Greater London · England
Window & door mastic in West Hampstead, Greater London
Window mastic in West Hampstead from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Mastic that’s falling out in pieces
- Cold air getting in at the frame edge
- Water coming in at the bottom corners of a door
How we quote for window mastic
There’s no set price list, because no two jobs are the same. What we look at:
- The product the joint needs
- Any mould that needs treating
- The size of the job
- Whether the work is at height
Combining jobs into one visit generally makes better use of the time than several visits. You will get one clear quote for the whole job.
What we need to know
What to tell us when you ask for a quote:
- If it’s domestic, commercial or a hotel
- A few photos by email, if you can
- Access, such as stairs, a lift or height
- If someone has resealed it before
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Window mastic in West Hampstead
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty. If the draught is through the window seals instead, we will tell you. We are often asked to deal with rain getting in at the frame or under the sill and white mastic on grey or black frames, on patio & French doors, timber windows & doors and aluminium frames.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first, and access in West Hampstead is something to talk through when you book.
You get a 12-month guarantee, the same in West Hampstead as everywhere else we work.
- Where
- West Hampstead (NW3, NW6, NW2)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Questions from West Hampstead
Do you work for landlords with property near Finchley Road & Frognal station?
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 work begins.
Is parking an issue for window mastic in West Hampstead?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Do the sealants smell?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Will new mastic stop draughts?
It will if the frame joint is the problem. We check where the draught is before we start.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Do you work in West Hampstead?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland.
Also near West Hampstead
What else we do in West Hampstead
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. Our tips:
- Ventilate rooms so frames don’t stay wet inside
- Keep jet washers away from the mastic
- Repaint timber before it’s bare
- Paint up to the joint, not over it
Keep the new mastic undisturbed while it cures, following the cure time we give you. Keep jet washers away from the frames.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. Resealing closes it.
Signs you need window mastic in West Hampstead
Water runs down the glass onto the sill, and the ends of the sill, where it meets the wall, are where it gets in. When that sealant fails, water gets into the wall or under the frame.
Look out for any of the following:
- Gaps where the sill meets the wall
- Old mastic that has gone black or come away
- A bead that doesn’t match the frame
- Gaps left after new windows were fitted
If you look after a building such as Emmanuel Church of England Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- What product goes in the joint
- Whether VAT is included
- Whether all the old sealant comes out first
- How much experience the applicator has
Surface by surface
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We’ll point out any rot we find, as a joiner will need to deal with it.
Composite doors
Draughts round the door leaf generally come from worn seals or adjustment, not the mastic. We will tell you if that is what we find.
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Soft or decayed wood in the frame
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Broken hinges, locks or handles
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Aluminium frames
- Timber windows & doors
- Composite doors
- Patio & French doors
- uPVC windows
- Window sills
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 matched to the joint and its conditions, and the work is guaranteed for a year.
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.
Window mastic in West Hampstead: local notes
Historic houses like Fenton House (about 0.5 miles north-east) are a reminder that the area around West Hampstead 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. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
For an older house near a landmark such as Presbyterian Church Of St Andrew, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. As a London address, West Hampstead can be tricky for parking: let us know about parking bays, permits or a driveway.
West Hampstead is about 3 miles north-west of City of Westminster, in Greater London. We carry out window mastic for homes and businesses in West Hampstead and the surrounding area, as part of our work across Greater London. Our area takes in 764 places across Greater London. London is on our list too, about 6 miles from West Hampstead.
All of NW3, NW6 and NW2 is within our area for window mastic. You’ll find streets such as Mill Lane, Acol Road and Ajax Road. West Hampstead sits on or near the A502. Close by, we work in Fortune Green (1 mile west), Hampstead (1 mile east), Greenhill (1 mile east), Childs Hill (1 mile north-west) and Vale of Health (1 mile north-east). Further out, we also cover London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles east).
Near you in West Hampstead
Locally, jobs take us to homes and businesses close to South Hampstead High School, Holly Bush pub and Kilburn Grange Park, among other places. West Hampstead has its own railway station: Finchley Road & Frognal station. A little further out are Isokon Gallery (1.2 miles east) and New End Hospital (0.5 miles north-east). For a walk, there’s Parliament Hill and Westbere Copse.
What we do, step by step
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a morning for a couple of windows and a door. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- Each frame is looked over and we agree which ones need resealing.
- 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.
Preparing for the visit
- Tell us about any water getting in
- On commercial sites, let us know about site rules
- Move anything stored near the joints
Ask for a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job.