Greater London · England
Haverstock Window Mastic
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Haverstock. Fully insured, ARBOMaster approved and guaranteed for a year.
- Untidy mastic left by window fitters
- Mastic that is falling out in pieces
- Cold air getting in at the frame edge
Signs you need window mastic in Haverstock
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Most people get in touch when they notice one of these:
- Rain getting in at the frame or under the sill
- Mastic that’s falling out in pieces
- Hard, cracked sealant around windows
- A bead that does not match the frame
Letting a property close to South Hampstead station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Questions to ask before you book
- How the colour is chosen
- How the surfaces are prepared before sealing
- Whether they seal over old material or remove it
- The length of the guarantee
About our window mastic in Haverstock
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. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. Common call-outs are for cold air getting in at the frame edge and black, perished sealant on frames, across uPVC windows, timber windows & doors and aluminium frames.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, letting in draughts and water.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- Haverstock (NW3, NW5, NW1)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Haverstock
Also in Haverstock
Window mastic in Haverstock: local notes
With historic houses such as Keats House (about 0.8 miles north) nearby, there’s older building stock in the area around Haverstock as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Haverstock is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Schools such as Fine Arts College are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Haverstock is about 1 mile south-east of Hampstead, in Greater London. Wherever you are in the NW3 postcode area, we can carry out window mastic at your property. 764 places in Greater London are on our list.
Jobs for window mastic in NW3, NW5 and NW1 works the same way as everywhere else we cover. Local streets include Eton Road, Lawn Road and Ornan Road, and we cover them all. Nearby, we also carry out window mastic in Belsize Park (1 mile north), Primrose Hill (1 mile south), South Hampstead (1 mile west), Swiss Cottage (1 mile west) and Chalk Farm (1 mile east). We also work in nearby towns such as London (4 miles south-east), Kensington (4 miles south-west), Shoreditch (4 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles east) and Whitechapel (4 miles south-east).
Around Haverstock
Locally, jobs take us to homes and businesses close to Cecil Sharp House, Primrose Hill and St. Mary's Town and Country School. Other local landmarks include St Paul's Church of England Primary School (under half a mile south) and The Washington pub (within half a mile north). Haverstock’s nearest station is South Hampstead station, about 0.7 miles west of the centre. Nearby you will also find Wellington Hospital (0.9 miles south-west) and Isokon Gallery (0.5 miles north). Open spaces near Haverstock include Adelaide Nature Reserve and Primrose Hill.
Why it’s worth doing now in Haverstock
Getting a straight, even bead on an outside frame takes practice, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. 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 Haverstock, the repair is bigger than the sealant job would have been.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why us?
- Over 20 years’ experience
- Approved under the ARBOMaster scheme
- Domestic, commercial and hotel work
- Trusted Arbo and Everbuild sealants
Take a look at what affects the cost or our reviews.
What we can’t put right
Sealant is not the answer to every problem, and we’d rather say so up front. It won’t solve:
- A failed sealed unit that has misted up
- A frame that has rotted at the joint
- Draughts through the window seals rather than the frame
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think before you book.
Surfaces we seal
- uPVC windows
- Composite doors
- Timber windows & doors
- Aluminium frames
- Window sills
- Patio & French doors
Should I try it myself first?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
What happens on the day
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. The job generally takes most of a day for a typical house, less for a few frames, and we explain the cure time before we leave. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Haverstock. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we confirm safe access to each frame.
- 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.
Preparing for the visit
- Mention any parking rules near the property
- Mention any sign-in or site rules at work premises
- Keep children and pets away from the work area
Getting a quote
We quote each job on its own, so start by telling us what you need. Simply call 0345 464 0079 or send us an email and describe the job.
Advice
Different surfaces, different methods
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. Most leaks start at the bottom corners, so we pay close attention there.
Aluminium frames
Coated aluminium needs a compatible sealant and we avoid acetoxy silicones, which can react with some metals. Neutral-cure sealant is the safe choice.
What affects the cost of window mastic
The quote reflects the job in front of us. We take into account:
- How much old sealant there is and how hard it is to remove
- How many areas need sealing
- Working hours on commercial sites
- The number and length of the joints
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Access, such as stairs, a lift or height
- Whether it has been sealed before
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
Want a quote for window mastic? Please phone 0345 464 0079 or email us with a few details. We’ll explain what we’d do and give you a clear price before we start.
Haverstock questions
I let a flat near South Hampstead station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Can you do window mastic in Haverstock?
Yes, Haverstock is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Can I add another job to the visit?
Yes. More than one area can go on one quote.
How long before the joint can be used?
Cure times vary by product. We tell you how long to leave it before we go.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or email us.
How long does it take to reseal the windows on a house?
The work takes a morning for a couple of windows and a door. Access and how stubborn the old mastic is affect the time most.