Greater London · England
Window Mastic in West Hendon
Mastic around window and door frames, sills and patio doors for West Hendon, backed by a 12-month guarantee. Call for a quick quote.
- Gaps left after new windows were fitted
- Damp patches on the reveal after heavy rain
- Gaps between the frame and the inside reveal
Window mastic for homes and businesses in West Hendon
Colour matters on a frame. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. We work on uPVC windows, window sills and patio & French doors, and people most often call us about mastic that’s falling out in pieces and rushed sealant from a window installation.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in West Hendon as anywhere.
There’s a 12-month guarantee on every job, whatever its size.
- Location
- West Hendon (NW9, NW4)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in West Hendon
Is West Hendon in your area for window mastic?
Yes, West Hendon is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and let us know what needs doing, and we’ll send you a clear quote.
Can parking be tricky for a visit in West Hendon?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
What does window mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or send us an email with a short description of the job.
Are you fully insured?
Yes. Mr Mastic is fully insured, and we have been doing sealant work for more than 20 years.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Can you do several jobs on one visit?
Yes, we can. More than one area can be quoted together.
Do you work for letting agents?
Yes. As well as householders, we work for landlords, agents, businesses and hotels.
What do you need from me for a quote?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or drop us an email.
Landlords, agents and businesses in West Hendon
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
What happens if it’s left?
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in West Hendon, the repair is bigger than the sealant job would have been.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why choose Mr Mastic in West Hendon
- An ARBOMaster approved applicator
- Fully insured
- Colour picked to suit the job
- Tidy, careful work
Take a look at our cost guide or our reviews.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What the job involves on each surface
Composite doors
An exposed front door gets wind-driven rain. Those corners get the most care.
Timber windows & doors
Older timber windows in stone or brick can suit sand mastic rather than modern sealant. We’ll tell you which suits your home.
When it is not the sealant
A few problems are outside what sealant work can do:
- A frame that has rotted at the joint
- Worn gaskets, brush seals or a door that has dropped
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think before you book.
What we seal
- Aluminium frames
- Composite doors
- uPVC windows
- Window sills
- Timber windows & doors
- Patio & French doors
Window mastic in West Hendon: local notes
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
If you let a flat or house near Hendon station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. As a London address, West Hendon can be tricky for parking: let us know about parking bays, permits or a driveway. 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.
West Hendon is about 2 miles north of Neasden, in Greater London. Whether you’re in the middle of West Hendon or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and West Hendon is one of them. You can also see our page for London, about 9 miles away.
We work across NW9 and NW4 for window mastic and the streets around it. If you need window mastic at a property on Alpini Road, Catkin Road and Garrick Road or a nearby road, we can help. West Hendon sits on or near the A5. We also cover the places around West Hendon: The Hyde (1 mile south), Colindale (1 mile north), The Burroughs (1 mile north-east), Hendon (1 mile east) and Staples Corner (1 mile south-east). Within a short drive, we also cover London (9 miles south-east), City of Westminster (6 miles south-east), Marylebone (6 miles south-east), Kensington (6 miles south), St Pancras (7 miles south-east) and Shoreditch (8 miles south-east).
Local landmarks in West Hendon
In West Hendon, that means homes and buildings near Woodfield School, Moon Under Water pub and Brampton College. West Hendon has its own railway station: Hendon station. Well-known places in the area include Brent Cross Shopping Centre (1.1 miles east) and Church Farmhouse Museum (1 mile north-east). Not far away are Masons Field and Parliament Hill.
Nearby places to West Hendon
What else we do in West Hendon
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a morning for a couple of windows and a door and we leave things clean and tidy. In a London area like West Hendon, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Mention any leaks or damp you’ve noticed
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
Asking for a quote is easy: let us know what needs doing and where. Photos by email help us understand the job.
Read more
How to look after the new joints
After the cure time, these simple habits help:
- Air rooms to keep condensation down around windows
- Use gentle cleaners on frames and sealant
- Avoid blasting the frames with a pressure washer
- Repaint timber before it’s bare
Most silicone sealants will not take paint, so if you’re planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
A small gap around a frame only grows. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. A new joint closes it up.