Hertfordshire · England
New Build Mastic in Long Marston
Plot mastic for developers and snagging failed sealant in new homes in Long Marston, with a 12-month guarantee on every job. Ask us for a quote.
- Shower seals failing in the first year or two
- Frame joints opening as the plaster dries
- Cracked caulk along new skirting
What affects the cost of new build mastic
Your quote is based on your job. We take into account:
- Working hours on commercial sites
- Whether old sealant or filler has to be cut out
- Mould in or behind the old joints
- The number of rooms or windows
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
What we need to know
Photos by email are helpful but not essential. Please mention:
- Roughly how big the job is
- How we’d reach the joints
- Pictures of the joints, sent by email
- If it’s domestic, commercial or a hotel
Asking for a quote is easy: tell us what needs doing and where. A few photos by email make the job easier to understand.
New build mastic for homes and businesses in Long Marston
Some new-home owners let the house settle before resealing. That makes sense for small gaps that are just cosmetic, but a failed shower or bath seal shouldn’t wait. We work on show homes, skirting & floors and kitchens, and common reasons people get in touch are messy sealant that spoils new finishes and cracks appearing as a new home settles.
Somewhere as small as Long Marston, new homes tend to be conversions, self-builds or a few houses rather than an estate. Each still needs its sealant and floor joints finished properly.
All our work comes with a one-year guarantee.
- Place
- Long Marston (HP23)
- Region
- Hertfordshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
More services for Long Marston
Long Marston: your questions answered
Can you do new build mastic in Long Marston?
Yes. We work across London and the South East, and Long Marston is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
I let a flat near Cheddington station. Can you help?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Where are you based?
We’re a Crawley-based firm. We work across South East England, London and Scotland.
Is it worth resealing while the house is still settling?
That depends on the joint. Failed seals in wet areas need doing now, while small cosmetic gaps can wait a while.
Does someone need to be in?
If the work is inside, we need someone to let us in. Once we have agreed the job, you do not need to watch us work.
How long before the joint can be used?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used.
How much does new build mastic cost in Long Marston?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before any work starts.
Common problems we fix in Long Marston
Once people move in, baths and trays take weight and bed down. If a bath wasn’t filled when it was sealed, the bead is stretched the first time it’s used and the sealant may split.
It’s worth asking for a quote if you see:
- Gaps behind new kitchen upstands
- Shower seals failing in the first year or two
- Plot mastic for developers ahead of handover
- Cracked sealant around new window and door frames
For new homes near Cheddington station, it’s worth checking the sealant early, while snags are still fresh.
Comparing quotes
- What happens if they find a problem under the old sealant
- Who does the work, and how experienced they are
- Whether you can choose the colour
- What the quote includes, VAT included or not
How the job changes by surface
Show homes
We can refresh show-home sealant that has discoloured or been knocked. The old bead comes out and a clean new one goes in.
Bathrooms and en suites
New-build bathrooms and en suites are where sealant fails most often. The old sealant comes out and anti-fungal sanitary silicone goes in after cleaning and priming.
What we can’t put right
We won’t take on work that will not last, so these are the limits:
- Deciding who is responsible under a builder’s warranty
- Structural cracks in walls or ceilings
- Damaged fittings that need replacing
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- Bathrooms & en suites
- Show homes
- Skirting & floors
- Windows & doors
- Plot handovers
- Kitchens
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
How it works
On the day, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. The work normally takes a few hours in a single home. Somewhere as small as Long Marston, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked for movement before we start.
- Old sealant is cut out and the joints cleaned.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- The finished joints are checked and the cure times given.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
- Tell us if parking is tricky
Get a quote
For new build mastic in Long Marston, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
Related advice
Joints and finishes in Long Marston homes
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In and around Long Marston, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Long Marston is about 5 miles east of Aylesbury, in Hertfordshire. From the centre of Long Marston to the outskirts, new build mastic is available for homes and businesses alike. Long Marston is one of 381 towns and villages in Hertfordshire we cover. We also work in Oxford, about 23 miles from Long Marston.
We cover every part of the HP23 postcode area for new build mastic and the streets around it. Local streets include Station Road, Chapel Lane and Bromley, all of which we cover. We also cover Astrope (1 mile south), Puttenham (1 mile south-west), Buckland (2 miles south), Aston Clinton (2 miles south-west) and Wingrave (3 miles north-west). We also work in nearby towns such as Hemel Hempstead (12 miles south-east), Harpenden (15 miles east), Berkhamsted (7 miles south-east), Tring (3 miles south-east), Chorleywood (15 miles south-east) and Grovehill (11 miles south-east).
What’s near Long Marston
Long Marston’s nearest station is Cheddington station, about 2.4 miles north-east of the centre. A little further out are Tindal Centre (4.4 miles west) and Pitstone Green Museum (2.6 miles east). Green spaces nearby include Ivinghoe Beacon and College Lake nature reserve.