Kent · England
Swanley Window Mastic
Our applicators work in Swanley on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly.
- Draughty joints inside around the window
- Gaps where the sill meets the wall
- Untidy mastic left by window fitters
About our window mastic in Swanley
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. We work on window sills, patio & French doors and composite doors, and the jobs we see most are black, perished sealant on frames and rushed sealant from a window installation.
Around Swanley, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Swanley (BR8)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. Homes in smaller places like Swanley can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, call 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why Swanley customers choose us
- Homes, businesses and hotels
- A choice of colours where the product allows
- An ARBOMaster approved applicator
- We’re fully insured
Take a look at our cost guide or what customers say.
What affects the quote in Swanley
We don’t publish a price list. What we look at:
- Whether old sealant or filler has to be cut out
- Any working-time requirements on site
- The amount of work
- Whether the work is at height
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- Roughly how big the job is
- Where the property is
- Photos by email, if that’s easy
- The problem you’ve noticed
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
What happens on the day
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours for a few frames, or a day or more for a whole house. In a smaller place like Swanley, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- 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.
Before we arrive
- Let us know about earlier repairs to the joints
- Clear items away from the joints we are working on
- Keep children and pets away from the work area
How to get a quote
For window mastic in Swanley, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
Towns and villages near Swanley
More services for Swanley
Work for landlords, hotels and businesses
Letting agents and landlords in Swanley can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
FAQs for Swanley
Is Swanley in your area for window mastic?
Yes, Swanley is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
I let a flat near Swanley station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Is there any odour?
It depends on the product. Some smell for a while, some hardly at all.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
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. You’ll get a timescale with the quote.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status.
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.
Will new mastic stop draughts?
If the draught is coming in around the frame, yes. If it’s through the window’s own seals or a hinge, that’s a different fix, and we will say so.
Windows and doors in Swanley
Historic houses like Lullingstone Castle (about 2.9 miles south) are a reminder that the area around Swanley has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as St Bartholomew's Catholic Primary School, its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near St Mary the Virgin, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Swanley is about 3 miles east of Orpington, in Kent. For window mastic in and around Swanley, it’s easy to get a quote: please phone 0345 464 0079 or drop us an email. We are based in Crawley and cover Kent, Swanley included. Swanley is one of 922 places in Kent we cover for window mastic. There’s also a page for London, about 14 miles away.
Here we cover the BR8 postcode area for window mastic. If you need window mastic at a property on London Road, Station Road and High Street or anywhere close by, our applicators can take on the job. Main roads around Swanley include the A20 and B258, which makes travel easy. Neighbouring places we cover for window mastic include Crockenhill (1 mile south-west), Kevington (2 miles south-west), Derry Downs (3 miles west), St Mary Cray (3 miles west) and St Paul's Cray (3 miles west). Within a short drive, we also cover Dartford (4 miles north-east), Sevenoaks (8 miles south), Gravesend (9 miles east), Tonbridge (14 miles south), Northfleet (8 miles east) and Kings Hill (13 miles south-east).
Landmarks near Swanley
We work in homes and buildings around Orchards Academy, among other places. Swanley has its own railway station: Swanley station. A little further out are London Borough of Bromley Museum (3.2 miles south-west) and Queen Mary's Hospital (3.4 miles north-west). Not far away are The Warren and Summer Hill.
Do you need window mastic in Swanley?
Every frame moves through the day. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. A sealant that can’t keep up eventually tears.
People generally contact us after spotting one of these:
- Sealant in the wrong colour for the frame
- Old mastic that has gone black or come away
- Leaking joints at the ends of sills
- Rushed sealant from a window installation
For landlords with property near Swanley station, renewing tired window mastic between tenants heads off draught and damp complaints.
Comparing quotes
- Which colour the sealant will be
- Is the old sealant removed completely?
- What product goes in the joint
- Whether VAT is included
Aftercare tips
To keep the joints looking good and working properly:
- Make sure the drainage slots aren’t blocked
- Don’t use solvent cleaners on the joint
- Repaint timber before it’s bare
- Ventilate rooms so frames do not stay wet inside
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
Leaks usually show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Surface by surface
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
Composite doors
Composite doors are normally hung in an uPVC-type frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.