West Sussex · England
Window & door mastic in West Dean, West Sussex
Mastic around window and door frames, sills and patio doors in West Dean, with a one-year guarantee on every job. Ask us for a quote.
- A bead that does not match the frame
- Water coming in at the bottom corners of a door
- Cracked internal joints between frame and plaster
Window mastic in West Dean, done properly
Homes in West Dean have every kind of window: from uPVC casements to timber and aluminium, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on composite doors, aluminium frames and window sills, and common reasons people get in touch are rain getting in at the frame or under the sill and draughts coming in around windows and doors.
Mastic can only go onto a dry, clean joint, so window work in West Dean is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
All our work comes with our 12-month guarantee, wherever you are in West Sussex.
- Location
- West Dean (PO18)
- Region
- West Sussex
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Honest limits
It helps to know what we can’t do:
- A door that needs adjusting, rehanging or new seals
- Damp problems in the wall away from the window
- Condensation trapped between the panes
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Timber windows & doors
- Window sills
- Patio & French doors
- Aluminium frames
- Composite doors
- uPVC windows
What window mastic looks like in West Dean
With historic houses such as West Dean House (about 0.1 miles north-east) nearby, there’s older building stock in the area around West Dean as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Homes close to The Parish Church of St Andrew include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in. Schools such as West Dean CofE Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
West Dean is about 4 miles north of Chichester, in West Sussex. Homes, rented property, offices and hotels in West Dean is covered for window mastic. Every job comes with our 12-month guarantee. West Dean is one of 371 places in West Sussex where we work for window mastic. Our Portsmouth page covers work nearby (15 miles or so).
Work in PO18 works the same way as everywhere else we cover. Neighbouring places we cover for window mastic include Singleton (1 mile east), Charlton (2 miles east), East Dean (3 miles east), Cocking (3 miles north) and Bepton (4 miles north). Within a short drive, we also cover Bognor Regis (9 miles south-east), Chichester (4 miles south), Selsey (12 miles south), Littlehampton (13 miles south-east), Emsworth (8 miles south-west) and Rustington (13 miles south-east).
Around West Dean
For rail, the closest station is Fishbourne station, roughly 4.8 miles south of the centre. A little further out are Chichester Castle (4.5 miles south) and Museum of Gardening (less than half a mile north-east). Green spaces nearby include Levin Down and Kingley Vale National Nature Reserve.
West Dean: your questions answered
Do you cover smaller places like West Dean?
Yes. West Dean is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Fishbourne station?
Yes. We work for landlords and letting agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or email us.
Can you reach windows above the ground floor?
Yes, in most cases. We plan safe access before the job.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all.
Can new window sealant be painted?
That depends on the product. Some hybrid sealants can be painted; silicone can’t. Tell us if you are decorating and we will choose accordingly.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Signs you need window mastic in West Dean
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.
It’s worth asking for a quote if you see:
- Old mastic that has gone black or come away
- Damp patches on the reveal after heavy rain
- Hard, cracked sealant around windows
- Draughts coming in around windows and doors
If you let a flat or house near Fishbourne station, renewing tired window mastic between tenants heads off draught and damp complaints.
What to look for in a quote
- What happens if they find a problem under the old sealant
- Whether they’re fully insured
- What guarantee comes with the work
- How the joint is cleaned and prepared
For landlords and businesses
Housing providers, facilities teams and property managers book us too in West Dean and across West Sussex. We can quote a run of properties together, and we’re fully insured.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
What we do, step by step
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before we start. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. For a village or hamlet like West Dean, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Let us know about parking restrictions
- Let us know if you’ve seen damp or leaks
Get 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 get started, ring 0345 464 0079 or send us an email.
Related advice
What else we do in West Dean
How the job changes by surface
Patio & French doors
Heavy door frames can move more than windows. A flexible sealant copes with that, where a rigid one would crack.
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
What happens if it’s left?
Not every sealant suits a window. Interior caulk and bathroom silicone are not made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. Where a wall is exposed, as many are in small places like West Dean, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in West Dean
- Neat joints and a tidy finish
- A sealant colour to suit the surroundings
- White, clear, grey or coloured to suit, where the product allows
- 20+ years of sealant experience
Read our cost guide and customer reviews.