Greater London · England
Window & door mastic in Chalk Farm, Greater London
Window and door frames in Chalk Farm need attention? We remove the old material, prepare the joints and seal them properly.
- Gaps left after new windows were fitted
- Mastic that is falling out in pieces
- Leaking joints at the ends of sills
Window mastic in Chalk Farm
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’s why the joint needs a flexible, low-modulus sealant rather than something rigid. Typical jobs include black, perished sealant on frames and white mastic on grey or black frames, across window sills, aluminium frames and patio & French 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 Chalk Farm.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Chalk Farm (NW5, NW1, NW3)
- Region
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We’ll point out any rot we find, as that’s a job for a joiner.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal and we avoid acetoxy silicones, which can react with some metals. Neutral-cure sealant is the safe choice.
Do you need window mastic in Chalk Farm?
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
Most people get in touch after spotting something like this:
- A bead that does not match the frame
- Mastic that’s falling out in pieces
- Rain getting in at the frame or under the sill
- Hard, cracked sealant around windows
Rented homes near Kentish Town West station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Questions to ask before you book
- Whether VAT is included
- How the joint is cleaned and prepared
- Who does the work, and how experienced they are
- Whether you can choose the colour
Why it’s worth doing now in Chalk Farm
The work is quick compared with the damage it prevents: the visit takes most of a day for a typical house, less for a few frames. Leave it until water is coming in and you may need plastering and decorating as well. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Chalk Farm, the repair is bigger than the sealant job would have been.
Combining jobs into one visit generally makes better use of the time than several visits. We’ll give you a clear quote for the lot.
Why book with us
- ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
- Tidy, careful work
- Arbo and Everbuild products
Places near Chalk Farm
Also in Chalk Farm
Chalk Farm questions
Do you cover Chalk Farm for window mastic?
Yes, Chalk Farm is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
Can you help a landlord with a rental near Kentish Town West station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
When is the sealant fully cured?
Cure times vary by product and the conditions. We tell you how long to leave it before we go.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can you seal the gap between the frame and the plaster indoors?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
Do the sealants smell?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Quotes for window mastic in Chalk Farm
We do not publish a price list, because jobs vary so much. The quote depends on:
- The number of rooms or windows
- How easy the joints are to reach
- The amount of work
- Any working-time requirements on site
What you pay reflects the work, not a rough estimate. That is why we ask a few questions first.
What to tell us for a quote
To help us quote quickly, let us know:
- Where the property is
- A few photos by email, if you can
- If someone has resealed it before
- What’s wrong with the joints now
Getting a quote is simple: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we will take it from there.
Work for landlords, hotels and businesses
Letting agents and landlords in Chalk Farm can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Aftercare tips
After the cure time, these simple habits help:
- Wipe condensation off the frames
- Wash the frames with mild soapy water
- Look round the frames every year or so
- Keep paint off silicone joints
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
Windows and doors in Chalk Farm
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. With historic houses such as Winfield House (about 1.1 miles south-west) nearby, there’s older building stock in the area around Chalk Farm as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Managing a site like Haverstock School? Then larger buildings have plenty of frames, and the mastic around each one ages. Chalk Farm is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Chalk Farm is about 1 mile south-east of Hampstead, in Greater London. If you need window mastic in Chalk Farm, please phone 0345 464 0079 or email us for a quick quote. We cover Greater London from our Crawley base. Across Greater London, we cover 764 places, Chalk Farm among them.
Work in NW5, NW1 and NW3 works the same way as everywhere else we cover. Local streets include Eton Road, Oval Road and Regal Lane, all of which we cover. Chalk Farm is on the A5205, which makes it straightforward to reach. Neighbouring places we cover for window mastic include Kentish Town (1 mile east), Primrose Hill (1 mile south-west), Haverstock (1 mile west), Belsize Park (1 mile west) and Camden Town (1 mile south-east). Further out, we also cover London (4 miles south-east), Kensington (4 miles south-west), Shoreditch (3 miles east), Walthamstow (6 miles north-east), Hoxton (3 miles east) and Whitechapel (4 miles south-east).
Near you in Chalk Farm
Locally, jobs take us to homes and businesses close to Primrose Hill, Cecil Sharp House and The Fiddlers Elbow Public House. Also close by are Holy Trinity and Saint Silas CofE Primary School (less than half a mile east) and North Bridge House School (0.5 miles south-east). There’s a railway station in Chalk Farm itself: Kentish Town West station. Well-known places in the area include Isokon Gallery (0.7 miles north-west) and O2 Centre (1.3 miles west). Green spaces nearby include Primrose Hill and The Long Water.
How the visit works
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes anything from an hour or two to a full day, depending on how many frames there are. For a job in Chalk Farm, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.