Hampshire · England
Keyhaven New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes in Keyhaven, with a one-year guarantee on every job. Call for a quick quote.
- Kitchen sealant that has pulled off the wall
- Joints pulling apart as timber shrinks
- Shower seals failing in the first year or two
About our new build mastic in Keyhaven
New homes move as they dry out. Timber shrinks, plaster dries and baths and trays bed down, and sealant applied in a hurry at handover can split. We work on bathrooms & en suites, windows & doors and kitchens, and common reasons people get in touch are frame joints opening as the plaster dries and second-fix sealing on new plots.
Older homes in small places like Keyhaven often have timber floors that move with the seasons, so skirting and threshold joints need a flexible sealant rather than a rigid filler.
Big or small, it’s backed by our 12-month guarantee.
- Place
- Keyhaven (SO41)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for new build mastic
Every job gets its own quote. This is what makes a difference:
- The size of the job
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- How many areas need sealing
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.
What we need to know
To help us quote quickly, please include:
- Any access issues, like height or stairs
- A few pictures by email, if you can
- Whether it’s a home or a business
- Where the property is
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work and send you a clear quote.
What the job involves on each surface
Skirting and floors
Gaps under skirting are one of the most common new-build snags. We seal it with a flexible sealant that copes with the movement.
Kitchens
Sink joints are wet all the time. A kitchen sealant goes in there suited to the job.
New build mastic in Keyhaven: local notes
Keyhaven is within about 1 mile of the coast. New homes near the sea put their outside mastic to work from day one, so any gaps are best picked up early. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you’ve bought a new home near Lymington Town station, the sealant around baths, showers and frames is worth checking in the first year or two.
Keyhaven is about 3 miles south of Lymington, in Hampshire. Jobs in Keyhaven get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Keyhaven is one of 683 places in Hampshire we cover for new build mastic. There’s also a page for Southampton, roughly 16 miles from Keyhaven.
Work in SO41 is quoted and booked the same way as anywhere else. If you need new build mastic at a property on New Road, Keyhaven Road and Saltgrass Lane or anywhere close by, our applicators can take on the job. We also cover Milford on Sea (1 mile west), Lymore (1 mile north-west), Lower Pennington (1 mile north-east), Everton (2 miles north-west) and Pennington (2 miles north). Within a short drive, we also cover Totton (14 miles north), Hythe (12 miles north-east), New Milton (4 miles north-west), Ringwood (13 miles north-west), Warsash (15 miles north-east) and Barton on Sea (4 miles west).
Landmarks near Keyhaven
Locally, jobs take us to homes and businesses close to The Gun Public House and Priestlands School and the streets around them. The nearest railway station is Lymington Town station, about 3 miles north-east. Well-known places in the area include St Barbe Museum and Art Gallery (2.8 miles north-east) and Yarmouth Castle (3.3 miles east). For a walk, there’s Milford on Sea LNR and Tennyson Down.
Landlord and commercial work in Keyhaven
Hotels need rooms back in use, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
Landlords and letting agents in Keyhaven can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
Common questions in Keyhaven
Do you cover smaller places like Keyhaven?
Yes. Keyhaven 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.
Can you help a landlord with a rental near Lymington Town station?
Yes. We work for letting agents and landlords as well as householders. You can call 0345 464 0079 or email us with the details for a clear quote.
How much does new build mastic cost in Keyhaven?
Every job is different, so each one gets its own quote. To get one, call 0345 464 0079 or send us an email and tell us what needs doing and where.
Can you work on commercial sites?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
How long should I leave it?
Cure times vary by product and the conditions. Before we leave, we will tell you the cure time.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. Then call 0345 464 0079 or send us an email.
Does someone need to be in?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
The process
We bring everything the job needs with us, so you don’t need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. Most jobs take a few hours for most snagging lists, longer for a run of plots. Somewhere as small as Keyhaven, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- We tool every joint neatly and tell you when each area can be used.
How to prepare
- Tell us if parking is tricky
- Mention any leaks or damp you’ve noticed
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or drop us an email.
Related advice
Also near Keyhaven
Other services in Keyhaven
When to call us in Keyhaven
Fresh sealant can be knocked or cut by trades finishing off. A bead disturbed before it has cured may never seal properly and it shows once the home is in use.
These are the problems we’re asked about most:
- Gaps behind new kitchen upstands
- Messy sealant that spoils new finishes
- Frame joints opening as the plaster dries
- Cracked caulk along new skirting
In and around Keyhaven, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Before booking anyone
- How the colour is chosen
- What insurance they hold
- How long the guarantee is
- Which sealant they’ll use, and why
What happens if it’s left?
If you’re still in the builder’s snagging or warranty period, ask them to put it right first. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. In a small place like Keyhaven, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why Keyhaven customers choose us
- Approved under the ARBOMaster scheme
- Domestic, commercial and hotel work
- White, clear, grey or coloured to suit, where the product allows
- Rated 4.9 stars on Google
Read how sealant jobs are priced or our reviews.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.