Greater London · England
Gutter Sealing in Colindale
Professional gutter sealing in and around Colindale, with old sealant always removed completely.
- End caps that drip every time it rains
- Drips from gutter joints and end caps
- Garage door frames letting rain in
Gutter sealing in Colindale, done properly
We don’t replace gutters, fascias or roofs. What sealant does is close joints; it won’t fix a broken bracket, a cracked section or a blocked downpipe. Common call-outs are for internal damp traced to a gutter joint and end caps that drip every time it rains, across soffit joints, gutter end caps and garage door frames.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
Every job comes with our one-year guarantee, wherever you are in Greater London.
- Location
- Colindale (NW9, NW4, HA8)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Colindale
I let a flat near Hendon station. Can you help?
Yes, we work for landlords and agents. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Is parking a problem for a job in Colindale?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Do you replace gutters or fascias?
We do not replace gutters or fascias. We will tell you if the gutter needs replacing.
How much does gutter sealing cost in Colindale?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before any work starts.
Are you insured?
Yes. We are fully insured.
Do you offer different sealant colours?
Yes. White, clear and grey are common, and other colours are available, and we will agree it with you first.
What gutter sealing looks like in Colindale
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
If you live in an older home near St Matthias the Apostle church, the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Hendon station, a dripping gutter joint or loose fascia trim is easy to miss until damp shows inside.
Colindale is about 1 mile south-east of Burnt Oak, in Greater London. Across the NW9 area, we cover gutter sealing for homes and businesses. 764 places in Greater London are on our list, from the larger towns to small villages. For nearby work, see our London page.
All of NW9, NW4 and HA8 is covered for gutter sealing, from the main roads to the quietest streets. You will find streets such as Cecil Road, Booth Road and Ajax Avenue, all of which we cover. You will find Colindale on the A5150, so it’s easy for us to get to with everything needed for gutter sealing. Close by, we work in West Hendon (1 mile south), The Hyde (1 mile south), The Burroughs (1 mile east), Hendon (1 mile south-east) and Kingsbury (1 mile south-west). Further out, we also cover London (9 miles south-east), City of Westminster (7 miles south-east), Marylebone (7 miles south-east), Kensington (7 miles south), St Pancras (7 miles south-east) and Shoreditch (9 miles south-east).
What’s near Colindale
Locally, jobs take us to homes and businesses close to Sunny Hill Park, Saracens High School and Kisharon College, among other places. For rail, the closest station is Hendon station, roughly 1 mile south-east of the centre. Other landmarks nearby include Edgware Community Hospital (1.3 miles north-west) and Brent Cross Shopping Centre (1.5 miles south-east). Not far away are Darland's Lake and Parliament Hill.
Also near Colindale
Also in Colindale
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
What we do, step by step
You don’t need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the job takes a few hours, depending on the number of joints and the access in most cases. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First, we find the drip and check the gutter is not cracked or sagging.
- We clean out the joint and take out the old sealant.
- The area is dried so the sealant can bond.
- Gutter or exterior sealant is applied and finished.
- We look along the gutter and clear debris around the joints.
Before we arrive
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
- Tell us about any water getting in
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Advice
Quotes for gutter sealing in Colindale
We quote each job individually. These are the things that affect it:
- Mould in or behind the old joints
- The number and length of the joints
- When we can work, for business premises
- How many areas need sealing
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Helping us quote
When you call or email, it’s useful to know:
- Roughly how big the job is
- A few pictures by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details and send photos if you have them.
Keeping the joints in good condition
So the new joints stay in good condition:
- Keep an eye out for wet patches below a joint
- Look along the fascias for open joints
- Rest ladders on the wall, not the gutter
- Keep the gutters clear of debris
Keep the gutters clear of leaves and moss, so water drains away past the joints. Standing water strains every seal.
Once roofline sealant splits, water can get behind it. Resealing early protects the boards.
Why it’s worth doing now in Colindale
New gutters cost far more than a few resealed joints. Where the gutter is in good order and only a joint leaks, resealing is the sensible fix. If it has failed, we will tell you. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Colindale.
Leaving a failed joint normally makes the job bigger, not smaller. If you’re not sure whether it needs doing, call 0345 464 0079 or email us and we will give you an honest view and a quote.
Why choose Mr Mastic in Colindale
- 180+ five-star Google reviews
- 20+ years of sealant experience
- Sealant colour chosen to suit
- Fully insured
Read what affects the cost or our reviews.
When something else is needed
Sealant isn’t the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Problems with the roof covering
- Gutters that have dropped or pulled away
- Guttering that needs replacing
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think before you book.
What we seal
- Soffit joints
- Gutter joints
- uPVC fascias
- Garage door frames
- Roofline trims
- Gutter end caps
When to call us in Colindale
When a gutter sags, its joints open. Sealing won’t hold if the gutter keeps dropping, so the gutter needs refixing first.
Signs it’s time to call us include:
- Rain getting in around a garage door
- Dripping gutter ends
- Streaks down the brickwork from a leaking joint
- Water dripping where gutter sections meet
As a London address, Colindale can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- How much experience the applicator has
- How the colour is chosen
- How the joint is cleaned and prepared
- When the joint can take water or movement