West Sussex · England
Crosspost New Build Mastic
New-build sealant joints in Crosspost need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Sealant work across a run of new homes
- Untidy sealant flagged on a snagging list
- Gaps behind new kitchen upstands
New build mastic for homes and businesses in Crosspost
A new build should have a neat, sound bead at every joint. Smeared, patchy or cracked sealant is worth sorting early, before water gets into the floor or walls. Typical jobs include gaps behind new kitchen upstands and cracked sealant around new window and door frames, across show homes, plot handovers and kitchens.
Somewhere as small as Crosspost, new homes tend to be conversions, self-builds or a few houses rather than an estate. Each still needs its sealant and floor joints finished properly.
You get a one-year guarantee, the same in Crosspost as everywhere else we work.
- Place
- Crosspost (RH17)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why act early in Crosspost
It often makes sense to do all the sealant items on a snagging list together. It’s one visit, one quote and one set of cure times to plan around. Where a wall is exposed, as many are in small places like Crosspost, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Why Crosspost customers choose us
- An ARBOMaster approved applicator
- We never seal over old sealant
- We leave the area clean and tidy
- Experience in homes, commercial sites and hotels
See our cost guide or customer reviews.
Looking after it afterwards
To keep the joints looking good and working properly:
- Raise failed sealant with the developer while you are covered
- Use the extractor fan every time you shower
- Keep water off fresh sealant until it has cured
- Avoid scourers and strong chemicals on sealant
Keep an eye on the joints over the first couple of years. Small gaps can appear as the house dries, and they’re simple to reseal once movement has slowed.
Report failed sealant to the builder while you’re in the snagging period. Once it ends, the repair may be down to you.
How we quote for new build mastic
Every job gets its own quote. This is what makes a difference:
- The type of sealant required
- How easy the joints are to reach
- The old material and how stubborn it is
- The size of the job
What you pay reflects the work, not guesswork. That is why we ask a few questions first.
Asking for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- Whether it’s a home or a business
- The rough size of the job
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
For new build mastic in Crosspost, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
What we’re called out for in Crosspost
Sealant is often one of the last jobs before handover. Joints are not always cleaned of dust or primed, so the bead never bonds properly.
The problems people usually mention when they call include:
- Skirting joints opening in the first winter
- Sealant work across a run of new homes
- Messy sealant that spoils new finishes
- Internal frame sealant that has split
If you’ve bought a new home near Wivelsfield station, the sealant around baths, showers and frames is worth checking in the first year or two.
Questions to ask before you book
- When the joint can take water or movement
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
- Whether you can choose the colour
Common questions in Crosspost
Is Crosspost in your area for new build mastic?
Yes, Crosspost is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or email us with a few details of the job.
Do you cover smaller places like Crosspost?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you take on second-fix sealing for builders?
Yes. Second-fix sealing in bathrooms, kitchens, frames and floors is part of what we do. Good preparation keeps snagging to a minimum.
Can I send you my snagging list?
Yes. Send it with pictures and we will quote for the sealant items. If something isn’t sealant, we will say so.
How do I get a quote for new build mastic in Crosspost?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we’ll talk you through it.
Can I add another job to the visit?
Yes. Just list everything you need and we’ll quote it together.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you use white or clear sealant?
White and clear are the most common, but sealant comes in other colours too. We choose one to suit the room before we begin.
New homes and floors in Crosspost
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Crosspost, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Crosspost is about 4 miles north-west of Burgess Hill, in West Sussex. Anywhere in RH17, we cover new build mastic for homes and businesses. Our West Sussex coverage runs to 371 places, Crosspost among them. Crawley is on our list too, about 9 miles from Crosspost.
All of RH17 is within our area for new build mastic, from the main roads to the quietest streets. New build mastic is available to properties on Cowfold Road and Chapel Road and the roads around them. Neighbouring places we cover for new build mastic include Bolney (1 mile north-east), Twineham Green (1 mile south), Twineham (2 miles south), Wineham (2 miles south-west) and Kent Street (2 miles west). Further out, we also cover Crawley (9 miles north), Horsham (7 miles north-west), Worthing (14 miles south-west), Haywards Heath (5 miles east), Burgess Hill (4 miles south-east) and East Grinstead (13 miles north-east).
Around Crosspost
The nearest railway station is Wivelsfield station, about 4.2 miles east of the centre. Well-known places in the area include The Dene Hospital (2.5 miles south-east) and Cuckfield Museum (3.2 miles north-east). The countryside around Crosspost includes Blunts Wood and Paiges Meadow.
Landlords, agents and businesses in Crosspost
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
Places near Crosspost
More services for Crosspost
What we do, step by step
We keep the work tidy and contained to the joints we’re treating. Expect the work to take anything from a few hours to several days, depending on the number of plots, and we explain the cure time before we leave. For a village or hamlet like Crosspost, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each joint is checked for movement before any work starts.
- We remove the failed sealant and clean the joints.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Clear the area around the work
- For business premises, tell us about site rules or sign-in
How to get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or email us.
Advice
How the job changes by surface
Show homes
In a show home, the sealant is on display. Every bead is neat and coloured to suit the room.
Kitchens
As a new house dries, worktops and walls shift a little, opening gaps behind the upstand. A fresh flexible bead closes them.