Kent · England
Window & door mastic in Cranbrook, Kent
Specialist window mastic for Cranbrook: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Whistling draughts around closed windows
- Water coming in at the bottom corners of a door
- Mastic that has split away from the wall
What we do, step by step
At the end, we look at the finished work together and tell you how long to leave it. The visit itself usually takes a few hours for a handful of frames, longer for a whole house, depending on the amount of work. A visit to Cranbrook is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Preparing for the visit
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any sign-in or site rules at work premises
Getting a quote
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
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How we handle window mastic in Cranbrook
From a single sill to a whole house of windows, the work is priced before anything is done. To get one, phone 0345 464 0079 or send us an email with the number of frames and any access details. We work on window sills, aluminium frames and patio & French doors, and people most often call us about black, perished sealant on frames and water coming in at the bottom corners of a door.
In smaller places like Cranbrook, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. Each frame material needs the right sealant against the right wall.
Whatever the size of the job, you get the same one-year guarantee.
- Where
- Cranbrook (TN17, TN18)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What window mastic looks like in Cranbrook
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to Congregational Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as Cranbrook School, its window and door frames need their mastic kept sound, just like a home’s.
Cranbrook is about 12 miles south of Maidstone, in Kent. Wherever you are in the TN17 postcode area, we cover window mastic for homes and businesses. Across Kent, we cover 922 places, and Cranbrook is one of them. Crawley is on our list too, around 31 miles away.
Here we cover the TN17 and TN18 postcode area for window mastic. You’ll find streets such as High Street, Crane Lane and White Lion Yard. We also cover the places around Cranbrook: Baker's Cross (1 mile east), Coursehorn (1 mile east), Swattenden (1 mile south), Hartley (1 mile south-west) and Gill's Green (3 miles south-west). Larger places within reach include Maidstone (12 miles north), Ashford (15 miles east), Royal Tunbridge Wells (12 miles west), Tonbridge (13 miles north-west), Kings Hill (13 miles north-west) and Foley Park (13 miles north).
Landmarks near Cranbrook
Around Cranbrook, our work takes us to homes and buildings near The Crown Public House, Crane Valley and Cranbrook Church of England Primary School and the streets around them. Nearby you will also find Sissinghurst Castle (2.5 miles north-east) and Benenden Hospital (3.6 miles east).
Can I do it myself?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How to look after the new joints
Simple care keeps the joints in good condition. We recommend:
- Wipe condensation off the frames
- Keep paint and stain on wooden frames in good order
- Paint up to the joint, not over it
- Keep jet washers away from the mastic
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Also near Cranbrook
Other services in Cranbrook
Quotes for window mastic in Cranbrook
The price is agreed before any work begins. It’s based on:
- Whether there’s mould to deal with
- How many areas need sealing
- The old material and how stubborn it is
- The size of the job
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- Whether it has been sealed before
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, phone 0345 464 0079 or drop us an email.
When it is not the sealant
We’d rather tell you now than do work that won’t last, so these are the limits:
- Damp problems in the wall away from the window
- A door that needs adjusting, rehanging or new seals
- A sash or casement that will not close properly
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Patio & French doors
- Window sills
- uPVC windows
- Aluminium frames
- Composite doors
- Timber windows & doors
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Landlords and agents in Cranbrook can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for.
FAQs for Cranbrook
Is Cranbrook in your area for window mastic?
Yes, Cranbrook is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear quote.
Will you come out to Cranbrook?
Yes, Cranbrook is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do the sealants smell?
Possibly a little. It fades as the sealant cures.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint.
Where are you based?
Our base is Crawley. We work across South East England, London and Scotland.
How long will my window job take?
That depends on the number of frames, how they’re reached and the state of the old mastic. You’ll know the timing when we quote.
Are you insured?
Yes, we are fully insured for every job we do.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Why act early in Cranbrook
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished. In an older home around Cranbrook, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
Why Cranbrook clients choose us
- Any old sealant cut out fully, not covered over
- Approved under the ARBOMaster scheme
- 20+ years of sealant experience
- Tidy, careful work
Take a look at what affects the cost and our reviews.