Kent · England
Castle Hill New Build Mastic
New-build sealant joints in Castle Hill need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Worktop and upstand sealant coming away
- Sealant applied over dusty or wet surfaces
- Gaps between new skirting and floors
New build mastic for homes and businesses in Castle Hill
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’s what rushed new-build sealant usually lacks. We’re often asked to deal with leaking shower tray seals in a new home and beads laid onto grit and dust from the build, across plot handovers, windows & doors and bathrooms & en suites.
Somewhere as small as Castle Hill, new homes tend to be conversions, self-builds or a few houses rather than an estate. Every one needs its sealant and floor joints done properly, whatever the size of the site.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Castle Hill (TN12)
- Region
- Kent
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens if it’s left?
DIY kits don’t 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 Castle Hill can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why us?
- Full insurance on every job
- We agree the colour with you first
- A choice of colours where the product allows
- Neat joints and a tidy finish
See what affects the cost and what customers say.
What we do, step by step
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours for most snagging lists, longer for a run of plots, and the area is left clean. For a village or hamlet like Castle Hill, 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.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- Failed or untidy sealant is cut out completely.
- We clean off dust from the build and prime the surfaces where the product needs it.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
Before we arrive
- Keep children and pets away from the work area
- Mention any leaks or damp you’ve noticed
- Mention any parking rules near the property
Getting a quote
Want a quote for new build mastic? Please call 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and send you a clear quote before work begins.
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When something else is needed
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Damaged fittings that need replacing
- Baths and trays that move too much for sealant to cope with
- Settlement cracks that need a surveyor
If you’re not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Surfaces we seal
- Plot handovers
- Bathrooms & en suites
- Skirting & floors
- Show homes
- Windows & doors
- Kitchens
How the job changes by surface
Skirting and floors
Where the floor meets a bath panel or kitchen plinth, the joint keeps mop water out. They get a flexible, water-resistant sealant.
Bathrooms and en suites
Trays and baths in new builds settle as they’re used. The joint is stripped back before the new bead goes in with baths filled first.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Clean sealant with mild detergent, not abrasives
- Act quickly if a seal starts to leak
- Wait for the cure time before using a resealed shower
- Look at the sealant regularly in the first couple of years
Photograph failed sealant before it’s redone and keep the builder’s replies. It’s useful if you need to raise other issues later.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Catching it early keeps the fix to the sealant and protects the rest of the house.
For landlords and businesses
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Housing providers, facilities teams and property managers book us too in Castle Hill and across Kent. We can quote a run of properties together, and we are fully insured for the work.
New build mastic around Castle Hill
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In and around Castle Hill, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint. If you’ve bought a new home near Paddock Wood station, the sealant around baths, showers and frames is worth checking in the first year or two.
Castle Hill is about 7 miles east of Royal Tunbridge Wells, in Kent. For new build mastic in and around Castle Hill, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We’re based in Crawley and cover Kent, Castle Hill included. 922 places in Kent are on our list. Our Crawley page covers work nearby.
Our applicators cover all of TN12 for new build mastic. We cover properties on Crook Road and Pearson's Green Road and the roads around them. We also cover Palmer's Green (1 mile south-west), Pearson's Green (1 mile north-east), Mile Oak (1 mile north-west), Horsmonden (1 mile south-east) and Hazel Street (2 miles south). We also work in nearby towns such as Maidstone (9 miles north-east), Sevenoaks (13 miles north-west), Royal Tunbridge Wells (7 miles west), Tonbridge (7 miles north-west), Kings Hill (8 miles north) and Foley Park (10 miles north-east).
Near you in Castle Hill
In Castle Hill, that means homes and buildings near The Castle Inn and Mascalls School and the streets around them. The nearest railway station is Paddock Wood station, about 2.2 miles north-west. Well-known places in the area include The Hop Farm Museum (3 miles north) and Tunbridge Wells Hospital (4.7 miles west). Green spaces nearby include Tudeley Woods RSPB reserve.
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Castle Hill: your questions answered
I let a flat near Paddock Wood station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Can you do new build mastic in Castle Hill?
Yes. Our work covers London and the South East, and Castle Hill is part of that. Just call 0345 464 0079 or send us an email with a few details of the job.
Do you remove the old sealant?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Are you insured?
Yes, we’re fully insured.
Is the work guaranteed?
Yes. Every job comes with a one-year guarantee.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We will tell you what we’re using and why.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you when we finish.