Kent · England
New-build mastic & snagging in How Green, Kent
We cover How Green for plot mastic for developers and snagging failed sealant in new homes. Old material cut out, joints cleaned and sealed neatly and a 12-month guarantee.
- Internal frame sealant that has split
- Shower seals failing in the first year or two
- Kitchen sealant that has pulled off the wall
Questions from How Green
Will you come out to How Green?
Yes. How Green is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is How Green in your area for new build mastic?
Yes, How Green is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
How long will you be here?
That depends on how much there is to do, but as a guide it takes a few hours in a single home. We’ll give you a better idea when we quote.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Why does sealant fail so quickly in new builds?
Lots of new homes see sealant crack early, because the house is drying and settling. Poor preparation at handover adds to it.
Do I have to be there?
It depends on the job. Inside work needs someone to give us access.
How much does new build mastic cost in How Green?
Every job is different, so each one gets its own quote. For a quick quote, phone 0345 464 0079 or send us an email and let us know what needs doing and where.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
New build mastic in How Green, done properly
Failed shower seals, gaps along the skirting and messy beads are common items on a new-home snagging list. While the builder’s snagging or warranty period runs, report it to them first and if that stalls, we can do it. We work on bathrooms & en suites, plot handovers and windows & doors, and common reasons people get in touch are gaps opening as the house dries out and settles and frame joints opening as the plaster dries.
Work in a small place like How Green just needs the journey and access planning, and once on site, the job is the same as anywhere.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or drop us an email.
- Location
- How Green (TN8)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
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 does not work out, we can still put it right.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Do you need new build mastic in How Green?
Not every new-build joint gets the right sealant: decorators’ caulk in a wet area, or a stiff sealant where there’s movement. Neither lasts long.
If you can see any of these, it’s time to have the joints looked at:
- Cracked caulk along new skirting
- Smeared, uneven beads picked up at snagging
- Second-fix sealing on new plots
- Cracks appearing as a new home settles
Around How Green, as everywhere, new build mastic is only as good as the preparation behind it.
Before you book anyone
- What the cure time is
- Who turns up on the day
- What preparation is included
- Whether the sealant suits the joint
Places near How Green
Other services in How Green
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
- Resist patching a failed seal with a tube from the DIY shop
- Follow the cure time we give you
- Clean sealant with mild detergent, not abrasives
Do not stand on the bath edge or the lip of the tray. If a bath or tray moves when you stand in it, get it looked at.
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.
For landlords and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured.
What affects the cost of new build mastic
For a quick quote, just ask. The main things that affect it are:
- Mould in or behind the old joints
- The size of the job
- Whether old sealant or filler has to be cut out
- Whether the work is at height
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or send us an email.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- The type of property
- Where the job is, and your postcode
- Any access issues, like height or stairs
- Whether it has been sealed before
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details, and photos are welcome.
How it works
On the day, we look over the joints with you first, so you know exactly what we’re doing. We protect the surfaces around the joints before we start. Most jobs take a few hours for most snagging lists, longer for a run of plots. Somewhere as small as How Green, access is often the only tricky part. 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.
- The old bead comes out in full, with no layer left behind.
- Each joint is cleaned of dust and grit, then primed if required.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
How to prepare
- Mention if the joints have been sealed before
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
Asking for a quote is easy: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand.
Advice
Why it’s worth doing now in How Green
Small cosmetic gaps can wait for the house to settle, but water getting through can’t. Not sure whether yours can wait? You can ring 0345 464 0079 or drop us an email with a few pictures. Where a wall is exposed, as many are in small places like How Green, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why How Green clients choose us
- Any old sealant cut out fully, not covered over
- Anti-fungal sanitary silicone in wet areas
- Colour picked to suit the job
- A choice of colours where the product allows
See what affects the cost and customer reviews.
New homes and floors in How Green
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For new homes near Hever station, it’s worth checking the sealant early, while snags are still fresh.
How Green is about 7 miles south-west of Sevenoaks, in Kent. Wherever you are in the TN8 postcode area, we can carry out new build mastic at your property. How Green is one of 922 places in Kent we cover. You can also see our page for Crawley, about 14 miles away.
We cover every part of the TN8 postcode area for new build mastic. We cover properties on Hever Road and How Green Lane and the roads around them. If you are just outside How Green, we cover Hever (1 mile south), Newtown (2 miles south), Markbeech (2 miles south), Chiddingstone Causeway (3 miles east) and Chiddingstone Hoath (3 miles south-east). Larger places within reach include Sevenoaks (7 miles north-east), Royal Tunbridge Wells (8 miles south-east), Tonbridge (7 miles east), Swanley (14 miles north), Kings Hill (14 miles east) and Paddock Wood (12 miles east).
Landmarks near How Green
Typical jobs here are in homes near The Wheatsheaf Public House and Chiddingstone Castle Park and Gardens, among other places. The closest station to How Green is Hever station, about 1.3 miles south-west of the centre. Well-known places in the area include Tandridge Priory (5.4 miles north-west) and Hever Castle (0.7 miles south).