Kent · England
New Build Mastic in Knockholt
Specialist new build mastic for Knockholt: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Cracks appearing as a new home settles
- Worktop and upstand sealant coming away
- Sealant applied over dusty or wet surfaces
What new build mastic looks like in Knockholt
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For new homes near Knockholt station, it’s worth checking the sealant early, while snags are still fresh.
Knockholt is about 4 miles north-west of Sevenoaks, in Kent. Jobs in Knockholt get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 922 towns and villages across Kent, from the larger towns to small villages. There’s also a page for London, about 16 miles away.
We work across the TN14 postcode area for new build mastic. You’ll find streets such as Main Road and Blueberry Lane, and we cover them all. Close by, we work in Knockholt Pound (1 mile north-east), Halstead (2 miles north-east), Sepham Heath (2 miles north-east), Pratt's Bottom (2 miles north) and Twitton (3 miles east). Further out, we also cover Dartford (11 miles north-east), Sevenoaks (4 miles south-east), Royal Tunbridge Wells (14 miles south-east), Gravesend (14 miles north-east), Tonbridge (11 miles south-east) and Northfleet (13 miles north-east).
Near you in Knockholt
Typical jobs here are in homes near The Three Horseshoes pub, among other places. For rail, the closest station is Knockholt station, about 2.7 miles north-east of the centre. Other landmarks nearby include Orpington Hospital (3.6 miles north) and Otford Heritage Centre (3.9 miles east). Open spaces near Knockholt include Betsom's Hill and Downe Bank.
New build mastic in Knockholt
Across Knockholt, we work for both new-home owners and the builders handing those homes over. Whether it’s one en suite or a run of plots, the method is the same: cut out, clean, prime where needed and reseal neatly. Common call-outs are for second-fix sealing on new plots and sealant applied over dusty or wet surfaces, across bathrooms & en suites, show homes and windows & doors.
In a village or hamlet like Knockholt, new homes are more likely to be a barn conversion or a handful of houses than a big estate. Every one needs its sealant and floor joints done properly, whatever the size of the site.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or email us.
- Location
- Knockholt (TN14)
- Wider area
- Kent
- Cover
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Knockholt
Fresh sealant can be knocked or cut by trades finishing off. A bead disturbed before it has cured may never seal properly, and the problem shows up after you move in.
Most people get in touch when they notice one of these:
- Cracks appearing as a new home settles
- Cracked sealant around new window and door frames
- Gaps between new skirting and floors
- Untidy sealant flagged on a snagging list
Around Knockholt, as everywhere, new build mastic is only as good as the preparation behind it.
Comparing quotes
- Whether the sealant suits the joint
- What the cure time is
- Who turns up on the day
- Is the old sealant removed completely?
What happens on the day
The work is kept neat and contained to the area we are working on. The job generally takes a few hours for most snagging lists, longer for a run of plots, and we tell you how long to leave it before we go. Somewhere like Knockholt needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- We cut out every bit of the failed or messy sealant.
- Surfaces are cleaned of building dust and primed where needed.
- New sealant suited to each joint is applied and tooled neatly.
- Finally, each room is checked and you’re given the cure time.
Preparing for the visit
- Clear items away from the joints we’re working on
- Keep pets and children clear of the area while we work
- Mention any sign-in or site rules at work premises
How to get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Related advice
Knockholt: your questions answered
Do you cover smaller places like Knockholt?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you do new build mastic in Knockholt?
Yes. We work across London and the South East, and Knockholt is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job.
Is there a guarantee?
Yes. Each job is guaranteed for twelve months, large or small.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Do you work for letting agents?
Yes, regularly. Several properties can go on one quote.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you work for developers?
Yes. We seal plots to the developer’s programme. Tell us the plots and the joints involved for a clear quote.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses.
Nearby places to Knockholt
What else we do in Knockholt
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Why act early in Knockholt
A tube of sealant from the DIY shop will not fix the cause: grit, unprimed surfaces and old layers underneath. Cutting out, cleaning and priming are what make the difference. In a small place like Knockholt, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before work begins, so you know where you stand.
Why book with us
- White, clear, grey or coloured to suit, where the product allows
- Every job guaranteed for a year
- We never seal over old sealant
- Domestic, commercial and hotel work
Take a look at what affects the cost and customer reviews.
Looking after it afterwards
To keep the joints looking good and working properly:
- Don’t seal over failed sealant yourself
- Get a leaking seal dealt with right away
- Ventilate bathrooms well, especially in the first year
- Keep photos and emails about snagging items
Follow the cure time we give you before the area gets wet. Most silicones need around a day before water reaches them.
Lifting sealant traps moisture and mould behind it. Dealing with it before it goes black saves a harder job later.
What we can’t put right
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Settlement cracks that need a surveyor
- Cracked trays, tiles or worktops
- Movement caused by a poorly fitted tray or bath
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Show homes
- Skirting & floors
- Kitchens
- Bathrooms & en suites
- Windows & doors
- Plot handovers
What the job involves on each surface
Show homes
We seal show-home bathrooms, kitchens and frames ready for viewings. We’ll plan around viewing times.
Kitchens
Worktops in new homes can move slightly as the house dries, which opens gaps along the back. We reseal them with a flexible sealant.