Greater London · England
Window & door mastic in Colindale, Greater London
Window mastic for Colindale, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Hard, cracked sealant around windows
- Cold air getting in at the frame edge
- A bead that does not match the frame
Window mastic in Colindale
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty. Where the air is getting in through the window itself, we will say so. If you have hard, cracked sealant around windows and whistling draughts around closed windows, we can help, on uPVC windows, window sills and timber windows & doors alike.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
All our work is covered by our one-year guarantee, wherever you are in Greater London.
- Place
- Colindale (NW9, NW4, HA8)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How the job changes by surface
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. Each is cleaned, backed where deep and resealed.
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it, where a rigid one would crack.
Why it’s worth doing now in Colindale
Running fresh sealant over the old joint is tempting, but new sealant cannot bond to old, crumbling mastic. It soon lifts and the leak carries on behind it. The old mastic has to come out. 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.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
What you get with us
- ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
- Fully insured
- Anti-fungal silicone where joints get wet
Take a look at what affects the cost or our reviews.
When to call us in Colindale
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
Look out for these signs:
- Cracked or shrunken mastic around the frame
- Cracked internal joints between frame and plaster
- Gaps where the sill meets the wall
- White mastic on grey or black frames
If you let a flat or house near Hendon station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Questions to ask before you book
- Who turns up on the day
- Is VAT in the price?
- What happens if the job turns out different
- Whether all the old sealant comes out first
Nearby places to Colindale
What else we do in Colindale
What happens on the day
On the day, we look over the joints with you first. We protect the surfaces around the joints before any work starts. Most jobs take most of a day for a typical house, less for a few frames. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Colindale. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
Getting a quote
For a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Advice
Landlord and commercial work in Colindale
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
For anyone letting property in or around Colindale, jobs at different addresses can be quoted together. Send us the addresses and the work at each.
Should I try it myself first?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- Whether there’s mould to deal with
- Whether the work is at height
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
What to tell us for a quote
What to tell us when you ask for a quote:
- The rough size of the job
- Pictures of the joints, sent by email
- How we’d reach the joints
- The problem you’ve noticed
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. When it suits you, ring 0345 464 0079 or drop us an email.
Windows and doors in Colindale
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. Historic houses like Heath Hall (about 3.5 miles east) are a reminder that the area around Colindale has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near St Matthias the Apostle church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Colindale is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Colindale is about 1 mile south-east of Burnt Oak, in Greater London. Colindale gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Colindale is one of 764 places in Greater London where we work for window mastic. There’s also a page for London, about 9 miles away.
Every address in NW9, NW4 and HA8 is covered for window mastic, from the main roads to the quietest streets. Local streets include Cecil Road, Booth Road and Ajax Avenue, all of which we cover. With the A5150 close by, Colindale is easy for our applicators to reach for window mastic. Other places close to Colindale include 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). We also work in nearby towns such as 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).
Local landmarks in Colindale
We work in homes and buildings around Sunny Hill Park, Saracens High School and Kisharon College, among other places. The closest station to Colindale is Hendon station, about 1 mile south-east. Nearby you will also find Edgware Community Hospital (1.3 miles north-west) and Brent Cross Shopping Centre (1.5 miles south-east). Open spaces near Colindale include Darland's Lake and Parliament Hill.
Colindale: your questions answered
Can you help a landlord with a rental near Hendon station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or email us with the details for a clear quote.
Can parking be tricky for a visit 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.
Can I paint over the new sealant?
Most silicone cannot be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint before we leave.
Will the old sealant be removed?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Will resealing my frames help with draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.