Greater London · England
Window Mastic in Cricklewood
Window mastic across Cricklewood and nearby, with old sealant always removed completely and a 12-month guarantee.
- White mastic on grey or black frames
- Cracked internal joints between frame and plaster
- Cracked or shrunken mastic around the frame
When to call us in Cricklewood
Sun, frost and rain wear sealant out. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
Signs it’s time to call us include:
- A bead that does not match the frame
- Damp patches on the reveal after heavy rain
- Draughty joints inside around the window
- Old mastic that has gone black or come away
Rented homes near Cricklewood station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What to look for in a quote
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
- Is the old sealant removed completely?
- When the joint can take water or movement
About our window mastic in Cricklewood
Homes in Cricklewood have every kind of window: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Common call-outs are for mastic that’s falling out in pieces and hard, cracked sealant around windows, across uPVC windows, window sills and timber windows & doors.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Cricklewood.
Every job is covered by our 12-month guarantee.
- Place
- Cricklewood (NW2, NW6, NW10)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
Not every sealant suits a window. Interior caulk and bathroom silicone are not made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email.
Why Cricklewood customers choose us
- Colour agreed with you before work begins
- Over 20 years’ experience
- Homes, businesses and hotels
- An ARBOMaster approved applicator
Read what affects the cost and what customers say.
Your questions about window mastic in Cricklewood
I let a flat near Cricklewood station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
Is parking a problem for a job in Cricklewood?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
How do I get a quote for window mastic in Cricklewood?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before we start.
Is the work guaranteed?
Yes, with our 12-month guarantee. A yearly look at the joints helps them last.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Cricklewood.
Can you seal the gap between the frame and the plaster indoors?
Yes. Draughts often come through the inside gap too, so sealing both is often worthwhile.
Do you work on first-floor windows?
Yes, where it’s safe. For high or awkward windows, we will tell you what access is needed.
Windows and doors in Cricklewood
Historic houses like Fenton House (about 1.7 miles east) are a reminder that the area around Cricklewood has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around St Gabriel's Church, the joint between an old wall and a newer frame is normally the first place rain gets in. As a London address, Cricklewood can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Cricklewood is about 1 mile north-west of Kilburn, in Greater London. We carry out window mastic for homes and businesses in Cricklewood, as part of our work across Greater London. Our area takes in 764 places across Greater London. We also work in London, around 7 miles away.
Postcode districts we cover here for window mastic: NW2, NW6 and NW10. You will find streets such as Ivy Road, Walm Lane and Dean Road, all of which we cover. Main roads around Cricklewood include the A407. If you are just outside Cricklewood, we cover Brondesbury (1 mile south-east), Willesden (1 mile south-west), Dollis Hill (1 mile north-west), Willesden Green (1 mile south-west) and Neasden (1 mile west). Within a short drive, we also cover London (7 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (4 miles south), St Pancras (5 miles south-east) and Shoreditch (6 miles east).
Landmarks near Cricklewood
In Cricklewood, that means homes and buildings near Hampstead School, The Crown Public House and Gladstone Park. There’s a railway station in Cricklewood itself: Cricklewood station. A little further out are St Andrew's Hospital (0.8 miles north-west) and Brent Museum and Archives (0.7 miles south-west). For a walk, there’s Parliament Hill and Westbere Copse.
Towns and villages near Cricklewood
More services for Cricklewood
The process
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes anything from an hour or two to a full day, depending on how many frames there are. 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 look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any water getting in
- Keep children and pets away from the work area
Get a quote
We don’t publish a price list. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or send us an email.
Read more
When something else is needed
We will not take on work that won’t last, so these are the limits:
- Broken hinges, locks or handles
- A frame that has rotted at the joint
- A failed sealed unit that has misted up
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
What we seal
- Window sills
- Timber windows & doors
- uPVC windows
- Composite doors
- Aluminium frames
- Patio & French doors
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Paint up to the joint, not over it
- Air rooms to keep condensation down around windows
- Repaint timber before it’s bare
- Look round the frames every year or so
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
What the job involves on each surface
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We look for the cause first.
uPVC windows
The frame is cleaned with a product that will not harm the plastic, then the new bead is laid against the frame and the wall and tooled smooth.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.