Kent · England
Southernden New Build Mastic
New-build sealant joints in Southernden need attention? We cut out the old, prepare the joints and apply the right sealant.
- Sealant work across a run of new homes
- Smeared, uneven beads picked up at snagging
- Cracks appearing as a new home settles
About our new build mastic in Southernden
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, because that is what rushed new-build sealant generally lacks. We’re often asked to deal with cracks appearing as a new home settles and gaps behind new kitchen upstands, across bathrooms & en suites, kitchens and skirting & floors.
Around Southernden, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
All our work comes with our one-year guarantee, wherever you are in Kent.
- Place
- Southernden (TN27)
- Wider area
- Kent
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
Sealant done properly at handover means fewer callbacks. Every return visit for a failed seal takes time. Older cottages and farmhouses around Southernden can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Leaving a failed joint normally makes the job bigger, not smaller. If you are unsure, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
What you get with us
- A sealant colour to suit the surroundings
- Rated 4.9 stars on Google
- Fully insured
- Domestic, commercial and hotel work
Read our cost guide and our reviews.
What we’re called out for in Southernden
If plaster or screed was still damp when it was sealed, the bond suffers. Site programmes don’t always leave time for joints to dry.
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
- Worktop and upstand sealant coming away
- Second-fix sealing on new plots
For new homes near Headcorn station, it’s worth checking the sealant early, while snags are still fresh.
What to look for in a quote
- What product goes in the joint
- What happens if the job turns out different
- Whether all the old sealant comes out first
- What the quote includes, VAT included or not
DIY versus a professional finish
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.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
How it works
The work is kept neat and contained to the joints we’re treating. Expect the work to take 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 as small as Southernden, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by agreeing which joints are on the list, from the snagging sheet or plot schedule.
- The old bead comes out in full, with no layer left behind.
- Each joint is cleaned of dust and grit, then primed if required.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Finally, each room is checked and you’re given the cure time.
Before we arrive
- Mention any tricky access
- Plan for the work area to be out of bounds to pets and children
- Mention any parking rules near the property
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.
Related advice
New build mastic in Southernden: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In and around Southernden, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Southernden is about 8 miles south-east of Maidstone, in Kent. Jobs in Southernden get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Southernden is one of 922 towns and villages in Kent where we work for new build mastic. We also work in Crawley, about 37 miles from Southernden.
We cover every part of TN27 for new build mastic and the streets around it. If you’re just outside Southernden, we cover Swift's Green (1 mile south), Smarden Bell (2 miles south), Headcorn (2 miles south-west), Hearnden Green (2 miles west) and Biddenden Green (2 miles south-east). Further out, we also cover Maidstone (8 miles north-west), Ashford (9 miles east), Sittingbourne (11 miles north), Faversham (13 miles north-east), Kings Hill (13 miles north-west) and Davington (13 miles north-east).
Landmarks near Southernden
For rail, the closest station is Headcorn station, about 2.1 miles south-west. Well-known places in the area include Coldbridge Castle (1.7 miles north-east) and Kent Firefighting Museum (3.8 miles south-west).
Your questions about new build mastic in Southernden
Is Southernden in your area for new build mastic?
Yes, Southernden 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, and we will give you a clear quote.
Do you cover smaller places like Southernden?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Why has my new-build shower seal failed already?
New homes dry out and move in their first couple of years, and sealant is often applied quickly onto dusty surfaces. Both lead to early failure.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you do not need to watch us work.
Is the work guaranteed?
Yes: twelve months. If anything isn’t right with the work within the year, let us know and we will sort it.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or email us.
How do I get a quote for new build mastic in Southernden?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will quote.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
What affects the quote in Southernden
We quote each job individually. This is what makes a difference:
- Any working-time requirements on site
- Any mould that needs treating
- How easy the joints are to reach
- The number of rooms or windows
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or drop us an email.
Helping us quote
When you contact us, it’s useful to know:
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- Photos by email, if that is easy
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.
Nearby places to Southernden
What else we do in Southernden
When it is not the sealant
Some problems need a builder, plumber or other trade rather than us:
- Deciding who is responsible under a builder’s warranty
- Cracked trays, tiles or worktops
- Structural cracks in walls or ceilings
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Skirting & floors
- Kitchens
- Bathrooms & en suites
- Windows & doors
- Show homes
- Plot handovers