West Sussex · England
Coldwaltham New Build Mastic
New build mastic for Coldwaltham, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Sealant work across a run of new homes
- Gaps opening as the house dries out and settles
- Beads laid onto grit and dust from the build
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
If you are 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 fails, we can still redo it.
New build mastic in Coldwaltham
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. Both get the same care over preparation. We work on windows & doors, kitchens and plot handovers, and common reasons people get in touch are kitchen sealant that has pulled off the wall and gaps between new skirting and floors.
Work in a small place like Coldwaltham just needs the journey and access planning, and the work itself is the same as on any site.
A one-year guarantee comes as standard, so you’re covered after we have gone.
- Where
- Coldwaltham (RH20)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Joints and finishes in Coldwaltham homes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Coldwaltham, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint. If you’ve bought a new home near Pulborough station, the sealant around baths, showers and frames is worth checking in the first year or two.
Coldwaltham is about 9 miles north of Littlehampton, in West Sussex. We carry out new build mastic for householders, landlords and businesses in Coldwaltham and the surrounding area. Coldwaltham is one of 371 places in West Sussex where we work. You can also see our page for Crawley, roughly 19 miles from Coldwaltham.
Here we cover the RH20 postcode area for new build mastic. Whether your property is on London Road, Old London Road and Silverdale or anywhere close by, our applicators can take on the job. Close by, we work in Watersfield (1 mile south-west), Hardham (1 mile north-east), Lower Horncroft (1 mile north-west), Coates (2 miles north-west) and Fittleworth (2 miles north-west). Larger places within reach include Horsham (13 miles north-east), Worthing (10 miles south-east), Bognor Regis (12 miles south-west), Chichester (12 miles south-west), Littlehampton (9 miles south) and Shoreham-by-Sea (14 miles south-east).
Local landmarks in Coldwaltham
Locally, jobs take us to homes and businesses close to The Labouring Man pub and Lodge Hill Residential Centre and the streets around them. Coldwaltham’s nearest station is Pulborough station, roughly 1.8 miles north-east. Nearby you will also find Amberley Museum (2.8 miles south) and Amberley Castle (2 miles south). Green spaces nearby include Amberley Wildbrooks RSPB Reserve and Bignor Hill.
Different surfaces, different methods
Kitchens
Beside the sink, the joint takes water every day. We use a sealant suited to kitchens suited to the job.
Skirting and floors
Floors and skirting move as the house dries and the heating runs. Caulk cracks; a flexible sealant moves with it.
What happens if it’s left?
DIY kits do not solve the main problems with new-build sealant: dust, no primer and old sealant left in the joint. Cutting out, cleaning and priming are what make the difference. Older cottages and farmhouses around Coldwaltham 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’ll have a clear quote before any work starts.
Why book with us
- We never seal over old sealant
- Sanitary silicone with an anti-fungal additive in wet areas
- 12-month guarantee on every job
- Colour picked to suit the job
Nearby places to Coldwaltham
More services for Coldwaltham
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Watch for new gaps as the house dries out
- Raise failed sealant with the developer while you are covered
- Act quickly if a seal starts to leak
- Open a window or run the fan after bathing
Don’t stand on the bath edge or the lip of the tray while the sealant cures. If a bath or tray moves when you stand in it, get it looked at.
Lifting sealant traps moisture and mould behind it. Dealing with it before it goes black keeps the job straightforward.
How it works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to several days, depending on the number of plots. Somewhere as small as Coldwaltham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We go through the snagging list or plot schedule and agree the joints to do.
- Failed or untidy sealant is cut out completely.
- Each joint is cleaned of dust and grit, then primed if required.
- We apply a sealant that suits each joint and tool it to a neat finish.
- We check every joint and tell you how long each needs to cure.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
Get a quote
We quote each job on its own, so start by telling us what you need. Simply call 0345 464 0079 or drop us an email and describe the job and send photos if you have them.
Read more
Honest limits
We will not take on work that will not last, so here’s what sealant can’t put right:
- Leaks from pipes, valves or wastes, which need a plumber
- Deciding who is responsible under a builder’s warranty
- Cracking that points to a structural problem
If in doubt, ring 0345 464 0079 or drop us an email and we will say what we think.
Joints and surfaces we work on
- Bathrooms & en suites
- Windows & doors
- Skirting & floors
- Plot handovers
- Kitchens
- Show homes
Landlord and commercial work in Coldwaltham
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 the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Common questions in Coldwaltham
Do you cover Coldwaltham for new build mastic?
Yes. Our work covers London and the South East, and Coldwaltham is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
Do you cover smaller places like Coldwaltham?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator.
How long should I leave it?
Many sealants skin over quickly but take longer to cure fully. We will give you the cure time for the product we used before we leave.
What colour sealant will you use?
The colour is chosen to suit the tiles, worktop or frame. Let us know your preference when you ask for a quote.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you don’t need to watch us work.
Should I wait before resealing?
Where water is getting through, do not wait. Hairline cosmetic gaps can wait until the house has settled.
How do I get a quote for new build mastic in Coldwaltham?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You will get a clear quote before any work starts.