Kent · England
Window Mastic in Crayford
Window and door frames in Crayford need attention? We remove the old material, prepare the joints and seal them properly.
- Rain getting in at the frame or under the sill
- Leaking joints at the ends of sills
- Rushed sealant from a window installation
Window mastic in Crayford, done properly
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. Typical jobs include rain getting in at the frame or under the sill and old mastic that has gone black or come away, on timber windows & doors, aluminium frames and uPVC windows.
Many houses in smaller places like Crayford have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows, and any older timber or sash windows need a sealant that suits them.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Location
- Crayford (DA1, DA5, DA7)
- Wider area
- Kent
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What the job involves on each surface
Timber windows & doors
Where timber has rotted at the joint, it needs repairing first. We’ll point out any rot we find, as that is a job for a joiner.
Window sills
Where a sill meets brick or render, the ends often crack first. We reseal them so rain cannot run into the wall.
Also near Crayford
Other services in Crayford
When something else is needed
In fairness, there are a few things sealant won’t fix:
- Faulty window hardware
- Rotten timber, which needs a joiner first
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Timber windows & doors
- Window sills
- uPVC windows
- Composite doors
- Aluminium frames
- Patio & French doors
Crayford: your questions answered
Is Crayford within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is Crayford in your area for window mastic?
Yes, Crayford is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or email us.
Can you seal the gap between the frame and the plaster indoors?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Does the work come with a guarantee?
Yes, for 12 months. Keeping drainage clear and checking the joints yearly helps them last.
How long does it take to reseal the windows on a house?
A few frames take a few hours, while a whole house takes longer. We confirm the timing with your quote.
Will new mastic stop draughts?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we will tell you.
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Keep paint and stain on wooden frames in good order
- Do not use solvent cleaners on the joint
- Do not aim a pressure washer at the joints
- Look round the frames every year or so
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
What we do, step by step
We bring everything the job needs with us, so you don’t need to buy or prepare anything. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours for a handful of frames, longer for a whole house. Parking around Crayford is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- 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.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Mention any parking rules near the property
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about stairs, lifts or work at height
How to get a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
Read more
What affects the cost of window mastic
The quote reflects the job in front of us. We take into account:
- Working hours on commercial sites
- The number of rooms or windows
- Access and height
- Any mould that needs treating
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- How many joints, rooms or windows are involved
- How we’d reach the joints
- Pictures of the joints, sent by email
- The problem you’ve noticed
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Frames and glazing around Crayford
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Hall Place and Gardens (about 0.9 miles west) are a reminder that the area around Crayford 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 is traditional sand mastic.
Rented homes near Crayford 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. If you live in an older home near Church of St Paulinus, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Crayford is about 2 miles west of Dartford, in Kent. For window mastic in and around Crayford, it’s easy to get a quote: please ring 0345 464 0079 or email us. We’re based in Crawley and cover Kent. Crayford is one of 922 towns and villages in Kent we cover. You can also see our page for London, roughly 12 miles from Crayford.
We work across DA1, DA5 and DA7 for window mastic. Window mastic is available to properties on Swan Lane, Dale Road and Ross Road and the roads around them. We also cover the places around Crayford: Bowmans (1 mile south), Barnes Cray (1 mile north-east), Barnehurst (1 mile north-west), Coldblow (1 mile south-west) and Wilmington (1 mile south). Larger places within reach include Sevenoaks (12 miles south), Gravesend (9 miles east), Northfleet (7 miles east), Swanley (4 miles south), Swanscombe (5 miles east) and Windmill Hill (8 miles east).
Landmarks near Crayford
Around Crayford, our work takes us to homes and buildings near Haberdashers' Aske's Crayford Academy, The Bear and Ragged Staff pub and St Catherine's Catholic School and the streets around them. Crayford has its own railway station: Crayford station. Nearby you will also find Bexley Museum (0.9 miles west) and West Hill Hospital (1.3 miles east). Not far away are Wansunt Pit.
Do you need window mastic in Crayford?
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. If the sealant cannot stretch, it splits.
The most common problems we see are:
- Whistling draughts around closed windows
- Water coming in at the bottom corners of a door
- Cracked internal joints between frame and plaster
- A bead that doesn’t match the frame
Schools such as Wentworth Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Comparing quotes
- Who turns up on the day
- Whether VAT is included
- How long the guarantee is
- Which colour the sealant will be