Greater London · England
Window Mastic in The Burroughs
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in The Burroughs. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps left after new windows were fitted
- Gaps where the sill meets the wall
- White mastic on grey or black frames
How we handle window mastic in The Burroughs
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that cannot flex, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. If you have damp patches on the reveal after heavy rain and untidy mastic left by window fitters, we can help, on timber windows & doors, patio & French doors and aluminium frames alike.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
You get a 12-month guarantee, the same in The Burroughs as everywhere else we work.
- Location
- The Burroughs (NW4, NW9, NW11)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
FAQs for The Burroughs
Is parking a problem for a job in The Burroughs?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Can you help a landlord with a rental near Hendon station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or email us with the details for a clear quote.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Do you work in The Burroughs?
Yes. We work in The Burroughs and the rest of Greater London. To book, ring 0345 464 0079 or drop us an email.
Where are you based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
Signs you need window mastic in The Burroughs
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, while a joint packed solid cannot stretch. Backing rod sets the right depth.
Any of these means the joints need attention:
- Rushed sealant from a window installation
- Old mastic that has gone black or come away
- Whistling draughts around closed windows
- White mastic on grey or black frames
As a London address, The Burroughs can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- Is the old sealant removed completely?
- How long the guarantee is
- How the joint is cleaned and prepared
- Who does the work, and how experienced they are
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Do not aim a pressure washer at the joints
- Make sure the drainage slots are not blocked
- Check the mastic once a year
- Keep timber frames painted
Keep sill grooves and drainage slots clear, so water can run away instead of sitting against the joint.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Different surfaces, different methods
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones aren’t used, as they can attack some metals. We use a neutral-cure product.
Window sills
Where a sill meets brick or render, the ends often crack first. We reseal them so rain can’t run into the wall.
Leave it or put it right?
Getting a straight, even bead on an outside frame takes practice, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Doing several joints on one visit usually makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
What you get with us
- Homes, businesses and hotels
- A 12-month guarantee on all work
- ARBOMaster approved applicator
- We leave the area clean and tidy
Read what affects the cost or what customers say.
The Burroughs homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For site and facilities teams at buildings such as St Joseph's Catholic Primary School, larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as St Mary's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
The Burroughs is about 2 miles south-east of Burnt Oak, in Greater London. Whether you are in the middle of The Burroughs or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Our area takes in 764 places across Greater London, from the larger towns to small villages. We also work in London, about 8 miles from The Burroughs.
Here we cover the NW4, NW9 and NW11 postcode area for window mastic. You will find streets such as Bell Lane, Eaton Road and Lodge Road. You will find The Burroughs on the A41, so it’s easy for us to get to with everything needed for window mastic. If you are just outside The Burroughs, we cover Hendon (1 mile south-east), Colindale (1 mile west), Brent Cross (1 mile south-east), West Hendon (1 mile south-west) and The Hyde (1 mile south-west). We also work in nearby towns such as London (8 miles south-east), City of Westminster (6 miles south-east), Marylebone (6 miles south-east), Kensington (6 miles south), St Pancras (6 miles south-east) and Shoreditch (8 miles south-east).
Local landmarks in The Burroughs
We work in homes and buildings around The Claddagh Ring pub, Brampton College and Kisharon College. The Burroughs’s nearest station is Hendon station, about 0.8 miles south-west of the centre. Well-known places in the area include Church Farmhouse Museum (under half a mile north) and Brent Cross Shopping Centre (0.8 miles south). Not far away are Parliament Hill and Darland's Lake.
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- The type of sealant required
- Whether the work is at height
- Mould in or behind the old joints
- How much there is to do
Leaving a failed joint usually makes the job bigger, not smaller. If you’re unsure, call 0345 464 0079 or send us an email for an honest opinion and a quote.
What to tell us for a quote
When you contact us, these details help:
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
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.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The work itself takes anything from an hour or two to a full day, depending on how many frames there are from start to finish. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in The Burroughs. It helps if you can point us to a visitor permit or a bay close to the door.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Keep children and pets away from the work area
- Move anything stored near the joints
- Let us know if you’ve seen damp or leaks
Ask for a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before any work starts.