Kent · England
St Mary in the Marsh New Build Mastic
New build mastic across St Mary in the Marsh and nearby, with every bit of old sealant taken out first.
- Shower seals failing in the first year or two
- Gaps behind new kitchen upstands
- Cracked caulk along new skirting
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
New build mastic in St Mary in the Marsh
Some owners wait for the first year’s movement before having joints redone. For small cosmetic gaps, that is reasonable, but a failed shower or bath seal shouldn’t wait. If you are dealing with internal frame sealant that has split and new-build shower sealant that has already split, we can put it right, on skirting & floors, plot handovers and kitchens alike.
In a village or hamlet like St Mary in the Marsh, 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.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- St Mary in the Marsh (TN29)
- Region
- Kent
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near St Mary in the Marsh
What else we do in St Mary in the Marsh
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Look at the sealant regularly in the first couple of years
- Keep water off fresh sealant until it has cured
- Avoid scourers and strong chemicals on sealant
- Raise failed sealant with the developer while you’re covered
Ventilation matters in a new home, which is still drying out. Run the fan or open a window after bathing to help keep mould away.
Mould takes hold quickly in sealant that has gaps or lifted edges. Dealing with it before it goes black saves a harder job later.
Signs you need new build mastic in St Mary in the Marsh
New homes are full of moisture from plaster, screed and concrete, which takes a year or two to dry out. As it does, timber shrinks and joints open and the sealant has to cope with the movement.
Signs it’s time to call us include:
- Skirting joints opening in the first winter
- Smeared, uneven beads picked up at snagging
- Gaps behind new kitchen upstands
- Sealant applied over dusty or wet surfaces
Around St Mary in the Marsh, as everywhere, new build mastic is only as good as the preparation behind it.
Before you book anyone
- How the joint is cleaned and prepared
- Is the old sealant removed completely?
- How long to leave it before use
- How long the guarantee is
St Mary in the Marsh: your questions answered
What guarantee comes with new build mastic in St Mary in the Marsh?
All our work, in St Mary in the Marsh and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Is St Mary in the Marsh within the area you cover?
Yes, we do. Our work covers 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 it worth trying it myself?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
How long does the job take?
Typically it takes a few hours for most snagging lists, longer for a run of plots. Larger jobs naturally take longer, and we will tell you how long to expect.
When is the best time to reseal in a new build?
Any seal that is leaking should be redone straight away. Cosmetic gaps can wait until the first year or two of movement has passed.
Why does sealant fail so quickly in new builds?
It’s common, and there are usually two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We’ll tell you how long to leave the joint before we leave.
Quotes for new build mastic in St Mary in the Marsh
Some jobs are bigger than they look, and some smaller. The main factors:
- Mould in or behind the old joints
- The number of rooms or windows
- Which sealant suits the joint
- How easy the joints are to reach
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start, so you know where you stand.
Helping us quote
When you call or email, it’s useful to know:
- The type of property
- What’s wrong with the joints now
- Any previous sealing or DIY work
- Photos by email, if that’s easy
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to several days, depending on the number of plots. Somewhere like St Mary in the Marsh needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely.
- 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
- Try not to wet indoor joints just before the visit
- Keep children and pets away from the work area
- On commercial sites, let us know about site rules
Ask for a quote
There’s no standard price list. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or drop us an email.
Related advice
New build mastic in St Mary in the Marsh: local notes
St Mary in the Marsh is within about 2 miles of the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so it’s worth checking at snagging. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For jobs in and around St Mary in the Marsh, choosing the right material for each joint is as important as a tidy finish.
St Mary in the Marsh is about 7 miles south-west of Hythe, in Kent. Anywhere in TN29, our applicators can take on new build mastic. St Mary in the Marsh is one of 922 towns and villages in Kent where we work for new build mastic. Brighton is on our list too, around 48 miles away.
All of TN29 is covered for new build mastic. Whether your property is on Wades Close, Rectory Road and Pickneybush Lane or a nearby road, our applicators can take on the job. Neighbouring places we cover for new build mastic include St Mary's Bay (1 mile east), Newchurch (2 miles north), Burmarsh (3 miles north-east), Postling Green (5 miles north) and Bonnington (5 miles north). Further out, we also cover Ashford (9 miles north), Folkestone (11 miles north-east), Hythe (7 miles north-east), Hawkinge (12 miles north-east), Tenterden (12 miles west) and Cheriton (10 miles north-east).
Near you in St Mary in the Marsh
Typical jobs here are in homes near Romney Warren Country Park and The Star Inn, among other places. A little further out are Romney 'castle' (2.5 miles south-west) and Brenzett Aeronautical Museum (3.5 miles west).
Surface by surface
Plot handovers
Taking time over preparation reduces return visits. We clean out building dust before sealing.
Bathrooms and en suites
Shower trays in new homes often move slightly in the first year. We reseal once the old bead is fully out.
Leave it or put it right?
A tube of sealant from the DIY shop won’t fix the cause: dust, no primer and old sealant left in the joint. Proper removal and preparation are what make it last. Around St Mary in the Marsh, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
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 book with us
- Colour agreed with you before work begins
- We leave the area clean and tidy
- An ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
Read our cost guide and customer reviews.