with a seller, insurer, roofer or managing agent, whichever applies.
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, let us know when you book.
Is this an asbestos survey?
No. We do not sample or test for asbestos. Where a material might contain it, like old cement sheets on a building from before 2000, the report flags it, with a recommendation to have a specialist asbestos surveyor check before it is disturbed.
Can you survey a shared roof?
Yes, if whoever owns or manages the building agrees access. On a shared roof we can only inspect the parts we’re allowed to reach, and the report makes that clear.
What does a roof survey cost?
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 inc. VAT.
Roof leak investigation in North Harrow: what you get
Some ‘leaks’ aren’t leaks at all. 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, because they need very different work. We check the pattern of damp, the weather and the ventilation before reaching a view. If you are worried about staining where a gutter or parapet meets the wall and staining around the chimney inside, we can find out what’s behind it.
In converted houses and blocks across London, water from a roof can run a long way before it shows on a ceiling, sometimes in a different flat from the one below the defect. That makes the source hard to pin down, and finding it matters for whoever has to deal with it. We check what we’re given access to in North Harrow, inside and out. Tell us when the water shows, and in what kind of weather.
The report is written in plain words, so you do not need to be a roofer to follow it. Photographs show what each point refers to, with the urgent items made clear.
- Where
- North Harrow (HA2, HA1, HA5)
- Wider area
- Greater London
- Cost
- From £150 inc. VAT
- Your report
- A written report with photos, by email
- Appointments
- Weekdays and weekends
- Cover
- Professional indemnity and public liability
- Telephone
- 07833 053749
- Page updated
- 27 October 2026
What we cannot see
It is a careful look at the leaking roof, not the whole story. The main limits are:
- Structural calculations (that is a structural engineer’s job)
- Leaks from plumbing, tanks or pipework rather than the roof
- The repair itself (the investigation finds and reports the cause)
Not sure which survey suits your roof? You can phone 07833 053749 or drop us an email and we will tell you. What a survey covers and does not.
What we check
- Valleys and parapet gutters
- Rooflights and dormers
- Flat roof details
- Slate and tile slopes
- Chimney stacks
- Lead flashings
- The roof space
Wind, rain and roofs in North Harrow
In outer London, interwar semis with hipped, tiled roofs sit alongside older slate-roofed terraces. On a semi of that age, the small roofs over the bays, the hip tiles and any later dormer each need their own look. Knowing the roof type helps narrow down where water may be getting in. The wider area around North Harrow has a long history of building, with Headstone Manor about 0.8 miles north-east. 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.
If your home is one of the older ones in the streets near Church of St Alban, water on an older roof tends to find its way in at the lead, the valleys or the chimney. If you run a business near St. George's Shopping Centre, water through a ceiling can damage stock and close a sales floor, so the source needs finding fast. Anyone responsible for a site like Longfield 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.
North Harrow is about 1 mile north-west of Harrow, in Greater London. In North Harrow, as across Greater London, every roof gets the same careful survey. North Harrow is one of the towns and villages in Greater London we cover for roof leak investigations. For surveys nearby, see our London page.
Postcode districts we cover here for roof leak investigations: HA2, HA1 and HA5. Whether your property is on The Avenue, Pinner Road and Durham Road or a nearby road, we can help. We also cover the places around North Harrow: Rayners Lane (1 mile south-west), Harrow (1 mile south-east), Roxbourne (1 mile south-west), Eastcote (1 mile west) and Greenhill (1 mile east). We also work in nearby towns such as London (13 miles south-east), City of Westminster (10 miles south-east), Marylebone (10 miles south-east), Kensington (9 miles south-east), St Pancras (11 miles east) and Shoreditch (13 miles east).
Around North Harrow
Around North Harrow, our work takes us to homes and buildings near Nower Hill High School, Heathfield School and Headstone Manor Recreation Ground. The nearest railway station is Harrow-on-the-Hill station, roughly 1.2 miles east of the centre. Nearby you will also find St. George's Shopping Centre (1 mile east) and Hilfield Castle (5 miles north). For a walk, there is Northala Fields and Islip Manor Meadows.
Useful tips for North Harrow property owners
Here are a few things we’d tell any owner:
- Make sure the loft is accessible
- Stay off ladders and the roof
- Do not touch fittings that water is reaching
- Let us know what has already been tried
We email the report to you. It sets out where we believe the water is getting in, how it is travelling and what needs attention. Turnaround is within 48 hours for Basic, 24 to 48 hours for Standard and the same day for Premium.
Have flashings and flat roofs looked at every few years. Flashings, valleys and flat roof details are frequent weak points, and catching wear early keeps water out.
How the survey works
We will ask a few questions first, like when any problem began and what work has been done before. The inspection then takes roughly 1–2 hours for most houses, and about three to four hours for a commercial roof. For a visit in North Harrow, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor the property is on and how to get into the loft. On the day, the roof is looked at from ground level, from windows, from inside the roof space and from the roof where it is safe.
- We start with what you’ve seen: where the stain is and when it gets worse.
- The visit starts indoors, at the stain and in the loft.
- We check the likely entry points outside, such as flashings, valleys, chimneys and gutters.
- Moisture readings and thermal imaging are used where they help.
- Your report sets out where the water is most likely getting in, with photos and recommendations.
Before the survey
- Dig out any old roof reports or invoices
- Clear the way to the loft hatch
- Have any questions written down, so nothing gets missed
Getting a price
When you are ready to go ahead, ring 07833 053749 or email us. We’ll suggest a package, agree the price and find a date, weekday or weekend.
Related advice
More services for North Harrow
How we price roof leak investigations
Prices always include VAT. The things that change the price are:
- Roof area
- Extra roofs, like extensions, dormers or garages
- Building height and the viewpoints available
- Whether thermal imaging or a drone is needed
Simple, low roofs take less time to survey than tall or complicated ones, and the package matters as well. The price is always agreed first.
Getting in touch
A few details help us recommend the right survey and price. When you contact us, let us know:
- The type of building and roof, such as pitched or flat
- The reason for the survey, such as buying, a leak or storm damage
- Dates you’re working to, like exchange
- Any photos you have, taken from ground level or a window
Photos help, if you have them. Take them safely from ground level or a window. To get started, ring 07833 053749 or drop us an email.
Roof by roof
Valleys
Valleys collect water from two roof slopes. Worn or split linings and slipped valley tiles let it under the coverings.
Parapet and box gutters
A butterfly roof drains to a central valley gutter. If that gutter or its outlet fails, water can come through the top-floor ceiling.
Surveys for landlords and agents in North Harrow
Where a roof is shared: access has to be agreed with whoever owns or manages the building. Let us know about it as you book and we will plan the visit with that in mind.
Landlords, agents and building managers in North Harrow and across Greater London can book any of our surveys. For a price for a let property or a block, ring 07833 053749 or email us.