Greater London · London and the South East
Fortis Green Roof Leak Investigation
We take a careful look at the leaking roof at your property in Fortis Green, with photographs and a written report.
- Water coming in around a roof light or dormer
- Drips in the loft during heavy rain
- Staining around the chimney inside
Useful tips for Fortis Green property owners
Getting the most from a roof leak investigation starts before we arrive and carries on afterwards. Tips:
- Record whether it leaks in every downpour or only some
- Catch drips in a bucket and protect the floor
- Photograph the stain each time it appears
- Check whether pipes or tanks run near the stain
Standard includes a follow-up consultation to talk the findings through, while Premium includes one in person. It’s a chance to ask about anything in the report.
Keep gutters, valleys and outlets clear, ideally once the leaves have fallen. Blocked outlets on parapet and flat roofs cause many leaks. Leave the clearing to someone with the right equipment.
Roof leak investigations for homes and businesses in Fortis Green
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 in heavy rain. We check parapets, valleys and flashings from each safe vantage point. The findings are recorded with photos. We survey chimney stacks, lead flashings and slate and tile slopes, and the problems we’re asked to look at most are ceiling stains that grow after rain and damp underlay across a wide area.
London’s Victorian and Edwardian roofs have frequently been repaired many times. Telling wear from a one-off event matters, because insurers usually exclude wear and tear. A careful look in Fortis Green tells the two apart where the evidence allows. A written record with photographs helps you explain what was found to whoever deals with it next.
If any part of the leaking roof couldn’t be seen safely, we say so in the report. That way, it’s clear what was covered and what wasn’t.
- Location
- Fortis Green (N10, N2, N6)
- Region
- Greater London
- Prices
- From £150 inc. VAT
- Report
- Emailed report with photos and recommendations
- Appointments
- Monday to Sunday, daytime
- Insurance
- PI and public liability insurance
- Phone
- 07833 053749
- Page updated
- 27 October 2026
Also near Fortis Green
More services for Fortis Green
How we price roof leak investigations
Prices always include VAT. What changes the price is:
- Whether thermal imaging or a drone is needed
- House, block, shop or office
- Whether you choose the Basic, Standard or Premium Survey
- The number of roofs, including extensions and garages
What a survey costs comes down to the roof itself: how big it is, how high it is, the number of separate roofs and how it can be reached and seen safely. Prices start from £150, including VAT.
Getting in touch
You don’t need to know any roofing terms. Just tell us:
- What made you get in touch
- What kind of property and roof it is
- Photos of the roof, taken safely from ground level or a window
- Your timetable, such as an exchange date
Prices start from £150, including VAT. The exact figure depends on the roof and the package, and you can ring 07833 053749 or use the contact form to find out.
Can I check my roof myself?
During heavy rain, look at the gutters from ground level or a window. Water spilling over the edge can be a sign of a blockage or a gutter that has dropped.
A DIY look is useful, but it isn’t a survey. You won’t see flashings, valleys or the backs of chimneys properly from ground level, and those are details a survey looks at closely.
What a roof leak investigation doesn’t cover
Our findings are based on what we can see safely on the day, so there are some things a survey cannot cover:
- What’s under the covering or behind the plaster
- Whether rotten timbers meet design loads
- A promise to find every leak on a single visit
If you’re not sure which survey you need, ring 07833 053749 or email us and we will give you a straight answer before booking. What a survey covers and doesn’t.
Roof types and parts we check
- Slate and tile slopes
- Chimney stacks
- Flat roof details
- Valleys and parapet gutters
- Lead flashings
- Rooflights and dormers
- The roof space
How the survey works
The visit has one job: to see as much of the leaking roof as can be seen safely and record it clearly. Everything we note and photograph goes into the written report. The visit usually takes about 1–2 hours for most homes, though a hard-to-trace leak can take longer. In a London area like Fortis Green, the main things to sort out are parking and access: let us know about parking, the floor the property is on, any shared entrance and loft access. On the day, the roof is looked at from ground level, from windows, from inside the roof space and from the roof where it’s safe.
