Greater London · England
Window Mastic in Erith
Professional window mastic in and around Erith, with old sealant always removed completely and a one-year guarantee.
- Cold air getting in at the frame edge
- Gaps where the sill meets the wall
- Sealant in the wrong colour for the frame
Windows and doors in Erith
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Historic houses like Hall Place and Gardens (about 2.3 miles south) are a reminder that the area around Erith has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Homes close to Christ Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. As a London address, Erith can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Erith is about 3 miles north-west of Dartford, in Greater London. Every kind of property in Erith is covered for window mastic. The work is guaranteed for a year. Erith is one of 764 towns and villages in Greater London where we work for window mastic. We also work in London, around 11 miles away.
Jobs for window mastic in DA8, DA17 and DA7 is quoted and booked the same way as anywhere else. Streets in the area include Church Road, Town Square and Erith High Street, and we cover them all. Close by, we work in Northumberland Heath (1 mile south), Bexley Riverside (1 mile south), Belvedere (1 mile north-west), Lessness Heath (1 mile north-west) and Barnehurst (1 mile south). We also work in nearby towns such as London (11 miles west), City of Westminster (14 miles west), Marylebone (14 miles west), St Pancras (13 miles west), Shoreditch (11 miles west) and Walthamstow (11 miles north-west).
Around Erith
Typical jobs here are in homes near Trinity School, The Cross Keys pub and Erith School and the streets around them. There’s a railway station in Erith itself: Erith station. Nearby you’ll also find Erith Museum (within half a mile east) and Erith and District Hospital (under half a mile south-west). Green spaces nearby include Crossness Nature Reserve.
About our window mastic in Erith
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through. If the draught is through the window seals instead, we’ll tell you. We work on timber windows & doors, patio & French doors and uPVC windows, and common reasons people get in touch are sealant in the wrong colour for the frame and mastic that has split away from the wall.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or drop us an email.
- Place
- Erith (DA8, DA17, DA7)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Make sure the drainage slots are not blocked
- Avoid blasting the frames with a pressure washer
- Keep timber frames painted
- Ventilate rooms so frames don’t stay wet inside
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
Also near Erith
Also in Erith
Landlords, agents and businesses in Erith
For anyone letting property in or around Erith, jobs at different addresses can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Letting agents and landlords in Erith can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
Erith questions
Can parking be tricky for a visit in Erith?
Parking in Erith, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you cover Erith for window mastic?
Yes, Erith is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
How long does it take to reseal the windows on a house?
That depends on the number of frames, how they’re reached and the state of the old mastic. You will know the timing when we quote.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Do you have sealant for grey or black windows?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
What we are called out for in Erith
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces didn’t grip properly, and it lets go sooner than it should.
People usually contact us after spotting one of these:
- White mastic on grey or black frames
- Rushed sealant from a window installation
- Damp patches on the reveal after heavy rain
- Cracked sealant at the sill ends
Rented homes near Erith station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
What your quote should include
- How long the guarantee is
- Whether they’re fully insured
- Whether the sealant suits the joint
- What happens if the job turns out different
How the visit works
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. It normally takes a few hours for a few frames, or a day or more for a whole house. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- 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.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We will give you a clear price before any work starts.
Related advice
Why deal with it now?
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished. 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 Erith, the repair is bigger than the sealant job would have been.
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts.
Why Erith customers choose us
- Arbo and Everbuild products
- Old sealant always removed completely
- Over 20 years’ experience
- We’re fully insured
Read what affects the cost or our reviews.
How we quote for window mastic
Your quote is based on your job. We look at:
- When we can work, for business premises
- The size of the job
- How many areas need sealing
- The product the joint needs
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- The rough size of the job
- Pictures of the joints, sent by email
- Whether it has been sealed before
- What the problem is, such as mould, gaps, leaks or cracking
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or email us and describe the job, and pictures are welcome.
Different surfaces, different methods
Patio & French doors
Door frames take knocks and movement every time the doors are used. A flexible sealant copes with that.
Aluminium frames
Aluminium moves with heat, and the frames are often slimmer than uPVC. A tidy bead in anthracite grey, black or a matching colour keeps the clean look.