Oxfordshire · England
Postcombe New Build Mastic
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Postcombe. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps between new skirting and floors
- New-build shower sealant that has already split
- Cracks appearing as a new home settles
New build mastic for homes and businesses in Postcombe
A new house keeps drying out and settling for its first couple of years. Timber shrinks, plaster dries and baths and trays bed down, and sealant applied in a hurry at handover can split. We work on show homes, kitchens and windows & doors, and people most often call us about shower seals failing in the first year or two and internal frame sealant that has split.
For a small place like Postcombe, the journey and access are planned in advance, and once on site, the job is the same as anywhere.
Each job carries a 12-month guarantee, whatever its size.
- Place
- Postcombe (OX9)
- Region
- Oxfordshire
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What new build mastic looks like in Postcombe
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.
For jobs in and around Postcombe, choosing the right material for each joint is as important as a tidy finish. In and around Postcombe, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Postcombe is about 4 miles south of Thame, in Oxfordshire. Homes, rented property, offices and hotels in Postcombe is covered for new build mastic. Every job comes with our 12-month guarantee. Our Oxfordshire coverage runs to 443 places, Postcombe among them. We also work in Oxford, about 12 miles from Postcombe.
Work in OX9 works the same way as everywhere else we cover. Whether your property is on London Road, Salt Lane and Beech Farm Close or anywhere close by, our applicators can take on the job. Neighbouring places we cover for new build mastic include South Weston (1 mile south-west), Aston Rowant (1 mile east), Lewknor (1 mile south), Kingston Blount (2 miles east) and Crowell (2 miles east). Larger places within reach include Oxford (12 miles west), Didcot (13 miles south-west), Abingdon-on-Thames (13 miles west), Thame (4 miles north), Henley-on-Thames (11 miles south) and Benson (7 miles south-west).
Near you in Postcombe
In Postcombe, that means homes and buildings near England's Rose pub. Nearby you will also find Thame Community Hospital (3.8 miles north). Open spaces near Postcombe include Aston Rowant NNR and Bald Hill.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Don’t wait for the house to settle if water is getting through
- Wipe joints with warm soapy water
- Keep water off fresh sealant until it has cured
- Avoid running a DIY bead over the old one
Follow the cure time we give you before the area gets wet. Silicone is normally left for about a day.
Lifting sealant traps moisture and mould behind it. Dealing with it before it goes black saves a harder job later.
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
What affects the cost of new build mastic
Every job gets its own quote. These are the things that affect it:
- Mould in or behind the old joints
- The size of the job
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- What’s wrong with the joints now
- Whether it’s a home or a business
- If someone has resealed it before
- Where the job is, and your postcode
For new build mastic in Postcombe, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and you’ll get a clear quote before any work starts.
How the job changes by surface
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. We cut out the failed bead, clean and prime, and reseal with anti-fungal sanitary silicone.
Plot handovers
We work through plots to your schedule, sealing each room ready for handover. Each joint is cleaned and primed where needed.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Also near Postcombe
More services for Postcombe
Why it’s worth doing now in Postcombe
A quick bead over the top of the old sealant can look fine at first, but it can’t bond to what’s underneath. A lasting seal starts with removing the old one completely. In a small place like Postcombe, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
The cost depends on the amount of work, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why Postcombe clients choose us
- Full insurance on every job
- White, clear, grey or coloured to suit, where the product allows
- Any old sealant cut out fully, not covered over
- You choose the colour before work begins
See our cost guide and our reviews.
What happens on the day
The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take anything from a few hours to several days, depending on the number of plots, and we explain the cure time before we leave. Somewhere as small as Postcombe, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at why each joint failed, including any movement.
- We remove the failed sealant and clean the joints.
- Joints are dried and primed where the product calls for it.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
Before we arrive
- Tell us about any water getting in
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work and give you a clear quote.
Related advice
Questions from Postcombe
Will you come out to Postcombe?
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 new build mastic in Postcombe guaranteed?
All our work, in Postcombe and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you when we finish.
Is it worth resealing while the house is still settling?
Where water is getting through, don’t wait. Small gaps that are just cosmetic can be resealed once movement has slowed.
How long does the job take?
Most jobs take anything from a few hours to several days, depending on the number of plots, including preparation and clearing up. We will confirm how long when we quote.
Is it worth trying it myself?
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.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area.
What does new build mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote.