Kent · England
New Build Mastic in Sepham Heath
We cover Sepham Heath for plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly.
- Shower seals failing in the first year or two
- Sealant applied over dusty or wet surfaces
- Worktop and upstand sealant coming away
About our new build mastic in Sepham Heath
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. Common call-outs are for sealant work across a run of new homes and skirting joints opening in the first winter, across skirting & floors, bathrooms & en suites and kitchens.
Around Sepham Heath, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Sepham Heath (TN14)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we cannot put right
To be straight with you, some problems need a different trade:
- Structural cracks in walls or ceilings
- Plumbing faults behind the sealant
- Your warranty claim itself, which is between you and the builder
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly before booking.
Where we work in Sepham Heath
- Skirting & floors
- Show homes
- Windows & doors
- Kitchens
- Plot handovers
- Bathrooms & en suites
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Looking after it afterwards
To keep the joints looking good and working properly:
- Photograph failed sealant before it’s redone
- Raise failed sealant with the developer while you’re covered
- Do not wait for the house to settle if water is getting through
- Follow the cure time we give you
Leave the sealant for the cure time we give you before showering or bathing. Most silicones need around a day.
Report failed sealant to the builder while you are in the snagging period. After that, putting it right may fall to you.
Leave it or put it right?
A failed shower or bath seal in a new home lets water into floors and walls that are still drying out. Dealing with it early keeps the damage away from ceilings, floors and finishes. Where a wall is exposed, as many are in small places like Sepham Heath, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why Sepham Heath clients choose us
- We never seal over old sealant
- We leave the area clean and tidy
- Sanitary silicone with an anti-fungal additive in wet areas
- A 12-month guarantee on all work
Take a look at our cost guide or our reviews.
How the visit works
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. For a village or hamlet like Sepham Heath, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- 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, with no layer left behind.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
Before we arrive
- Keep children and pets away from the work area
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
How to get 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 give you a clear quote before work begins.
Read more
How the job changes by surface
Show homes
Bathrooms, kitchens and frames in show homes are sealed or resealed to a neat finish. We’ll plan around viewing times.
Bathrooms and en suites
New-build bathrooms and en suites are where sealant fails most often. We cut out the failed bead, clean and prime, and reseal with anti-fungal sanitary silicone.
Signs you need new build mastic in Sepham Heath
Baths and trays settle under load once the home is lived in. A bath sealed empty drops slightly when filled, straining the joint and the sealant may split.
Most people get in touch after spotting one of these:
- Plot mastic for developers ahead of handover
- Sealant applied over dusty or wet surfaces
- Cracks appearing as a new home settles
- Untidy sealant flagged on a snagging list
For new homes near Knockholt station, it’s worth checking the sealant early, while snags are still fresh.
What your quote should include
- How the surfaces are prepared before sealing
- What happens if the job turns out different
- What the cure time is
- Who does the work, and how experienced they are
New homes and floors in Sepham Heath
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 Sepham Heath, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Sepham Heath is about 3 miles north-west of Sevenoaks, in Kent. From the centre of Sepham Heath to the outskirts, we cover new build mastic for every kind of property. 922 places in Kent are on our list. You can also see our page for London, about 16 miles away.
Work in TN14 is quoted and booked the same way as anywhere else. Neighbouring places we cover for new build mastic include Halstead (1 mile north-west), Twitton (1 mile south-east), Badgers Mount (1 mile north), Knockholt Pound (1 mile south-west) and Shoreham (1 mile north-east). We also work in nearby towns such as Dartford (9 miles north), Sevenoaks (3 miles south-east), Royal Tunbridge Wells (14 miles south), Gravesend (12 miles north-east), Tonbridge (10 miles south-east) and Northfleet (11 miles north-east).
Near you in Sepham Heath
In Sepham Heath, that means homes and buildings near Crown Cottages The Rose And Crown Public House and Polhill Bank, among other places. Sepham Heath’s nearest station is Knockholt station, about 1.7 miles north-west. Well-known places in the area include Lullingstone Castle (3.1 miles north-east) and Sevenoaks Hospital (3.1 miles south-east). The countryside around Sepham Heath includes Betsom's Hill and Dryhill Nature Reserve.
Places near Sepham Heath
What else we do in Sepham Heath
Common questions in Sepham Heath
Do you cover smaller places like Sepham Heath?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is Sepham Heath in your area for new build mastic?
Yes, Sepham Heath is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
What do you put in the joint?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us, and we are fully insured.
Why does sealant fail so quickly in new builds?
Lots of new homes see sealant crack early as timber and plaster dry out. Poor preparation at handover adds to it.
Is the work guaranteed?
Yes. There’s a 12-month guarantee on every job, wherever you are.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access.
Do you work through snagging lists?
Yes. Snagging lists are a common starting point for us. We agree the sealant items with you before we start.