West Sussex · England
Rock New Build Mastic
Problem with your new-build sealant joints in Rock? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Sealant work across a run of new homes
- Cracked caulk along new skirting
- Gaps behind new kitchen upstands
What new build mastic looks like in Rock
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.
Around Rock, as everywhere, new build mastic is only as good as the preparation behind it.
Rock is about 6 miles north of Worthing, in West Sussex. Every kind of property in Rock can book us for new build mastic, old or new, large or small. The work is guaranteed for a year. Our West Sussex coverage runs to 371 places, Rock among them. Brighton is on our list too, about 13 miles from Rock.
Our applicators cover all of RH20 for new build mastic. That includes homes and businesses on Old London Road, London Road and Lamorna Close. Neighbouring places we cover for new build mastic include Washington (1 mile south), Heath Common (1 mile north-west), Sullington (1 mile west), Warminghurst (2 miles north) and Storrington (2 miles west). We also work in nearby towns such as Horsham (11 miles north), Worthing (6 miles south), Bognor Regis (15 miles south-west), Haywards Heath (15 miles north-east), Burgess Hill (12 miles east) and Littlehampton (9 miles south-west).
Around Rock
Locally, jobs take us to homes and businesses close to Rydon Community College and The Frankland Arms Public House. Well-known places in the area include The Storrington And District Museum (1.9 miles west). The countryside around Rock includes Chanctonbury Hill.
How we handle new build mastic in Rock
Our new-build work comes in two parts: plot mastic for developers, and putting right failed sealant for people who’ve bought a new home. In both, preparation makes the difference, because that is what rushed new-build sealant normally lacks. Typical jobs include plot mastic for developers ahead of handover and skirting joints opening in the first winter, across show homes, skirting & floors and plot handovers.
Around Rock, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
Big or small, it’s backed by our one-year guarantee in Rock and across West Sussex.
- Place
- Rock (RH20)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Rock
Other services in Rock
Landlords, agents and businesses in Rock
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
We also work for property managers and facilities teams in Rock and across West Sussex. We can quote a run of properties together, and we are fully insured for the work.
Leave it or put it right?
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 for the lot. Where a wall is exposed, as many are in small places like Rock, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why book with us
- We never seal over old sealant
- Quality sealants from Arbo and Everbuild
- Colour picked to suit the job
- Every job guaranteed for a year
Read what affects the cost and our reviews.
Do you need new build mastic in Rock?
Later trades and the final clean can damage fresh sealant. If it’s disturbed before curing, the joint can be left weak and it shows once the home is in use.
The problems people generally mention when they call include:
- Joints pulling apart as timber shrinks
- Internal frame sealant that has split
- Second-fix sealing on new plots
- Untidy sealant flagged on a snagging list
For jobs in and around Rock, choosing the right material for each joint is as important as a tidy finish.
Comparing quotes
- What product goes in the joint
- Is the old sealant removed completely?
- Is VAT in the price?
- How the colour is chosen
What we do, step by step
You do not need to clear the whole room or building, just the space around the work. We protect the rest, and the job takes a few hours in a single home for a typical job. Somewhere like Rock needs a little journey planning: 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.
- We look at why each joint failed, including any movement.
- 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.
Before we arrive
- Tell us if parking is tricky
- Mention if the joints have been sealed before
- Plan for the work area to be out of bounds to pets and children
Get a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we’ll take it from there.
Related advice
Rock: your questions answered
Do you cover Rock for new build mastic?
Yes. We work across London and the South East, and Rock is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear price.
Do you cover smaller places like Rock?
Yes, Rock is covered. 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.
What sealant do you use?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Can tenants book the work?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
Do you have insurance?
Yes, we are fully insured.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Do you work for developers?
Yes. We seal plots to the developer’s programme ready for handover. Get in touch with the number of plots and the scope and we will quote.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Avoid scourers and strong chemicals on sealant
- Look at the sealant regularly in the first couple of years
- Resist patching a failed seal with a tube from the DIY shop
- Keep pictures and emails about snagging items
Photograph failed sealant before it’s redone and keep the builder’s replies. It’s useful if you need to raise other issues later.
Mould takes hold quickly in sealant that has gaps or lifted edges. Dealing with it before it goes black keeps the job straightforward.
DIY versus a professional finish
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Honest limits
We’ll always be straight with you, so here’s what sealant can’t fix:
- Leaking fittings rather than failed sealant
- A tray or bath that isn’t properly supported, until it’s fixed
- Broken tiles or a split tray
If in doubt, call 0345 464 0079 or email us and we will say what we think.
Where we work in Rock
- Kitchens
- Skirting & floors
- Show homes
- Bathrooms & en suites
- Plot handovers
- Windows & doors