Greater London · England
Window Mastic in Primrose Hill
Mastic around window and door frames, sills and patio doors in Primrose Hill, with a one-year guarantee on every job. Call for a quick quote.
- Whistling draughts around closed windows
- Damp patches on the reveal after heavy rain
- Draughty joints inside around the window
Window mastic in Primrose Hill, done properly
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. We work on composite doors, patio & French doors and uPVC windows, and the jobs we see most are draughty joints inside around the window and draughts coming in around windows and doors.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Primrose Hill as anywhere.
A 12-month guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- Primrose Hill (NW3, NW1, NW8)
- Wider area
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What window mastic looks like in Primrose Hill
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Primrose Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway. In the older streets around Church of St Mary the Virgin, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you let a flat or house near Kentish Town West station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Primrose Hill is about 1 mile south-east of Hampstead, in Greater London. Homes, rented property, offices and hotels in Primrose Hill can book us for window mastic, old or new, large or small. Every job comes with our 12-month guarantee. Primrose Hill is one of 764 places in Greater London we cover for window mastic.
Jobs for window mastic in NW3, NW1 and NW8 is quoted and booked the same way as anywhere else. That includes homes and businesses on Eton Road, Oval Road and Regal Lane. With the A5205 close by, Primrose Hill is easy for our applicators to reach for window mastic. We also cover the places around Primrose Hill: Haverstock (1 mile north), Belsize Park (1 mile north), Chalk Farm (1 mile north-east), South Hampstead (1 mile west) and Swiss Cottage (1 mile west). Within a short drive, we also cover London (4 miles south-east), Kensington (3 miles south-west), Shoreditch (4 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles east) and Whitechapel (4 miles south-east).
Near you in Primrose Hill
Around Primrose Hill, our work takes us to homes and buildings near Cecil Sharp House, Haverstock School and Regent's Park. Nearby too are St. Mary's Town and Country School (0.5 miles north-west) and Princess of Wales pub (within half a mile east). The nearest railway station is Kentish Town West station, roughly 0.7 miles north-east of the centre. Nearby you will also find Montfichet's Tower (3.1 miles south-east) and Wellington Hospital (0.7 miles south-west). Not far away are Parliament Hill and Adelaide Nature Reserve.
What we do, step by step
A visit follows a simple pattern: we look at the joints together, protect the area around them, do the work and tidy away. Most jobs take most of a day for a typical house, less for a few frames. In Primrose Hill, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we are working on
- Mention any sign-in or site rules at work premises
Get a quote
Want a quote for window mastic? Please ring 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
Landlord and commercial work in Primrose Hill
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
If you manage several properties in or around Primrose Hill, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
What sealant work can’t fix
In fairness, some problems need a different trade:
- Condensation trapped between the panes
- Damp problems in the wall away from the window
- Faulty window hardware
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Surfaces we seal
- uPVC windows
- Patio & French doors
- Window sills
- Composite doors
- Timber windows & doors
- Aluminium frames
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Walk round the house once a year and look at the joints
- Keep paint off silicone joints
- Avoid blasting the frames with a pressure washer
- Keep drainage slots and sill grooves clear
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Your questions about window mastic in Primrose Hill
Can you help a landlord with a rental near Kentish Town West station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Do you cover Primrose Hill for window mastic?
Yes, Primrose Hill is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
How long should I leave it?
It depends on the product and the temperature. Before we leave, we will tell you the cure time.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Do you guarantee window mastic?
Yes, with our 12-month guarantee. Keeping drainage clear and checking the joints yearly helps them last.
Can I paint over the new sealant?
Not if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Do you work on first-floor windows?
Usually, yes. Access is planned before work begins.
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How we quote for window mastic
The price is agreed before any work begins. It’s based on:
- Whether there’s mould to deal with
- Whether the work is at height
- The size of the job
- The number of rooms or windows
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Helping us quote
Before you ask for a quote, have a think about:
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
- A few pictures by email, if you can
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we will take it from there.
What the job involves on each surface
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. If we find rot, we’ll tell you before going ahead, as that is a job for a joiner.
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. Those corners get the most care.
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.