West Sussex · England
External & façade joints in Bosham, West Sussex
External mastic in Bosham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Failed seals between different materials
- Movement joints filled with mortar instead of sealant
- Plants rooting in failed movement joints
External mastic in Bosham
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. We work on joints between brick and frames, render & cladding joints and copings & trims, and people most often call us about rigid filler in a joint that should flex and panel joints letting water in.
Outside joints can only be sealed when they’re dry, so work in Bosham is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
There’s a 12-month guarantee on every job.
- Place
- Bosham (PO18)
- Wider area
- West Sussex
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. Older cottages and farmhouses around Bosham can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
Why book with us
- Experience in homes, commercial sites and hotels
- We leave the area clean and tidy
- Colour picked to suit the job
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide or our reviews.
Bosham: your questions answered
Do you work for landlords with property near Bosham station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Is external mastic in a coastal place like Bosham any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Is there a guarantee?
Yes. Each job is guaranteed for twelve months.
Why do you put foam in the joint first?
Backing rod goes into deeper joints as a matter of course. It controls the depth and stops the sealant bonding to the back so the bead can stretch.
Are you fully insured?
Yes. We are fully insured for every job we do.
How much does external mastic cost in Bosham?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or send us an email with a short description of the job.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Clear growth from the base of walls and joints
- Tell anyone working on the walls about the movement joints
- Get split or bare joints resealed while the damage is small
- Keep water from gutters off the wall
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
How the job changes by surface
Copings and trims
Copings expand and contract through the day, so the joints need a sealant that stays flexible in all weathers.
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. The movement joint takes that up, so its sealant has to stay flexible.
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured for the work.
Places near Bosham
More services for Bosham
Honest limits
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Render that’s blown, hollow or coming away
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Walls that need new movement joints cut into them
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
Surfaces we seal
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Concrete & block
- Façade panels
What we do, step by step
We keep the work tidy and contained to the area we are working on, so you can carry on as normal. The job normally takes a few hours for a handful of joints, longer for a whole elevation. For a village or hamlet like Bosham, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Keep children and pets away from the work area
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
How to get a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved.
Read more
External mastic in Bosham: local notes
Bosham is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on movement joints and outside wall joints, especially on the side facing the sea. With historic houses such as Warblington Castle (about 4.9 miles west) nearby, there’s older building stock in the area around Bosham as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Letting a property close to Bosham station? Then outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as The United Reformed Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
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. We cover 371 towns and villages across West Sussex. Our Portsmouth page covers work nearby.
Every address in PO18 is covered for external mastic, from the main roads to the quietest streets. Whether your property is on High Street, Viking Way and Merryweather Road or a nearby road, our applicators can take on the job. Close by, we work in Broadbridge (1 mile north-east), Chidham (1 mile west), Bosham Hoe (1 mile south), Nutbourne (2 miles north-west) and Fishbourne (2 miles east). Larger places within reach include 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
In Bosham, that means homes and buildings near The Berkeley Arms Public House. For rail, the closest station is Bosham station, about 0.8 miles north-east of the centre. Other landmarks nearby include Chichester Cathedral Treasury (3.2 miles east) and St Richard's Hospital (3.8 miles east). For a walk, there’s Nutborne Marshes and Stoke Down.
What we’re called out for in Bosham
UV, rain and frost all age exterior sealant. Over the years it hardens, cracks on the surface and loses its give, so the next time the wall moves, it splits or pulls away.
The most common problems we see are:
- Water getting into walls through failed joints
- Movement joints with cracked, split or missing sealant
- Joints where the bead has come unstuck
- Gaps where render, brick and frames meet
If you look after a building such as Bosham Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before you book
- Whether you can choose the colour
- The length of the guarantee
- What insurance they hold
- How the joint is cleaned and prepared