- You let us know where the water appears, when, and what the weather was doing.
- Inside, we check the stain and the ceiling around it.
- From the roof space, we trace the water’s route where there is safe access.
- 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.
Getting ready for the survey
- Have keys ready for side gates, garages or roof access doors
- If you’re buying, check with the agent that we can get in
- Dig out any old roof reports or invoices
How to book
We survey roofs on weekdays and at weekends. To arrange a day that suits you, ring 07833 053749 or send us an email.
Related advice
Roof leak investigations in Fortis Green: local notes
Historic houses like Heath Hall, about 1.4 miles south-west, show how far back building in the area around Fortis Green goes. Period homes nearby can have lead valleys, tall chimneys and a patchwork of past repairs. In outer London, interwar semis with hipped, tiled roofs sit alongside older slate-roofed terraces. If your home in Fortis Green is one of them, bay roofs, hips and later dormers each have their own details. Each of these roof types has its own typical places for water to get in.
Take a building like Fortismere School: tracing a leak on a big roof starts with where the water appears and works back. If you live near a park such as Cherry Tree Wood, or anywhere with mature trees, autumn leaves can block gutters and valleys, so outlets and downpipes are worth watching. If you live in an older home near United Reformed Church, old mortar, worn lead and slipped slates are the usual suspects when water gets in.
Fortis Green is about 1 mile south-east of Finchley, in Greater London. Wherever you are in Fortis Green, we can come and survey your property, on a weekday, Saturday or Sunday. We cover towns and villages across Greater London, from the larger towns to small villages. There’s also a page for London.
We cover every part of N10, N2 and N6 for roof leak investigations and the streets around it. We offer roof leak investigations to properties on Hill Road, Durham Road and Steeds Road. Fortis Green is on the A504, so it is easy for us to get to. Neighbouring places we cover for roof leak investigations include Muswell Hill (1 mile east), East Finchley (1 mile west), Highgate (1 mile south), Crouch End (1 mile south-east) and Hampstead Garden Suburb (2 miles south-west). Larger places within reach include London (7 miles south), City of Westminster (5 miles south), Marylebone (5 miles south), Kensington (7 miles south), St Pancras (5 miles south) and Shoreditch (6 miles south-east).
Near you in Fortis Green
We work in homes and buildings around Tollington School, Cherry Tree Wood and The Clissold Arms, among other places. Fortis Green’s nearest station is Alexandra Palace station, roughly 1.4 miles east of the centre. A little further out are Kenwood House (1.6 miles south-west) and Grand Arcade (1.8 miles north-west). Not far away are Highgate Hill and Glebelands Local Nature Reserve.
Your questions about roof leak investigations in Fortis Green
Does a conservation area affect roof work in Fortis Green?
Start with Historic England’s list for listing and your council for conservation areas. It is worth checking before planning roof work, as both can affect what’s allowed.
Is parking a problem for a survey in Fortis Green?
Parking in Fortis Green, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Does someone need to be in?
Not necessarily. If we only need the outside, we can agree that in advance, but anything inside needs someone there to give access.
Will you photograph what you find?
Yes. The report includes photos of what we found, so you can see exactly what each finding refers to.
What does the report include?
It explains what we saw, what it means and what we’d suggest, backed by photographs. It also says if any part of the roof couldn’t be seen safely.
Can you trace a leak in dry weather?
In most cases, yes. Damp materials can be found without rain. For leaks that only happen in certain storms, we report the most likely routes.
Can thermal imaging help find my roof leak?
It can, when the conditions are right. It works best after a sunny day, with a dry roof surface and little wind. Wet insulation holds heat longer than dry, which can show up on the image. We always check what it shows with moisture readings.
For landlords and managing agents
We also survey roofs for businesses and commercial landlords, from shops and offices to industrial units. Larger roofs take longer, so they’re priced to suit.
Landlords, agents and building managers in Fortis Green and across Greater London can book any of our surveys. For a price for a let property or a block, call 07833 053749 or use the contact form.