Oxfordshire · England
New Build Mastic in Kencot
New build mastic across Kencot and nearby, with old sealant always removed completely and a one-year guarantee.
- Sealant that never bonded to the surface
- Gaps behind new kitchen upstands
- Untidy sealant flagged on a snagging list
New build mastic in Kencot, done properly
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 since hurried prep is behind a lot of new-build failures. We work on bathrooms & en suites, skirting & floors and plot handovers, and the jobs we see most are untidy sealant flagged on a snagging list and frame joints opening as the plaster dries.
Around Kencot, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
Big or small, it’s backed by our 12-month guarantee.
- Location
- Kencot (OX18)
- Wider area
- Oxfordshire
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Also in Kencot
Different surfaces, different methods
Bathrooms and en suites
En suite showers are a common source of leaks into the room below. A proper reseal keeps water in the tray.
Windows and doors
On new builds, external frame sealant can be patchy. It’s resealed with an exterior sealant suited to the frame and wall.
New build mastic around Kencot
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Around Kencot, as everywhere, new build mastic is only as good as the preparation behind it. For jobs in and around Kencot, choosing the right material for each joint is as important as a tidy finish.
Kencot is about 2 miles south-west of Carterton, in Oxfordshire. From the centre of Kencot to the outskirts, new build mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Oxfordshire, we cover 443 places, and Kencot is one of them. For nearby work, see our Oxford page (16 miles or so).
Every address in OX18 is within our area for new build mastic. We also cover the places around Kencot: Alvescot (1 mile south-east), Shilton (2 miles north) and Bradwell (3 miles north-west). Within a short drive, we also cover Abingdon-on-Thames (15 miles east), Witney (6 miles north-east), Wantage (13 miles south-east), Grove (12 miles south-east), Faringdon (6 miles south) and Kidlington (15 miles east).
Local landmarks in Kencot
Locally, jobs take us to homes and businesses close to The Plough pub and Carterton Community College, among other places. Well-known places in the area include Swinford Museum (1.9 miles west) and Longworth Hospital (5.9 miles south).
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours in a single home and we leave things clean and tidy. For a village or hamlet like Kencot, the journey is planned in advance: let us know about lanes, gates and parking. 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, with no layer left behind.
- Joints are vacuumed and cleaned of building dust.
- We prime where needed and apply a sealant suited to each joint.
- We tool every joint neatly and tell you when each area can be used.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
- Let us know about stairs, lifts or work at height
Get a quote
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and give you a clear price before work begins.
Advice
When it is not the sealant
We’ll always be straight with you, so here’s what new sealant will not do:
- Damaged fittings that need replacing
- Leaks from pipes, valves or wastes, which need a plumber
- Deciding who is responsible under a builder’s warranty
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Where we work in Kencot
- Skirting & floors
- Kitchens
- Bathrooms & en suites
- Show homes
- Windows & doors
- Plot handovers
Why act early in Kencot
A quick bead over the top of the old sealant can look fine at first, but it can’t bond to what’s underneath. Taking it all out and starting again is the only way to get a lasting seal. Where a wall is exposed, as many are in small places like Kencot, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
What you get with us
- 4.9 on Google from 180+ five-star reviews
- A sealant colour to suit the surroundings
- 12-month guarantee on every job
- An ARBOMaster approved applicator
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Avoid running a DIY bead over the old one
- Wipe joints with warm soapy water
- Check bath and shower seals every few months as the house settles
- Get a leaking seal dealt with straight away
Clean the sealant with a mild detergent and a soft cloth. Avoid abrasive pads and strong solvents.
Mould takes hold quickly in sealant that has gaps or lifted edges. Dealing with it before it goes black keeps the job straightforward.
FAQs for Kencot
What guarantee comes with new build mastic in Kencot?
All our work, in Kencot and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Do you cover Kencot for new build mastic?
Yes. Our work covers London and the South East, and Kencot is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will send you a clear quote.
Can you match the sealant colour to my new kitchen or bathroom?
The colour is chosen to suit the tiles, worktop or frame. Let us know your preference when you ask for a quote.
Where is Mr Mastic based?
We work from Crawley. We cover Kencot and the rest of Oxfordshire.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
How long does new build mastic take?
That depends on how much there is to do, but as a guide it takes a few hours in a single home. We’ll give you a better idea when we quote.
Should I go to my builder first?
Start with your builder while their snagging or warranty period runs. After that, or if their repair keeps failing, we can do it with our one-year guarantee.
Can you work from my snagging list?
Yes. Photos of each sealant item help us quote. If something isn’t sealant, we’ll say so.
For landlords and businesses
We also work for property managers and facilities teams. We can quote a run of properties together.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.