Kent · England
Waltham Window Mastic
Mastic around window and door frames, sills and patio doors for Waltham, backed by a one-year guarantee. Ask us for a quote.
- Rain getting in at the frame or under the sill
- Draughty joints inside around the window
- A bead that doesn’t match the frame
About our window mastic in Waltham
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and we give a one-year guarantee on the work. If you are dealing with gaps between the frame and the inside reveal and mastic that’s falling out in pieces, we can help.
Around Waltham, 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.
Your job is guaranteed for a year, as with all our work.
- Location
- Waltham (CT4)
- Region
- Kent
- Cover
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Window sills
Masonry sills can have joints where water gets in, including the one between the sill and the frame above. We seal those with a sealant suited to masonry.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match keeps the clean look.
Work for landlords, hotels and businesses
If you manage several properties in or around Waltham, several properties can go on one quote. Send us the addresses and the work at each.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
What else we do in Waltham
What happens on the day
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the job takes anything from an hour or two to a full day, depending on how many frames there are in most cases. In a small place like Waltham, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
Before we arrive
- Tell us if parking is tricky
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
Why act early in Waltham
Failed mastic isn’t a reason to replace sound windows. Where the frames are sound, new mastic usually deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. Where a wall is exposed, as many are in small places like Waltham, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why book with us
- An ARBOMaster approved applicator
- Every job guaranteed for a year
- More than 20 years in sealant work
- Quality sealants from Arbo and Everbuild
Read our cost guide or customer reviews.
Frames and glazing around Waltham
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Chilham station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Waltham is about 6 miles south-west of Canterbury, in Kent. We carry out window mastic for homes and businesses in Waltham and the surrounding area. Our Kent coverage runs to 922 places, Waltham among them. You can also see our page for Chelmsford, about 44 miles away.
Every address in CT4 is covered for window mastic, from the main roads to the quietest streets. Local streets include Church Lane, Richdore Road and Kake Street, and we cover them all. If you’re just outside Waltham, we cover Stelling Minnis (2 miles east), Bossingham (2 miles east), Stowting Common (4 miles south), Stowting (4 miles south) and Rhodes Minnis (4 miles south-east). Further out, we also cover Ashford (8 miles south-west), Canterbury (6 miles north-east), Dover (13 miles east), Folkestone (10 miles south-east), Whitstable (11 miles north) and Faversham (10 miles north-west).
What’s near Waltham
Typical jobs here are in homes near Compasses Inn, among other places. For rail, the closest station is Chilham station, roughly 3.7 miles north-west of the centre. Nearby you’ll also find Chilham Castle (4.1 miles north-west) and Kent and Canterbury Hospital (5.5 miles north-east).
Honest limits
We’d rather tell you now than do work that will not last, so these are the limits:
- A frame that has rotted at the joint
- Draughts through the window seals rather than the frame
- Faulty window hardware
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Where we work in Waltham
- uPVC windows
- Composite doors
- Aluminium frames
- Window sills
- Timber windows & doors
- Patio & French doors
Should I try it myself first?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Common problems we fix in Waltham
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar never bonded as it should, so it comes away long before its time.
Any of these means the joints need attention:
- Draughty joints inside around the window
- Gaps where the sill meets the wall
- Untidy mastic left by window fitters
- Damp patches on the reveal after heavy rain
If you live in an older home near Church of St Bartholomew, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before you book anyone
- Whether all the old sealant comes out first
- Who does the work, and how experienced they are
- Is VAT in the price?
- Whether the sealant suits the joint
FAQs for Waltham
I let a flat near Chilham station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Can you do window mastic in Waltham?
Yes. We work across London and the South East, and Waltham is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Is the work guaranteed?
Yes, with our one-year guarantee. Keeping drainage clear and checking the joints yearly helps them last.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we are fully insured too.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.