Kent · England
Window Mastic in Southernden
Problem with your window and door frames in Southernden? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Cracked sealant at the sill ends
- Gaps between the frame and the inside reveal
- Rushed sealant from a window installation
Window mastic in Southernden
There are two joints on most windows. Outside, the mastic keeps rain out; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. If you’re dealing with rain getting in at the frame or under the sill and gaps between the frame and the inside reveal, we can help, whatever the surface.
Around Southernden, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Southernden (TN27)
- Wider area
- Kent
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Places near Southernden
More services for Southernden
When it isn’t the sealant
We’ll always be straight with you, so here’s what sealant can’t fix:
- Worn gaskets, brush seals or a door that has dropped
- Damp coming through the wall itself rather than the frame joint
- Faulty window hardware
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Where we work in Southernden
- Timber windows & doors
- Window sills
- Composite doors
- Patio & French doors
- uPVC windows
- Aluminium frames
How the job changes by surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. Most leaks start at the bottom corners, so they get particular care.
Southernden homes and the weather
With historic houses such as Leeds Castle (about 4.8 miles north) nearby, there’s older building stock in the area around Southernden 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. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Headcorn station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Southernden is about 8 miles south-east of Maidstone, in Kent. From the centre of Southernden to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Southernden is one of 922 towns and villages in Kent we cover. You can also see our page for Crawley, about 37 miles away.
All of TN27 is within our area for window mastic, from the main roads to the quietest streets. If you’re just outside Southernden, we cover Swift's Green (1 mile south), Smarden Bell (2 miles south), Headcorn (2 miles south-west), Hearnden Green (2 miles west) and Biddenden Green (2 miles south-east). Further out, we also cover Maidstone (8 miles north-west), Ashford (9 miles east), Sittingbourne (11 miles north), Faversham (13 miles north-east), Kings Hill (13 miles north-west) and Davington (13 miles north-east).
Around Southernden
Southernden’s nearest station is Headcorn station, about 2.1 miles south-west. Other landmarks nearby include Coldbridge Castle (1.7 miles north-east) and Kent Firefighting Museum (3.8 miles south-west).
What affects the cost of window mastic
Call for a quick quote. What matters most is:
- Which sealant suits the joint
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- Any working-time requirements on site
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and agree the price before starting.
What to tell us for a quote
What to tell us when you ask for a quote:
- What’s wrong with the joints now
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
If you are in Southernden and need window mastic, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
FAQs for Southernden
Is Southernden within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Southernden for window mastic?
Yes. We work across London and the South East, and Southernden is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Can you reach windows above the ground floor?
Generally, yes. We plan safe access before the job.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Will there be a smell?
Some sealants have a smell while they cure. Opening a window helps.
What does window mastic cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s through the window’s own seals or a hinge, that’s a different fix, and we will say so.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
When to call us in Southernden
Older frames were often sealed with products that set hard. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
These are the problems we’re asked about most:
- Draughts coming in around windows and doors
- Gaps left after new windows were fitted
- Leaking joints at the ends of sills
- Cracked internal joints between frame and plaster
Leeds Castle, about 4.8 miles north, is one of the historic houses in the wider area around Southernden.
What to look for in a quote
- What insurance they hold
- Who turns up on the day
- What the cure time is
- Whether all the old sealant comes out first
How the visit works
On the day, we look over the joints with you first. Surfaces next to the work are protected before any work begins. Most jobs take a few hours for a few frames, or a day or more for a whole house. For a village or hamlet like Southernden, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First, we go round the frames with you and agree the list.
- 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.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Mention any leaks or damp you’ve noticed
- Let us know about stairs, lifts or work at height
Getting a quote
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and send you a clear quote before work begins.
Related advice
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Southernden and across Kent. We can quote a run of properties together, and we’re fully insured.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.