West Sussex · England
New Build Mastic in Coolham
Plot mastic for developers and snagging failed sealant in new homes for homeowners, landlords and businesses in Coolham. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- New-build shower sealant that has already split
- Sealant work across a run of new homes
- Skirting joints opening in the first winter
What happens if it’s left?
A tube of sealant from the DIY shop won’t fix the cause: grit, unprimed surfaces and old layers underneath. Proper removal and preparation are what make it last. Older cottages and farmhouses around Coolham can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on how much there is to do, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Why book with us
- 4.9 on Google from 180+ five-star reviews
- Quality sealants from Arbo and Everbuild
- Approved under the ARBOMaster scheme
- Anti-fungal sanitary silicone in wet areas
See our cost guide or what customers say.
New build mastic in Coolham, done properly
Dust is the enemy of new-build sealant. Each joint is cleaned of dust and primed where the product calls for it, so the new bead bonds properly. We’re often asked to deal with sealant applied over dusty or wet surfaces and cracked sealant around new window and door frames, across plot handovers, windows & doors and bathrooms & en suites.
Work in a small place like Coolham just needs the journey and access planning, and once on site, the job is the same as anywhere.
You get a one-year guarantee, the same in Coolham as everywhere else we work.
- Where
- Coolham (RH13)
- Region
- West Sussex
- Cover
- 12 months on all our work
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Act quickly if a seal starts to leak
- Keep water off fresh sealant until it has cured
- Avoid running a DIY bead over the old one
- Watch for new gaps as the house dries out
Watch the joints as the house settles. Hairline gaps can open as timber and plaster dry and can be resealed later.
Early snagging is easier snagging. Left alone, a small crack can become a leak.
New build mastic around Coolham
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.
In and around Coolham, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Coolham is about 6 miles south-west of Horsham, in West Sussex. From the centre of Coolham to the outskirts, new build mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across West Sussex, we cover 371 places, and Coolham is one of them. There’s also a page for Crawley, roughly 12 miles from Coolham.
Postcode districts we cover here for new build mastic: RH13. Whether your property is on Coolham Road and West Chiltington Lane or a nearby road, our applicators can take on the job. If you are just outside Coolham, we cover Goose Green (3 miles south), Gay Street (3 miles south-west), Adversane (3 miles west), North Heath (3 miles west) and West Chiltington (3 miles south-west). Within a short drive, we also cover Crawley (12 miles north-east), Horsham (6 miles north-east), Worthing (12 miles south), Haywards Heath (13 miles east), Burgess Hill (12 miles east) and Littlehampton (14 miles south-west).
What’s near Coolham
We work in homes and buildings around The Selsey Arms Public House, among other places. The nearest railway station is Billingshurst station, about 2.4 miles north-west. Nearby you will also find Christs Hospital School Museum (3.9 miles north-east). For a walk, there’s Knepp Wildland.
Quotes for new build mastic in Coolham
Some jobs are bigger than they look, and some smaller. The main factors:
- The old material and how stubborn it is
- Whether the work is at height
- How many areas need sealing
- The type of sealant required
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll explain what it covers.
What to tell us for a quote
There’s no need for technical detail. Just tell us:
- Roughly how big the job is
- If it’s domestic, commercial or a hotel
- Where the job is, and your postcode
- Any access issues, like height or stairs
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved and send you a clear quote.
Places near Coolham
What else we do in Coolham
Do you need new build mastic in Coolham?
When the heating goes on in the first winter, the house dries fast. Skirting, frames and worktops pull away slightly.
People normally contact us after spotting something like this:
- Messy sealant that spoils new finishes
- Leaking shower tray seals in a new home
- Cracked sealant around new window and door frames
- Gaps behind new kitchen upstands
If you’ve bought a new home near Billingshurst station, the sealant around baths, showers and frames is worth checking in the first year or two.
What to look for in a quote
- How long the guarantee is
- Whether they seal over old material or remove it
- What the cure time is
- What the quote includes, VAT included or not
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Structural cracks in walls or ceilings
- Broken tiles or a split tray
- Deciding who is responsible under a builder’s warranty
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly.
What we seal
- Show homes
- Plot handovers
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
- Kitchens
Coolham questions
Do you cover Coolham for new build mastic?
Yes, Coolham is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Do you work for landlords with property near Billingshurst station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Should I go to my builder first?
If you’re still within the builder’s snagging or warranty period, report it to them first. If it isn’t sorted, or keeps failing, get in touch with us.
Can you work from my snagging list?
Yes. Send us the sealant items on the list, with photos if you can, and we will quote. We’ll flag anything that needs another trade.
Is it normal for sealant to crack in a new home?
It’s common, and there are normally two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
Can new sealant go on top of the old bead?
No. Sealing over old sealant looks fine for a few weeks, then lifts. All the old sealant comes out before work begins.
Should I wait before resealing?
If the seal has failed and water is getting in, do it now. Small gaps that are just cosmetic can be resealed once movement has slowed.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
How it works
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a few hours for most snagging lists, longer for a run of plots. In a small place like Coolham, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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 down to clean surfaces.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
How to get a quote
Want a quote for new build mastic? Please phone 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.