Kent · England
Lashenden Window Mastic
Problem with your window and door frames in Lashenden? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Gaps between the frame and the inside reveal
- Water coming in at the bottom corners of a door
- Leaking joints at the ends of sills
Window mastic in Lashenden
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. Typical jobs include water coming in at the bottom corners of a door and white mastic on grey or black frames, on uPVC windows, patio & French doors and composite doors.
In a village or hamlet like Lashenden, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
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.
- Where
- Lashenden (TN27)
- Wider area
- Kent
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Do you need window mastic in Lashenden?
Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. When that sealant fails, water gets into the wall or under the frame.
If you can see any of these, it’s time to have the joints looked at:
- Black, perished sealant on frames
- A bead that doesn’t match the frame
- Gaps where the sill meets the wall
- Cold air getting in at the frame edge
In and around Lashenden, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- What happens if the job turns out different
- Is the old sealant removed completely?
- The length of the guarantee
- What the cure time is
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Wash the frames with mild soapy water
- Clear any debris from frame drain holes
- Walk round the house once a year and look at the joints
- Keep timber frames painted
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early.
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.
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance.
We also work for property managers and facilities teams. We can quote a run of properties together, and we’re fully insured.
Windows and doors in Lashenden
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Headcorn station, renewing tired window mastic between tenants heads off draught and damp complaints.
Lashenden is about 10 miles west of Ashford, in Kent. From the centre of Lashenden to the outskirts, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Our Kent coverage runs to 922 places, Lashenden among them. For nearby work, see our Crawley page (36 miles or so).
Jobs for window mastic in TN27 is quoted and booked the same way as anywhere else. Streets in the area include Bell Lane and Frittenden Road, all of which we cover. We also cover the places around Lashenden: Standen (1 mile south-east), Curteis' Corner (1 mile south), Monk's Hill (1 mile east), Hareplain (2 miles south-west) and Smarden Bell (2 miles north-east). Within a short drive, we also cover Maidstone (10 miles north-west), Ashford (10 miles east), Sittingbourne (15 miles north), Kings Hill (14 miles north-west), Foley Park (11 miles north-west) and Paddock Wood (11 miles west).
Near you in Lashenden
For rail, the closest station is Headcorn station, roughly 1.8 miles north of the centre. Well-known places in the area include Kent Firefighting Museum (1.2 miles west) and Romden Castle (2.9 miles east).
What sealant work cannot fix
Before you book, it’s worth knowing the limits:
- Draughts through the window seals rather than the frame
- Damp problems in the wall away from the window
- Broken hinges, locks or handles
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Joints and surfaces we work on
- Window sills
- Aluminium frames
- Composite doors
- Timber windows & doors
- uPVC windows
- Patio & French doors
Surface by surface
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. We cut it out, back any deep gaps and reseal properly.
Window sills
Where a sill meets brick or render, the ends often crack first. We reseal them so rain cannot run into the wall.
How it works
A visit follows a simple pattern: we look at the joints together, mask and protect the surrounding surfaces, do the work and clear up. It normally takes a few hours for a handful of frames, longer for a whole house. Somewhere like Lashenden needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. 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.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
Ask for a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Related advice
Also near Lashenden
Other services in Lashenden
Lashenden questions
Do you work for landlords with property near Headcorn station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Is Lashenden in your area for window mastic?
Yes, Lashenden is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
Will new mastic stop draughts?
It will if the frame joint is the problem. We find where the air is coming from before we reseal.
Can you do the inside joint as well?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
How much does window mastic cost in Lashenden?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before we start.
Is it messy?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used before we leave.
Can you get sealant to suit coloured frames?
Usually, yes. Mention the frame colour when you ask for a quote and we will use the nearest match.
How we quote for window mastic
We quote each job individually. This is what makes a difference:
- The old material and how stubborn it is
- Whether the work is at height
- How many rooms, windows or areas are involved
- Which sealant suits the joint
A failed joint rarely gets cheaper to fix by waiting. If you are not sure whether it needs doing, ring 0345 464 0079 or email us and we will give you an honest view and a quote.
What to tell us for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
- Where the property is
Want a quote for window mastic? Please call 0345 464 0079 or drop us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.