Kent · England
Knatts Valley New Build Mastic
Professional new build mastic in and around Knatts Valley, with every bit of old sealant taken out first.
- Smeared, uneven beads picked up at snagging
- Cracks appearing as a new home settles
- Plot mastic for developers ahead of handover
New build mastic around Knatts Valley
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Knatts Valley, as everywhere, new build mastic is only as good as the preparation behind it.
Knatts Valley is about 4 miles north-east of Sevenoaks, in Kent. From the centre of Knatts Valley to the outskirts, we cover new build mastic for every kind of property. Across Kent, we cover 922 places, and Knatts Valley is one of them. We also work in London, around 19 miles away.
Here we cover the TN15 postcode area for new build mastic. New build mastic is available to properties on Knatts Lane and Knatts Valley Road. If you are just outside Knatts Valley, we cover East Hill (1 mile north-west), Woodlands (1 mile south), Romney Street (1 mile west), West Kingsdown (1 mile north-east) and Cotman's Ash (1 mile south). Larger places within reach include Maidstone (13 miles east), Dartford (8 miles north), Sevenoaks (4 miles south-west), Royal Tunbridge Wells (14 miles south), Gravesend (9 miles north-east) and Tonbridge (9 miles south).
Landmarks near Knatts Valley
We work in homes and buildings around Kemsing Down, among other places. For rail, the closest station is Kemsing station, roughly 2.5 miles south. Nearby you’ll also find Sevenoaks Hospital (3.9 miles south-west) and Kemsing Castle Bank (2 miles south-west).
New build mastic for homes and businesses in Knatts Valley
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 are often asked to deal with gaps behind new kitchen upstands and untidy sealant flagged on a snagging list, on kitchens, plot handovers and show homes.
Somewhere as small as Knatts Valley, 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.
Big or small, you get the same one-year guarantee in Knatts Valley and across Kent.
- Where
- Knatts Valley (TN15)
- Wider area
- Kent
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Why act early in Knatts Valley
A hairline gap at a skirting can wait, but a leaking seal can’t. If you’re unsure which you have, ring 0345 464 0079 or drop us an email with photos and we will tell you. In a small place like Knatts Valley, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why us?
- Full insurance on every job
- An ARBOMaster approved applicator
- 180+ five-star Google reviews
- Colour picked to suit the job
Read what affects the cost or customer reviews.
Also near Knatts Valley
Also in Knatts Valley
Questions from Knatts Valley
Is Knatts Valley within the area you cover?
Yes. Knatts Valley is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you cover Knatts Valley for new build mastic?
Yes, Knatts Valley is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
What information do you need?
Only a few details: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or email us.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us and we’re fully insured.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we are using and why.
Will it make a mess?
We keep the work tidy. Nearby surfaces are protected.
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Report sealant problems to your builder during the snagging period
- Do not wait for the house to settle if water is getting through
- Keep water off fresh sealant until it has cured
- Do not seal over failed sealant yourself
Avoid standing on the rim of the bath or the edge of the tray in the first few weeks. Report any movement in a bath or tray.
Early snagging is easier snagging. Left alone, a small crack can become a leak.
Can I do it myself?
If you’re 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 doesn’t work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
For landlords and businesses
For anyone letting property in or around Knatts Valley, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
We also work for property managers and facilities teams. We can quote a run of properties together.
The process
All our tools and materials come with us in the van. Once we’ve agreed what’s being done, we protect the area and start. Most jobs take a few hours in a single home. In a small place like Knatts Valley, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we work through your snagging list or plot schedule with you.
- Failed or untidy sealant is cut out completely.
- 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
- Let us know about earlier repairs to the joints
- Let us know if you’ve seen damp or leaks
- For business premises, tell us about site rules or sign-in
Ask for a quote
Getting a quote is simple: tell us what needs doing and where. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
Surface by surface
Kitchens
Beside the sink, the joint takes water every day. We use a sealant suited to kitchens, food-safe where it’s needed.
Plot handovers
Good preparation at handover saves snagging later. Dust from the build is removed first and prime where the product needs it.
When to call us in Knatts Valley
A new house holds a lot of water from the build, which takes a year or two to dry out. Drying timber shrinks and pulls joints apart.
If you can see any of these, it’s time to have the joints looked at:
- Smeared, uneven beads picked up at snagging
- Internal frame sealant that has split
- Cracked caulk along new skirting
- Shower seals failing in the first year or two
For new homes near Kemsing station, it’s worth checking the sealant early, while snags are still fresh.
What to look for in a quote
- Which sealant they’ll use, and why
- What happens if they find a problem under the old sealant
- Whether they’re fully insured
- How the joint is cleaned and prepared