Greater London · England
Window & door mastic in Upton, Greater London
Mastic around window and door frames, sills and patio doors in Upton, with a one-year guarantee on every job. Ask us for a quote.
- A bead that does not match the frame
- Gaps left after new windows were fitted
- Whistling draughts around closed windows
How we handle window mastic in Upton
Over two decades of sealing frames has taught us which products suit which walls. We’re ARBOMaster approved and fully insured, and every job is covered by a 12-month guarantee. We work on window sills, patio & French doors and aluminium frames, and the jobs we see most are draughty joints inside around the window and hard, cracked sealant around windows.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
You are covered for a year from the day we finish. If anything is not right with it, call 0345 464 0079 or send us an email.
- Place
- Upton (DA6, DA7, DA16)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Upton questions
Is parking an issue for window mastic in Upton?
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 you cover Upton for window mastic?
Yes. Our work covers London and the South East, and Upton is part of that. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Do the sealants smell?
Possibly a little. It fades as the sealant cures.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
Should I try DIY first?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Will new mastic stop draughts?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we will tell you.
How many windows can you do in a day?
That depends on the number of frames, how they’re reached and the state of the old mastic. We will tell you how long your job needs when we quote.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is normally more efficient, so mention them when you ask for a quote.
Window mastic in Upton: local notes
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. With historic houses such as Red House (about 0.3 miles south-west) nearby, there’s older building stock in the area around Upton as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you look after a building such as Upland Primary School, its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Bexleyheath station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Upton is about 1 mile east of Welling, in Greater London. Wherever you are in the DA6 postcode area, our applicators can take on window mastic. Upton is one of 764 towns and villages in Greater London where we work. There’s also a page for London, roughly 10 miles from Upton.
We cover every part of DA6, DA7 and DA16 for window mastic and the streets around it. If you need window mastic at a property on Lion Road, Upton Road and Freta Road or a nearby road, we can help. Close by, we work in Bexleyheath (1 mile east), Crook Log (1 mile west), Blendon (1 mile south-west), Bexley (1 mile south) and Welling (1 mile west). Further out, we also cover London (10 miles west), City of Westminster (13 miles west), Marylebone (13 miles west), Kensington (15 miles west), St Pancras (12 miles north-west) and Shoreditch (10 miles north-west).
Local landmarks in Upton
Locally, jobs take us to homes and businesses close to St Catherine's Catholic School, Danson Park and Bexleyheath Academy, among other places. There’s a railway station in Upton itself: Bexleyheath station. Other landmarks nearby include Bexley Hospital (within half a mile south-west) and Broadway Shopping Centre (0.5 miles south-east). Not far away are Summer Hill and Wansunt Pit.
Leave it or put it right?
Failed mastic is not a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that is needed. Problems with the glass or gaskets are for a window company, and we will say so. In a flat in Upton, failed sealant seldom stays inside your own four walls: 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 is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear quote for the lot.
Why us?
- An ARBOMaster approved applicator
- We are fully insured
- Domestic, commercial and hotel work
- We agree the colour with you first
Landlord and commercial work in Upton
If you manage several properties in or around Upton, several properties can be quoted together. Send us the addresses and the work at each, and photos by email help.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
The process
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. Expect the work to take anything from an hour or two to a full day, depending on how many frames there are, and we tell you how long to leave it before we go. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Upton. A visitor permit or a nearby bay makes the visit run more smoothly.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Plan for the work area to be out of bounds to pets and children
- Move anything stored near the joints
Getting a quote
Every job is quoted individually, so the first step is telling us about yours. Just phone 0345 464 0079 or send us an email with the details and send photos if you have them.
Related advice
Nearby places to Upton
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How the job changes by surface
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. They’re cut out and resealed with exterior sealant.
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. We cut it out, back any deep gaps and reseal properly.
When to call us in Upton
Timber windows bring their own problems. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
Most people get in touch when they notice one of these:
- Water coming in at the bottom corners of a door
- Hard, cracked sealant around windows
- Cracked sealant at the sill ends
- A bead that does not match the frame
If you live in an older home near Trinity Baptist Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What your quote should include
- How the joint is cleaned and prepared
- What happens if they find a problem under the old sealant
- How the colour is chosen
- How long to leave it before use
What affects the cost of window mastic
Jobs vary more than people expect. The main factors:
- The old material and how stubborn it is
- How many areas need sealing
- Access and height
- Mould in or behind the old joints
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
- The type of property
- If someone has resealed it before
For window mastic in Upton, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Don’t paint over the silicone
- Ventilate rooms so frames do not stay wet inside
- Walk round the house once a year and look at the joints
- Avoid blasting the frames with a pressure washer
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Leaks usually show up in wet, windy weather, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.