Kent · England
Window Mastic in Sandwich
Window mastic for Sandwich, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Water coming in at the bottom corners of a door
- Old mastic that has gone black or come away
- Gaps left after new windows were fitted
Window mastic in Sandwich
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. We’re often asked to deal with damp patches on the reveal after heavy rain and cold air getting in at the frame edge, across composite doors, aluminium frames and uPVC windows.
In a smaller place like Sandwich, some walls face open ground and catch the full force of the weather. The mastic around frames on those walls tends to age faster.
The work is covered for a year after we finish. If there’s a problem with it, please ring 0345 464 0079 or drop us an email.
- Where
- Sandwich (CT13)
- Region
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes anything from an hour or two to a full day, depending on how many frames there are, and the area is left clean. For a job in Sandwich, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Before we arrive
- Mention if the joints have been sealed before
- Move anything stored near the joints
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
For a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. You will have a clear quote before any work starts.
Related advice
How the job changes by surface
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. We pay most attention there.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. We prepare and reseal every joint, backing the deep ones.
Places near Sandwich
More services for Sandwich
Window mastic in Sandwich: local notes
Sandwich is within about 3 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. 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.
Letting a property close to Sandwich station? Then renewing tired window mastic between tenants heads off draught and damp complaints. If you look after a building such as Sandwich Infant School, its window and door frames need their mastic kept sound, just like a home’s. If you live in an older home near Sandwich United Reformed Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Sandwich is about 5 miles north-west of Deal, in Kent. Jobs in Sandwich get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 922 towns and villages across Kent, large and small. There’s also a page for Chelmsford, roughly 49 miles from Sandwich.
Postcode districts we cover here for window mastic: CT13. If you need window mastic at a property on Cattle Market, Market Street and High Street or anywhere close by, we can help. We also cover the places around Sandwich: Great Stonar (1 mile north), Felderland (1 mile south), Worth (1 mile south), Woodnesborough (1 mile south-west) and Statenborough (1 mile south-west). Larger places within reach include Canterbury (11 miles west), Margate (8 miles north), Dover (10 miles south), Folkestone (15 miles south-west), Ramsgate (5 miles north-east) and Broadstairs (7 miles north-east).
Local landmarks in Sandwich
Locally, jobs take us to homes and businesses close to Ham Fen, Sir Roger Manwood's School and The Red Cow Public House. Sandwich has its own railway station: Sandwich station. Nearby you will also find The Precinct Toy Collection (within half a mile north) and Ramsgate General Hospital (5 miles north-east). Not far away are Monk's Wall nature reserve.
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What affects the cost of window mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The size of the job
- Whether the work is at height
- Mould in or behind the old joints
- When we can work, for business premises
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all play a part.
Helping us quote
To make quoting easier, please include:
- Where the property is
- Access, such as stairs, a lift or height
- The rough size of the job
- What’s wrong with the joints now
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
FAQs for Sandwich
Do you cover smaller places like Sandwich?
Yes. Sandwich is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you help a landlord with a rental near Sandwich station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear quote.
Do you guarantee window mastic?
Yes. Our one-year guarantee covers every job, inside or out.
Do you remove the old sealant?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
What should I tell you?
A short description and the location. If we need more, we will ask.
Can new sealant go over the old?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Honest limits
Before booking, it’s worth knowing the limits too:
- Worn gaskets, brush seals or a door that has dropped
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp coming through the wall itself rather than the frame joint
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Where we work in Sandwich
- Aluminium frames
- uPVC windows
- Patio & French doors
- Window sills
- Composite doors
- Timber windows & doors
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll quote.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured.
What happens if it’s left?
Failed mastic is not a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that is needed. If we find failed glass units or worn seals, we’ll tell you. In an older home around Sandwich, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
What it costs depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before we start.
Why choose Mr Mastic in Sandwich
- Sealant colour chosen to suit
- An ARBOMaster approved applicator
- We are fully insured
- Any old sealant cut out fully, not covered over
Take a look at how sealant jobs are priced or what customers say.