West Sussex · England
External Mastic in Boxgrove
Movement joints in Boxgrove need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Sealant pulling away from one side of the joint
- Cracked joints where brick meets render or frames
- Moss and dirt in joints with no sealant left
External mastic in Boxgrove
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. The colour is chosen to suit the brick or render so the joint doesn’t stand out. Common call-outs are for plants rooting in failed movement joints and panel joints letting water in, across joints between brick and frames, brickwork movement joints and copings & trims.
Somewhere as small as Boxgrove, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
All our work comes with our 12-month guarantee, wherever you are in West Sussex.
- Place
- Boxgrove (PO18)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When something else is needed
Sealant is not the answer to every problem, and we’ll tell you before any work starts. Sealant won’t put right:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracking across the wall rather than at a joint
- Structural movement, which needs a surveyor or engineer
If you’re not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Boxgrove
- Render & cladding joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Copings & trims
- Brickwork movement joints
Towns and villages near Boxgrove
Other services in Boxgrove
Common questions in Boxgrove
I let a flat near Chichester station. Can you help?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
Do you cover Boxgrove for external mastic?
Yes. Our work covers London and the South East, and Boxgrove is part of that. You can ring 0345 464 0079 or email us and tell us what needs doing.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme.
Can a movement joint be filled with mortar?
No. Rigid materials can’t move with the wall, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
How much does external mastic cost in Boxgrove?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or email us and tell us what needs doing and where.
How long does external mastic take?
It depends on the size of the job, but as a guide it takes anything from a few hours to several days, depending on the building. We will tell you when we quote.
Does someone need to be in?
It depends on the job. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
For landlords and businesses
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
When to call us in Boxgrove
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it can’t stretch and tears as soon as the joint widens.
The most common problems we see are:
- Hard, crazed mastic that has stopped moving
- Sealant that has lost its bond to the brick or render
- Leaking joints around cladding and façade panels
- Damp patches traced to an open external joint
Homes close to The Priory Church of St Mary and St Blaize include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain.
Before you book anyone
- How the joint is cleaned and prepared
- Are they insured?
- Who does the work, and how experienced they are
- What the cure time is
Why act early in Boxgrove
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and doesn’t last, so it pays to do it properly once. In a small place like Boxgrove, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
Why choose Mr Mastic in Boxgrove
- An ARBOMaster approved applicator
- Trusted Arbo and Everbuild sealants
- Any old sealant cut out fully, not covered over
- A sealant colour to suit the surroundings
Read what affects the cost or our reviews.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
What affects the cost of external mastic
You will get a clear quote before any work starts. It’s based on:
- The amount of work
- Whether the work is at height
- When we can work, for business premises
- How many areas need sealing
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
What we need to know
Before you ask for a quote, have a think about:
- If it’s domestic, commercial or a hotel
- A few pictures by email, if you can
- Any access issues, like height or stairs
- The rough size of the job
Asking for a quote is easy: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand.
How the visit works
You do not need to clear the whole room or building, only the area right around the joints. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. Somewhere like Boxgrove needs a little journey planning: 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 start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
- Mention if the joints have been sealed before
Get a quote
Want a quote for external mastic? Please call 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and send you a clear quote before we start.
Advice
Boxgrove buildings and the weather
Historic houses like Goodwood House (about 1.5 miles north-west) are a reminder that the area around Boxgrove has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. 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.
Schools such as Boxgrove CofE Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing. Rented homes near Chichester station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Boxgrove is about 3 miles north-east of Chichester, in West Sussex. Across the PO18 area, our applicators can take on external mastic. 371 places in West Sussex are on our list, large and small. For nearby work, see our Portsmouth page (16 miles or so).
We cover every part of PO18 for external mastic. Local streets include The Street, Priory Close and Kirkby Close. Other places close to Boxgrove include Halnaker (1 mile north), Tangmere (1 mile south), Strettington (1 mile west), Waterbeach (1 mile north-west) and Westerton (1 mile west). We also work in nearby towns such as Worthing (14 miles east), Bognor Regis (5 miles south), Chichester (3 miles south-west), Selsey (9 miles south), Littlehampton (9 miles east) and Emsworth (10 miles west).
Landmarks near Boxgrove
In Boxgrove, that means homes and buildings near Ormiston Six Villages Academy and The Winterton Arms Public House, among other places. Boxgrove’s nearest station is Chichester station, about 3.5 miles south-west. Other landmarks nearby include Chichester Centre (2.7 miles west) and Tote Copse Castle (1.9 miles south-east). The countryside around Boxgrove includes Levin Down.