Greater London · England
Plumstead Window Mastic
Professional window mastic in and around Plumstead, with old sealant always removed completely.
- A bead that does not match the frame
- Water coming in at the bottom corners of a door
- Whistling draughts around closed windows
How we handle window mastic in Plumstead
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. We work on timber windows & doors, uPVC windows and aluminium frames, and common reasons people get in touch are old mastic that has gone black or come away and draughty joints inside around the window.
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, in Plumstead as anywhere.
All of our work is guaranteed for twelve months.
- Location
- Plumstead (SE18, SE28, E16)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Composite doors
A composite door usually sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.
Landlord and commercial work in Plumstead
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.
Housing providers, facilities teams and property managers book us too in Plumstead and across Greater London. Several sites can go on one quote.
Signs you need window mastic in Plumstead
Timber windows bring their own problems. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
The most common problems we see are:
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
- Mastic that has split away from the wall
- Leaking joints at the ends of sills
Plumstead is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Before you book anyone
- How the joint is cleaned and prepared
- Who turns up on the day
- What happens if the job turns out different
- The length of the guarantee
How it works
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually 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. Mention any building rules, key holders or managing agents when you book.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Plan for the work area to be out of bounds to pets and children
- Mention if the joints have been sealed before
How to get a quote
There’s no standard price list, because every job is different. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or drop us an email.
Advice
Why it’s worth doing now in Plumstead
Choosing the product is half the job. Interior caulk and bathroom silicone aren’t made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Plumstead, the repair is bigger than the sealant job would have been.
Instead of a standard rate, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
What you get with us
- Rated 4.9 stars on Google
- A sealant colour to suit the surroundings
- A choice of colours where the product allows
- Arbo and Everbuild products
Take a look at our cost guide or what customers say.
How we quote for window mastic
The price is agreed before any work begins. It’s based on:
- How easy the joints are to reach
- The product the joint needs
- The number of rooms or windows
- The amount of work
What you pay reflects the work, not guesswork. That’s why we ask a few questions first.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- The problem you’ve noticed
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
- Where the job is, and your postcode
We quote each job on its own, so the first step is telling us about yours. Just call 0345 464 0079 or email us with the details.
How to look after the new joints
A little care helps the new joints last. We recommend:
- Check the mastic once a year
- Ventilate rooms so frames do not stay wet inside
- Do not paint over the silicone
- Don’t use solvent cleaners on the joint
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just call 0345 464 0079 or send us an email.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
Common questions in Plumstead
Can parking be tricky for a visit in Plumstead?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you cover Plumstead for window mastic?
Yes. Our work covers London and the South East, and Plumstead is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Can landlords and businesses book you?
Yes. Domestic, commercial and hotel work are all part of what we do, and we are fully insured.
What do you need from me for a quote?
A short description and the location, with photos by email if possible. If we need more, we’ll ask.
Is the new sealant paintable?
Silicone generally won’t take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Which products do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Does the work come with a guarantee?
Yes. Each job is covered for 12 months, inside or out.
Also near Plumstead
What else we do in Plumstead
Plumstead homes and the weather
With historic houses such as Danson House (about 2.7 miles south-east) nearby, there’s older building stock in the area around Plumstead 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’s traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you look after a building such as South Rise Primary School, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Plumstead station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Plumstead is about 8 miles east of London, in Greater London. We provide window mastic to homes and businesses in Plumstead and nearby, as part of our work across Greater London. Plumstead is one of 764 places in Greater London where we work. There’s also a page for London, about 8 miles away.
Here we cover the SE18, SE28 and E16 postcode area for window mastic. Whether your property is on Moy Lane, Love Lane and Tuam Road or a nearby road, we can help. With the A206 close by, Plumstead is simple for us to get to. If you are just outside Plumstead, we cover Woolwich (1 mile west), Shooter's Hill (1 mile south-west), East Wickham (1 mile south-east), Charlton (2 miles west) and New Charlton (2 miles west). Larger places within reach include London (8 miles west), City of Westminster (10 miles west), Marylebone (10 miles west), Kensington (12 miles west), St Pancras (9 miles west) and Shoreditch (7 miles west).
Landmarks near Plumstead
Around Plumstead, our work takes us to homes and buildings near Shooters Hill Sixth Form College, Plumstead Manor School and Plumstead Common, among other places. Plumstead has its own railway station: Plumstead station. Other landmarks nearby include British Hospital for Mothers and Babies (1.3 miles west) and Greenwich Castle (3.6 miles west). The countryside around Plumstead includes Gilbert's Pit.