Kent · England
Window & door mastic in Southborough, Kent
Problem with your window and door frames in Southborough? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Cracked internal joints between frame and plaster
- Sealant in the wrong colour for the frame
- Rushed sealant from a window installation
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
About our window mastic in Southborough
Homes in Southborough have every kind of window: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. If you’re dealing with white mastic on grey or black frames and cracked sealant at the sill ends, we can help, on patio & French doors, aluminium frames and window sills alike.
Many houses in smaller places like Southborough have conservatories, garden rooms or patio doors. Their glazing joints and frame seals are as much a part of the job as the windows.
A one-year guarantee comes as standard.
- Place
- Southborough (TN4, TN2)
- Region
- Kent
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
Surface by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We seal the frame and let you know about anything else.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
Southborough questions
I let a flat near High Brooms 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.
Can you do window mastic in Southborough?
Yes. We work across London and the South East, and Southborough is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Do I have to be there?
If the work is inside, we need someone to let us in. Once we’ve agreed the job, you don’t need to watch us work.
How many windows can you do in a day?
The work takes most of a day for a typical house, less for a few frames. Access and the amount of old mastic make the biggest difference.
Where are you based?
Mr Mastic is based in Crawley. We cover Southborough and the rest of Kent, along with the rest of our area.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
Do you seal inside as well as outside?
Yes. Draughts often come through the inside gap too, so sealing both is often worthwhile.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator.
Southborough homes and the weather
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Penshurst Place (about 3.5 miles west) are a reminder that the area around Southborough has older buildings as well as new. 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.
For site and facilities teams at buildings such as Southborough CofE Primary School, the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near High Brooms station, renewing tired window mastic between tenants heads off draught and damp complaints.
Southborough is about 1 mile north of Royal Tunbridge Wells, in Kent. Across the TN4 area, we can carry out window mastic at your property. Southborough is one of 922 towns and villages in Kent where we work. There’s also a page for Crawley, about 20 miles away.
We cover every part of TN4 and TN2 for window mastic and the streets around it. Streets in the area include London Road, Church Road and Norton Road. Southborough is on the A26, so it’s easy for us to get to with everything needed for window mastic. We also cover High Brooms (1 mile south-east), Stockland Green (1 mile west), Bidborough (1 mile north-west), Royal Tunbridge Wells (1 mile south) and Speldhurst (2 miles west). Larger places within reach include Maidstone (14 miles north-east), Sevenoaks (9 miles north), Tonbridge (3 miles north), Kings Hill (10 miles north-east), Foley Park (15 miles north-east) and Paddock Wood (6 miles east).
Near you in Southborough
In Southborough, that means homes and buildings near Barnett's Wood, St Gregory's Catholic School and Flying Dutchman pub and the streets around them. For rail, the closest station is High Brooms station, roughly 1 mile south-east. Nearby you’ll also find Kent and Sussex Hospital (1.4 miles south) and Tonbridge Castle (2.8 miles north). Not far away are Tudeley Woods RSPB reserve and Barden Lake.
What we do, step by step
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes most of a day for a typical house, less for a few frames. Parking around Southborough is usually 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.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Clear items away from the joints we are working on
- For business premises, tell us about site rules or sign-in
- Let us know about earlier repairs to the joints
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Advice
What affects the quote in Southborough
The quote reflects the job in front of us. We take into account:
- Working hours on commercial sites
- Which sealant suits the joint
- How easy the joints are to reach
- Whether old sealant or filler has to be cut out
The cost reflects the work involved, not a rough estimate. That’s why we ask about the job first.
Asking for a quote
When you call or email, it’s useful to know:
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- Any previous sealing or DIY work
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or email us.
Nearby places to Southborough
Also in Southborough
Common problems we fix in Southborough
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, and a gap opens along one edge.
If you can see any of these, it’s time to have the joints looked at:
- Whistling draughts around closed windows
- Cracked sealant at the sill ends
- Mastic that has split away from the wall
- Draughty joints inside around the window
In the older streets around Christ Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before you book
- How long to leave it before use
- Is the old sealant removed completely?
- How the joint is cleaned and prepared
- What the quote includes, VAT included or not
Why it’s worth doing now in Southborough
Running fresh sealant over the old joint is tempting, but it will not grip old, dirty sealant. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. In a smaller place like Southborough, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. We will send you a clear quote for the lot.
Why book with us
- Sealant colour chosen to suit
- 12-month guarantee on every job
- Full insurance on every job
- Arbo and Everbuild products
See our cost guide and what customers say.