Kent · England
Window & door mastic in Northbourne, Kent
Our applicators work in Northbourne on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Draughts coming in around windows and doors
- Rain getting in at the frame or under the sill
- Hard, cracked sealant around windows
Why deal with it now?
Choosing the product is half the job. Interior caulk and bathroom silicone aren’t made for exterior frame joints. A low-modulus exterior sealant keeps its stretch through hot and cold weather. Around Northbourne, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why Northbourne customers choose us
- Any old sealant cut out fully, not covered over
- Arbo and Everbuild products
- Sealant colour chosen to suit
- ARBOMaster approved applicator
See our cost guide or customer reviews.
Window mastic in Northbourne, done properly
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. Common call-outs are for a bead that doesn’t match the frame and cracked sealant at the sill ends, on composite doors, patio & French doors and window sills.
Somewhere as small as Northbourne, 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.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Northbourne (CT14)
- Region
- Kent
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Also near Northbourne
Also in Northbourne
What affects the quote in Northbourne
Call for a quick quote. The main things that affect it are:
- How many areas need sealing
- Any mould that needs treating
- Working hours on commercial sites
- How much there is to do
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- Any access issues, like height or stairs
- Where the property is
- Photos by email, if that is easy
- The problem you’ve noticed
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
Northbourne: your questions answered
Is Northbourne in your area for window mastic?
Yes. Our work covers London and the South East, and Northbourne is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing.
Will you come out to Northbourne?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you do upstairs windows?
Yes, where they can be reached safely. Let us know about access when you ask for a quote so we can plan the job.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before resealing.
How much does window mastic cost in Northbourne?
Size, access and the old material all affect the cost. Ask us for a quote.
Can you do the inside joint as well?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly.
Where do you work from?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
How the job changes by surface
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. We seal onto sound, dry paintwork or timber.
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Wash the frames with mild soapy water
- Keep solvents and bleach off the sealant
- Keep paint off silicone joints
- Make sure the drainage slots are not blocked
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.
How it works
We bring everything the job needs with us, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes a few hours for a handful of frames, longer for a whole house. Somewhere as small as Northbourne, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- 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.
- We clear up and check every joint is fully closed.
How to prepare
- Clear items away from the joints we’re working on
- Plan for the work area to be out of bounds to pets and children
- Mention any parking rules near the property
How to get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or email us.
Advice
Signs you need window mastic in Northbourne
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
Most people get in touch when they notice something like this:
- Gaps between the frame and the inside reveal
- A bead that doesn’t match the frame
- Black, perished sealant on frames
- Untidy mastic left by window fitters
Homes close to Church of St Augustine include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What your quote should include
- Whether they’re fully insured
- Whether VAT is included
- Which colour the sealant will be
- How hidden problems are handled
Northbourne homes and the weather
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. With historic houses such as Walmer Castle (about 3 miles south-east) nearby, there’s older building stock in the area around Northbourne as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For landlords with property near Walmer station, renewing tired window mastic between tenants heads off draught and damp complaints. Schools such as Northbourne Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Northbourne is about 2 miles west of Deal, in Kent. Anywhere in CT14, we cover window mastic for homes and businesses. Northbourne is one of 922 towns and villages in Kent where we work for window mastic. There’s also a page for Chelmsford, about 51 miles away.
Postcode districts we cover here for window mastic: CT14. Whether your property is on Deal Road, Coulson Grove and Mill Lane or a nearby road, our applicators can take on the job. Other places close to Northbourne include Marley (1 mile north), Great Mongeham (1 mile south-east), Finglesham (1 mile north), Sholden Meadows (1 mile east) and Sholden (1 mile east). We also work in nearby towns such as Canterbury (12 miles west), Margate (11 miles north), Dover (6 miles south), Folkestone (12 miles south-west), Ramsgate (9 miles north) and Broadstairs (11 miles north).
Near you in Northbourne
Typical jobs here are in homes near Castle Community College, Hare & Hounds pub and Betteshanger Park, among other places. For rail, the closest station is Walmer station, about 2.2 miles south-east. Other landmarks nearby include Deal Castle (2.8 miles east) and Kent Museum of the Moving Image (2.7 miles east). For a walk, there’s Monk's Wall nature reserve.
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Damp coming through the wall itself rather than the frame joint
- A door that needs adjusting, rehanging or new seals
- Condensation trapped between the panes
If you’re not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- uPVC windows
- Timber windows & doors
- Patio & French doors
- Window sills
- Aluminium frames
- Composite doors