Kent · England
Window Mastic in Sibertswold
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Sibertswold. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Cracked internal joints between frame and plaster
- Cold air getting in at the frame edge
- Mastic that has split away from the wall
Aftercare tips
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Make sure the drainage slots are not blocked
- Look round the frames every year or so
- Air rooms to keep condensation down around windows
- Don’t use solvent cleaners on the joint
Have a look at the joints once a year, ideally after winter. Small splits are simple to catch before they leak.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
Window mastic for homes and businesses in Sibertswold
Behind a thin line of old mastic there’s sometimes a deep void. Packing it solid with sealant gives a joint that can’t flex, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. Common call-outs are for mastic that has split away from the wall and rushed sealant from a window installation, across uPVC windows, timber windows & doors and aluminium frames.
In a village or hamlet like Sibertswold, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
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.
- Location
- Sibertswold (CT15)
- Wider area
- Kent
- Cover
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
The process
When we get to you, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for a handful of frames, longer for a whole house. Somewhere like Sibertswold needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Clear items away from the joints we’re working on
- Tell us if parking is tricky
- Mention if the joints have been sealed before
Ask for a quote
We do not publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Advice
How the job changes 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.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. Each is cleaned, backed where deep and resealed.
When something else is needed
We will not take on work that will not last, so these are the limits:
- A frame that has rotted at the joint
- Condensation trapped between the panes
- Worn gaskets, brush seals or a door that has dropped
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.
Where we work in Sibertswold
- Timber windows & doors
- Composite doors
- uPVC windows
- Patio & French doors
- Aluminium frames
- Window sills
Sibertswold: your questions answered
Is Sibertswold in your area for window mastic?
Yes, Sibertswold is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
Is Sibertswold within the area you cover?
Yes. Sibertswold is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
How much does window mastic cost in Sibertswold?
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.
Is the work guaranteed?
Yes. Each job is covered for 12 months.
Can you do several jobs on one visit?
Yes, we can. More than one area can go on one quote.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint.
Can you seal over the old sealant?
No. We remove every bit of old sealant first, so the new sealant bonds properly.
Can you seal the gap between the frame and the plaster indoors?
Yes. Draughts often come through the inside gap too, so it can be worth sealing both.
Frames and glazing around Sibertswold
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Goodnestone Park (about 3.9 miles north) are a reminder that the area around Sibertswold has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Homes close to Church of St Andrew include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
Sibertswold (also: Shepherdswell) is about 4 miles north-west of Dover, in Kent. Jobs in Sibertswold get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Sibertswold is one of 922 towns and villages in Kent where we work for window mastic. For nearby work, see our Chelmsford page (50 miles or so).
All of CT15 is within our area for window mastic. If you need window mastic at a property on Station Road, Hill Avenue and Eythorne Road or anywhere close by, our applicators can take on the job. If you’re just outside Sibertswold, we cover Halfway Street (1 mile south-west), Coldred (1 mile south-east), Waldershare (1 mile east), Eythorne (2 miles north-east) and Lydden (2 miles south). Larger places within reach include Canterbury (9 miles north-west), Margate (15 miles north-east), Dover (4 miles south-east), Folkestone (8 miles south), Ramsgate (13 miles north-east) and Broadstairs (15 miles north-east).
What’s near Sibertswold
Around Sibertswold, our work takes us to homes and buildings near The Bricklayers' Arms, among other places. Sibertswold has its own railway station: Shepherds Well station. Nearby you will also find Dover Transport Museum (3.6 miles south-east) and Buckland Hospital (4.6 miles south-east).
Also near Sibertswold
More services for Sibertswold
Landlord and commercial work in Sibertswold
Letting agents and landlords in Sibertswold can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
For anyone letting property in or around Sibertswold, several properties can go on one quote. Send us the addresses and the work at each.
What we are called out for in Sibertswold
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, while a joint packed solid can’t stretch. That’s what backing rod is for.
Keep an eye out for these signs:
- Gaps where the sill meets the wall
- Whistling draughts around closed windows
- Old mastic that has gone black or come away
- Untidy mastic left by window fitters
Rented homes near Shepherds Well station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Comparing quotes
- Is the old sealant removed completely?
- Whether they’re fully insured
- How the joint is cleaned and prepared
- Whether you can choose the colour
What happens if it’s left?
Draughts and leaks don’t always mean new windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. In a small place like Sibertswold, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Doing several joints on 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 us?
- Old sealant always removed completely
- A 12-month guarantee on all work
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
Read what affects the cost or our reviews.