Buckinghamshire · England
Thornborough New Build Mastic
New build mastic across Thornborough and nearby, with old sealant always removed completely and a 12-month guarantee.
- Plot mastic for developers ahead of handover
- Messy sealant that spoils new finishes
- Sealant that never bonded to the surface
Why it’s worth doing now in Thornborough
The builder is usually the first port of call while the snagging or warranty period runs. If it keeps failing or is not dealt with, we can reseal it properly. Around Thornborough, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
What you pay reflects the work, not guesswork. That is why we ask a few questions first and give you a clear price before work begins.
Why book with us
- Homes, businesses and hotels
- ARBOMaster approved applicator
- Arbo and Everbuild products
- Fully insured
Read our cost guide and our reviews.
New build mastic in Thornborough, done properly
We work in new homes and on new-build sites across Thornborough. One shower or a whole phase of plots, the method does not change: remove, clean, prime where needed, then a neat new bead. We’re often asked to deal with gaps between new skirting and floors and cracks appearing as a new home settles, across skirting & floors, bathrooms & en suites and kitchens.
Around Thornborough, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
Our work is backed for twelve months, in Thornborough and everywhere else we cover.
- Location
- Thornborough (MK18)
- Region
- Buckinghamshire
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Also near Thornborough
Other services in Thornborough
Different surfaces, different methods
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. We reseal it with a weatherproof, flexible sealant.
Skirting and floors
Gaps under skirting are one of the most common new-build snags. A flexible sealant closes it without cracking like caulk.
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Get a leaking seal dealt with straight away
- Record problems with dated photos
- Don’t seal over failed sealant yourself
- Clean sealant with mild detergent, not abrasives
Avoid standing on the rim of the bath or the edge of the tray in the first few weeks. If a bath or tray moves when you stand in it, get it looked at.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Left alone, a small crack can become a leak over time.
How it works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours for most snagging lists, longer for a run of plots. In a small place like Thornborough, access is generally the main thing to plan. 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.
- Each area is checked and left with its cure time.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Tell us about any previous sealing or DIY attempts
- Clear the area around the work
Ask for a quote
If you’re in Thornborough and need new build mastic, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
Advice
Can I do it myself?
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. 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.
Landlords, agents and businesses in Thornborough
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Your questions about new build mastic in Thornborough
Is new build mastic in Thornborough guaranteed?
Every job comes with our one-year guarantee, wherever it is. We’re fully insured, and an ARBOMaster approved applicator.
Is Thornborough in your area for new build mastic?
Yes. Our work covers London and the South East, and Thornborough is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Can you reseal over the builder’s sealant?
No. The old sealant is cut out fully, then clean and prime the joint, and a new bead applied.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Where are you based?
We are based in Crawley, and we work across South East England, London and Scotland.
What do you need from me for a quote?
Tell us what needs doing and where, plus photos if you have them. If we need more, we will ask.
Signs you need new build mastic in Thornborough
Later trades and the final clean can damage fresh sealant. If it’s disturbed before curing, the joint can be left weak.
Look out for any of the following:
- Cracks appearing as a new home settles
- Sealant work across a run of new homes
- Shower seals failing in the first year or two
- Beads laid onto grit and dust from the build
Around Thornborough, as everywhere, new build mastic is only as good as the preparation behind it.
What your quote should include
- How long the guarantee is
- What happens if they find a problem under the old sealant
- Who turns up on the day
- How the surfaces are prepared before sealing
What new build mastic looks like in Thornborough
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.
For jobs in and around Thornborough, choosing the right material for each joint is as important as a tidy finish.
Thornborough is about 3 miles east of Buckingham, in Buckinghamshire. Every kind of property in Thornborough is covered for new build mastic, old or new, large or small. The work is guaranteed for a year. Thornborough is one of 263 places in Buckinghamshire we cover. We also work in Oxford, around 22 miles away.
Every address in MK18 is covered for new build mastic. We cover properties on High Street, Chapel Lane and The Green. Close by, we work in Adstock (2 miles south), Padbury (2 miles south-west), Buckingham (3 miles west), Steeple Claydon (5 miles south-west) and East Claydon (5 miles south). We also work in nearby towns such as Aylesbury (13 miles south), Elmhurst (13 miles south), Southcourt (14 miles south), Haydon Hill (12 miles south), Turnfurlong (14 miles south) and Quarrendon Estate (12 miles south).
Near you in Thornborough
Other landmarks nearby include Buckingham Castle (3.1 miles west) and Buckingham Movie Museum (3 miles west). Not far away are Buckingham Sand Pit.