West Sussex · England
Window & door mastic in Bosham, West Sussex
Window mastic for Bosham and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Damp patches on the reveal after heavy rain
- Gaps left after new windows were fitted
- Gaps where the sill meets the wall
Window mastic in Bosham
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through. If the draught is through the window seals instead, we’ll tell you. If you have sealant in the wrong colour for the frame and old mastic that has gone black or come away, we can put it right.
Homes in small places like Bosham often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
Big or small, it’s backed by our 12-month guarantee in Bosham and across West Sussex.
- Location
- Bosham (PO18)
- Region
- West Sussex
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Leave it or put it right?
Failed mastic isn’t a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. If we find failed glass units or worn seals, we’ll tell you. Where a wall is exposed, as many are in small places like Bosham, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost depends on the size of the job, how much old material has to come out and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
What you get with us
- Anti-fungal sanitary silicone in wet areas
- Quality sealants from Arbo and Everbuild
- We never seal over old sealant
- Over 20 years’ experience
Towns and villages near Bosham
More services for Bosham
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes a few hours for a few frames, or a day or more for a whole house, depending on the size of the job. For a village or hamlet like Bosham, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Tell us about access, such as stairs, a lift or high-level joints
- Try not to wet indoor joints just before the visit
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Advice
Windows and doors in Bosham
Bosham is close to 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. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Bosham station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. In the older streets around The United Reformed Church, the joint between an old wall and a newer frame is usually the first place rain gets in.
Bosham is about 3 miles west of Chichester, in West Sussex. Jobs in Bosham get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 371 places in West Sussex are on our list. For nearby work, see our Portsmouth page, about 10 miles away.
Postcode districts we cover here for window mastic: PO18. That includes homes and businesses on High Street, Viking Way and Merryweather Road. If you are just outside Bosham, we cover Broadbridge (1 mile north-east), Chidham (1 mile west), Bosham Hoe (1 mile south), Nutbourne (2 miles north-west) and Fishbourne (2 miles east). Within a short drive, we also cover Bognor Regis (8 miles east), Chichester (3 miles east), Selsey (7 miles south-east), Littlehampton (14 miles east), Emsworth (4 miles west) and Rustington (15 miles east).
Local landmarks in Bosham
Locally, jobs take us to homes and businesses close to The Berkeley Arms Public House. The closest station to Bosham is Bosham station, about 0.8 miles north-east of the centre. Nearby you’ll also find Chichester Cathedral Treasury (3.2 miles east) and St Richard's Hospital (3.8 miles east). Green spaces nearby include Nutborne Marshes and Stoke Down.
How the job changes by surface
Composite doors
Composite doors are normally hung in an uPVC-type frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour keeps the clean look.
Aftercare tips
So the new joints stay in good condition:
- Air rooms to keep condensation down around windows
- Keep solvents and bleach off the sealant
- Check the mastic once a year
- Use gentle cleaners on frames and sealant
Most silicone sealants won’t take paint, so if you are planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
Leaks normally show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
What we can’t put right
Sealant isn’t the answer to every problem, and we will tell you before we start. It will not solve:
- Broken hinges, locks or handles
- A failed sealed unit that has misted up
- Rotten timber, which needs a joiner first
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before you book.
Where we work in Bosham
- Window sills
- Composite doors
- uPVC windows
- Aluminium frames
- Patio & French doors
- Timber windows & doors
When to call us in Bosham
Water runs down the glass onto the sill, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
Most people get in touch after spotting something like this:
- White mastic on grey or black frames
- Water coming in at the bottom corners of a door
- Black, perished sealant on frames
- Rushed sealant from a window installation
For site and facilities teams at buildings such as Bosham Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- Is VAT in the price?
- Who does the work, and how experienced they are
- How the joint is cleaned and prepared
- What the cure time is
Common questions in Bosham
Is Bosham within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is window mastic in a coastal place like Bosham any different?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
What does window mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You will get a clear quote before work begins.
Is the new sealant paintable?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme.
Is it worth trying it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
I’m a tenant. Can you help?
We are happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us.
What affects the cost of window mastic
Every job gets its own quote. This is what makes a difference:
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- How many areas need sealing
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. Your quote takes all of that into account.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- Photos by email, if that’s easy
- Any access issues, like height or stairs
- If someone has resealed it before
- The type of property
Need a quote? Please phone 0345 464 0079 or send us an email and tell us about the job. We’ll explain what we’d do and give you a clear quote before any work starts.