West Sussex · England
New-build mastic & snagging in Merston, West Sussex
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Merston. Fully insured, ARBOMaster approved and guaranteed for a year.
- Untidy sealant flagged on a snagging list
- Sealant that never bonded to the surface
- Shower seals failing in the first year or two
DIY sealant or a professional job?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
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.
New build mastic for homes and businesses in Merston
New homes move as they dry out. Timber shrinks, plaster dries and baths and trays bed down, so sealant that was laid quickly before handover often cracks. Typical jobs include new-build shower sealant that has already split and cracked sealant around new window and door frames, across windows & doors, show homes and plot handovers.
Around Merston, older homes often have timber floors that move through the year, so skirting and threshold joints need a flexible sealant rather than a rigid filler.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Merston (PO20)
- Region
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Also near Merston
Other services in Merston
Common questions in Merston
Do you cover smaller places like Merston?
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.
Do you work for landlords with property near Chichester station?
Yes. We work for letting agents and landlords as well as householders. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Will you just run a new bead over the existing one?
No. Over-sealing traps mould and water and soon fails. We remove every bit of the old bead before resealing.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Do you have insurance?
Yes, we’re fully insured.
Can you work from my snagging list?
Yes. Send it with photos and we’ll quote for the sealant items. Items that need a plumber, tiler or the builder are flagged.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Signs you need new build mastic in Merston
Later trades and the final clean can damage fresh sealant. A bead disturbed before it has cured may never seal properly, and the problem shows up after you move in.
Most people get in touch when they notice something like this:
- Messy sealant that spoils new finishes
- Frame joints opening as the plaster dries
- Worktop and upstand sealant coming away
- Joints pulling apart as timber shrinks
If you’ve bought a new home near Chichester station, the sealant around baths, showers and frames is worth checking in the first year or two.
What to look for in a quote
- What preparation is included
- What the cure time is
- Whether all the old sealant comes out first
- What insurance they hold
What new build mastic looks like in Merston
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Merston, as everywhere, new build mastic is only as good as the preparation behind it.
Merston is about 3 miles south-east of Chichester, in West Sussex. Wherever you are in the PO20 postcode area, we cover new build mastic for homes and businesses. Merston is one of 371 places in West Sussex where we work. For nearby work, see our Portsmouth page, about 15 miles away.
We cover every part of PO20 for new build mastic. Nearby, we also carry out new build mastic in Runcton (1 mile south-west), Colworth (1 mile east), Oving (1 mile north), North Mundham (1 mile west) and Lagness (1 mile south). Further out, we also cover Worthing (15 miles east), Bognor Regis (3 miles south-east), Chichester (3 miles north-west), Selsey (6 miles south), Littlehampton (9 miles east) and Emsworth (9 miles west).
Near you in Merston
We work in homes and buildings around Chichester High School For Girls. The closest station to Merston is Chichester station, about 2.3 miles west of the centre. A little further out are The Chichester City Museum (2.3 miles north-west) and St Richard's Hospital (2.3 miles north-west).
What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes anything from a few hours to several days, depending on the number of plots. For a village or hamlet like Merston, 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.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- Every bit of the old builder’s sealant is cut out, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
- Move anything stored near the joints
Getting a quote
Getting a quote is simple: let us know the job and the location, and roughly how big it is. A few photos by email make the job easier to understand, and we’ll take it from there.
Advice
Surface by surface
Plot handovers
Developers can send the plot schedule and specification. We seal bathrooms, kitchens, frames and floors.
Kitchens
Worktop, upstand and sink joints in new kitchens often get a hurried bead. We take it out and reseal neatly, colour-matched where it shows.
How we quote for new build mastic
Every job gets its own quote. These are the things that affect it:
- Mould in or behind the old joints
- The number and length of the joints
- Any working-time requirements on site
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What we need to know
Before you ask for a quote, have a think about:
- Any access issues, like height or stairs
- The problem you’ve noticed
- Photos by email, if that’s easy
- Whether it’s a home or a business
Every job is quoted individually, so the first step is telling us about yours. Simply call 0345 464 0079 or drop us an email and describe the job and send pictures if you have them.
Aftercare tips
To keep the joints looking good and working properly:
- Ventilate bathrooms well, especially in the first year
- Follow the cure time we give you
- Act quickly if a seal starts to leak
- Check bath and shower seals every few months as the house settles
Avoid standing on the rim of the bath or the edge of the tray in the first few weeks. Report any movement in a bath or tray.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Early resealing keeps the job small.
Leave it or put it right?
For developers, getting the sealant right first time saves return visits. Every return visit for a failed seal takes time and most come down to preparation. In a small place like Merston, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Why us?
- Approved under the ARBOMaster scheme
- Homes, businesses and hotels
- Trusted Arbo and Everbuild sealants
- Every job guaranteed for a year
Take a look at what affects the cost or what customers say.