Greater London · England
Window Mastic in Golders Green
Window mastic for Golders Green, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Water coming in at the bottom corners of a door
- A bead that does not match the frame
- Gaps between the frame and the inside reveal
About our window mastic in Golders Green
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on timber windows & doors, aluminium frames and uPVC windows, and common reasons people get in touch are draughty joints inside around the window and whistling draughts around closed windows.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Golders Green (NW11, NW2, NW3)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What window mastic looks like in Golders Green
Historic houses like Heath House (about 1.1 miles south-east) are a reminder that the area around Golders Green has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
As a London address, Golders Green can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Letting a property close to Cricklewood station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Golders Green is about 1 mile north of West Hampstead, in Greater London. For window mastic in and around Golders Green, please ring 0345 464 0079 or email us for a quick quote. We are based in Crawley and cover Greater London, Golders Green included. Our Greater London coverage runs to 764 places, Golders Green among them. There’s also a page for London, about 7 miles away.
We work across NW11, NW2 and NW3 for window mastic and the streets around it. Whether your property is on Nant Road, Hoop Lane and Park Avenue or anywhere close by, we can help. We also cover Temple Fortune (1 mile north), Childs Hill (1 mile south), North End (1 mile south-east), Hampstead Garden Suburb (1 mile north-east) and Vale of Health (1 mile south-east). We also work in nearby towns such as London (7 miles south-east), City of Westminster (5 miles south-east), Marylebone (4 miles south-east), Kensington (5 miles south), St Pancras (5 miles south-east) and Shoreditch (6 miles south-east).
Landmarks near Golders Green
We work in homes and buildings around Childs Hill Park, The King Alfred School and The Old Bull and Bush pub, among other places. Golders Green’s nearest station is Cricklewood station, roughly 1.2 miles south-west. Nearby you will also find Kenwood House (1.3 miles east) and Brent Cross Shopping Centre (1.1 miles west). For a walk, there’s Parliament Hill and Darland's Lake.
What we do, step by step
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from an hour or two to a full day, depending on how many frames there are. In Golders Green, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Mention any sign-in or site rules at work premises
- Plan for the work area to be out of bounds to pets and children
Getting a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved.
Read more
Landlord and commercial work in Golders Green
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
In hotels, rooms out of use cost money, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Penetrating damp from a failed cavity tray or render
- Worn gaskets, brush seals or a door that has dropped
- Condensation trapped between the panes
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
Joints and surfaces we work on
- Composite doors
- Window sills
- Timber windows & doors
- Patio & French doors
- Aluminium frames
- uPVC windows
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
What affects the cost of window mastic
We quote each job individually. These are the things that affect it:
- Whether old sealant or filler has to be cut out
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
- Working hours on commercial sites
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts, so you know where you stand.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- How we’d reach the joints
- Whether it has been sealed before
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
For window mastic in Golders Green, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Nearby places to Golders Green
Other services in Golders Green
Golders Green questions
I let a flat near Cricklewood station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Can parking be tricky for a visit in Golders Green?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you do not need to watch us work.
Can you do several jobs on one visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient.
Do you work in Golders Green?
Yes. We’re based in Crawley and work across South East England, London and Scotland, and that includes Golders Green.
Can you do upstairs windows?
Generally, yes. We plan safe access before the job.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used before we leave.
What the job involves on each surface
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so we pay close attention there.
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. We will point out any rot we find, as that’s a job for a joiner.
What we are called out for in Golders Green
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, and a gap filled solid can’t flex. That is what backing rod is for.
Look out for these signs:
- Draughty joints inside around the window
- White mastic on grey or black frames
- Hard, cracked sealant around windows
- Mastic that’s falling out in pieces
Managing a site like Rimon Jewish Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- What happens if the job turns out different
- Is the old sealant removed completely?
- Who turns up on the day
- How long the guarantee is