Greater London · England
Window & door mastic in Childs Hill, Greater London
Problem with your window and door frames in Childs Hill? We cut out the old, prepare the joints and apply the right sealant.
- Draughts coming in around windows and doors
- Cracked internal joints between frame and plaster
- Hard, cracked sealant around windows
Window mastic in Childs Hill, done properly
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. If you’re dealing with a bead that doesn’t match the frame and draughts coming in around windows and doors, we can help, whatever the surface.
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.
All of our work is guaranteed for twelve months.
- Where
- Childs Hill (NW2, NW3, NW11)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Childs Hill and across Greater London. Several sites can go on one quote, and we’re fully insured for the work.
In hotels, rooms out of use cost money, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The size of the job
- How many areas need sealing
- The old material and how stubborn it is
- How easy the joints are to reach
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
What to tell us for a quote
When you contact us, these details help:
- Access, such as stairs, a lift or height
- If someone has resealed it before
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
There’s no standard price list. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or drop us an email.
What we cannot put right
New sealant can’t fix everything, and we’d rather say so up front. Sealant won’t put right:
- Penetrating damp from a failed cavity tray or render
- Broken hinges, locks or handles
- Worn gaskets, brush seals or a door that has dropped
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Timber windows & doors
- Window sills
- uPVC windows
- Patio & French doors
- Aluminium frames
- Composite doors
Nearby places to Childs Hill
More services for Childs Hill
The process
The work is kept neat and contained to the area we are working on. The job generally takes a morning for a couple of windows and a door, 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 Childs Hill. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about parking restrictions
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Read more
Leave it or put it right?
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Childs Hill, the repair is bigger than a sealant job.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why us?
- Tidy, careful work
- Arbo and Everbuild products
- Homes, businesses and hotels
- We never seal over old sealant
See our cost guide and what customers say.
Childs Hill: your questions answered
Do you work for landlords with property near Cricklewood station?
Yes. We work for landlords and agents as well as householders. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Can parking be tricky for a visit in Childs Hill?
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.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
How many windows can you do in a day?
Allow anything from an hour or two to a full day, depending on how many frames there are. Access and how stubborn the old mastic is affect the time most.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we will tell you.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do I have to be there?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Window mastic in Childs Hill: local notes
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Letting a property close to Cricklewood station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Schools such as All Saints' CofE Primary School NW2 are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Childs Hill is about 1 mile north-west of West Hampstead, in Greater London. Wherever you are in the NW2 postcode area, we can carry out window mastic at your property. We cover 764 towns and villages across Greater London, large and small. We also work in London, about 6 miles from Childs Hill.
Jobs for window mastic in NW2, NW3 and NW11 is quoted and booked the same way as anywhere else. Whether your property is on Nant Road, Ridge Road and Garth Road or anywhere close by, we can help. We also cover the places around Childs Hill: Fortune Green (1 mile south), West Hampstead (1 mile south-east), Golders Green (1 mile north), North End (1 mile north-east) and Vale of Health (1 mile east). We also work in nearby towns such as London (6 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (6 miles south-east).
Near you in Childs Hill
Locally, jobs take us to homes and businesses close to St Vedasts School For Boys, Hampstead School and The Old Bull and Bush pub. The nearest railway station is Cricklewood station, about 0.7 miles south-west. A little further out are O2 Centre (1.2 miles south-east) and New End Hospital (0.9 miles east). Green spaces nearby include Parliament Hill and Westbere Copse.
What the job involves on each surface
Window sills
Where a sill meets brick or render, the ends often crack first. We reseal them so rain cannot run into the wall.
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall and tooled smooth.
Do you need window mastic in Childs Hill?
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Look out for any of the following:
- Draughts coming in around windows and doors
- Black, perished sealant on frames
- Sealant in the wrong colour for the frame
- Water coming in at the bottom corners of a door
If you live in an older home near All Saints, the joint between an old wall and a newer frame is normally the first place rain gets in.
What to look for in a quote
- The length of the guarantee
- Whether the sealant suits the joint
- Is VAT in the price?
- Whether you can choose the colour