Kent · England
Window & door mastic in Offham, Kent
Mastic around window and door frames, sills and patio doors for homes and businesses in Offham and across Kent. Fully insured, ARBOMaster approved and guaranteed for a year.
- Gaps between the frame and the inside reveal
- Gaps where the sill meets the wall
- Sealant in the wrong colour for the frame
Windows and doors in Offham
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Old Soar Manor (about 3.1 miles south-west) are a reminder that the area around Offham has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For site and facilities teams at buildings such as Offham Primary School, the mastic around its windows and doors needs looking after like any other building’s. Rented homes near West Malling 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.
Offham is about 7 miles west of Maidstone, in Kent. Every kind of property in Offham can book us for window mastic. The work is guaranteed for a year. Our Kent coverage runs to 922 places, and Offham is one of them. London is on our list too, about 25 miles from Offham.
All of ME19 is within our area for window mastic. Streets in the area include Church Road, Pepingstraw Close and Teston Road. Other places close to Offham include Wrotham Heath (1 mile west), Comp (2 miles west), Kent Street (2 miles south), New Pound (2 miles south) and Herne Pound (2 miles south). Larger places within reach include Maidstone (7 miles east), Dartford (12 miles north-west), Sevenoaks (8 miles west), Royal Tunbridge Wells (12 miles south-west), Gravesend (10 miles north) and Tonbridge (8 miles south-west).
What’s near Offham
In Offham, that means homes and buildings near King's Arms Public House and Manor Park Country Park. For rail, the closest station is West Malling station, about 1.9 miles east of the centre. A little further out are Leybourne Castle (2.2 miles north-east) and Maidstone Hospital (4.8 miles east).
About our window mastic in Offham
Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on timber windows & doors, composite doors and patio & French doors, and people most often call us about gaps between the frame and the inside reveal and gaps where the sill meets the wall.
Somewhere as small as Offham, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
Whatever the size of the job, you get the same 12-month guarantee in Offham and across Kent.
- Where
- Offham (ME19)
- Region
- Kent
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY sealant or a professional job?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the 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 does not work out, we can still put it right.
Different surfaces, different methods
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. Each is cleaned out and resealed.
Patio & French doors
Patio and French doors have the longest joints on most houses. Most leaks start at the bottom corners, so we pay close attention there.
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Clear any debris from frame drain holes
- Look round the frames every year or so
- Do not paint over the silicone
- Ventilate rooms so frames don’t stay wet inside
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. Resealing closes it.
When to call us in Offham
Mastic ages in the weather. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
Signs it’s time to call us include:
- Cold air getting in at the frame edge
- Draughty joints inside around the window
- Damp patches on the reveal after heavy rain
- Hard, cracked sealant around windows
In the older streets around Church of St Michael, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- The length of the guarantee
- What preparation is included
- Who turns up on the day
- What product goes in the joint
What affects the cost of window mastic
Jobs vary more than people expect. What affects the quote:
- Any mould that needs treating
- The amount of work
- Which sealant suits the joint
- How easy the joints are to reach
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
What to tell us for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The type of property
- Where the job is, and your postcode
- Pictures of the joints, sent by email
- What the problem is, such as mould, gaps, leaks or cracking
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Why act early in Offham
Resealing frames is a short job: the visit takes a few hours for a handful of frames, longer for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. Where a wall is exposed, as many are in small places like Offham, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Why choose Mr Mastic in Offham
- Sanitary silicone with an anti-fungal additive in wet areas
- We never seal over old sealant
- Experience in homes, commercial sites and hotels
- A 12-month guarantee on all work
Take a look at what affects the cost or our reviews.
Nearby places to Offham
Other services in Offham
Questions from Offham
Do you work for landlords with property near West Malling station?
Yes. We work for letting agents and landlords as well as householders, and several properties can be quoted together. You can call 0345 464 0079 or email us with the details for a clear quote.
Do you cover Offham for window mastic?
Yes. We work across London and the South East, and Offham is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Is there any odour?
There can be a smell while the sealant cures, but it fades. Ventilation helps.
What should I tell you?
Just the basics: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or drop us an email.
How many windows can you do in a day?
It depends on access, the old mastic and the size of the frames. We’ll tell you how long your job needs when we quote.
Will new mastic stop draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
How it works
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. The job usually takes a few hours for a handful of frames, longer for a whole house, and we tell you how long to leave it before we go. Somewhere as small as Offham, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Getting ready for the visit
- Tell us if parking is tricky
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any water getting in
Getting a quote
Every job is quoted individually. Simply phone 0345 464 0079 or drop us an email and describe the job.