Oxfordshire · England
New Marston New Build Mastic
New build mastic for New Marston, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Leaking shower tray seals in a new home
- Gaps behind new kitchen upstands
- Gaps between new skirting and floors
Aftercare tips
Good habits help new joints last longer. A few tips:
- Keep water off fresh sealant until it has cured
- Avoid running a DIY bead over the old one
- Clean sealant with mild detergent, not abrasives
- Record problems with dated photos
Watch the joints as the house settles. Small gaps can appear as the house dries and can be resealed later.
A seal that splits early is often a sign of movement. Have it resealed, and the tray or bath checked, before it gets worse.
New build mastic in New Marston
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. If you have messy sealant that spoils new finishes and second-fix sealing on new plots, we can help.
Where new homes go up in smaller places like New Marston, it’s often a small development or a single plot. The sealant around baths, showers, frames and skirtings needs to be right from the start.
We stand behind the work with a 12-month guarantee.
- Location
- New Marston (OX3, OX1, OX4)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
New homes and floors in New Marston
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In and around New Marston, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
New Marston is about 1 mile north of Oxford, in Oxfordshire. Jobs in New Marston get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. New Marston is one of 443 places in Oxfordshire we cover for new build mastic.
All of OX3, OX1 and OX4 is covered for new build mastic, from the main roads to the quietest streets. Local streets include Ferry Road, Croft Road and Copse Lane. Close by, we work in Headington Hill (1 mile south-east), Northway (1 mile north-east), Oxford (1 mile south), St Clement's (1 mile south) and Norham Manor (1 mile west). We also work in nearby towns such as Didcot (11 miles south), Bicester (10 miles north), Abingdon-on-Thames (6 miles south), Witney (11 miles west), Carterton (15 miles west) and Thame (11 miles east).
Local landmarks in New Marston
Typical jobs here are in homes near English Faculty Library, Cheney School and Headington Hill Park, among other places. Nearby too are Rye St Antony School (0.5 miles south-east) and White Horse pub (0.8 miles south-east). The nearest railway station is Oxford station, roughly 1.6 miles south-west of the centre. Other landmarks nearby include Clarendon Shopping Centre (1.2 miles south-west) and Churchill Hospital (0.7 miles east). Open spaces near New Marston include Headington Hill and CS Lewis Nature Reserve.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
What happens if it’s left?
A failed shower or bath seal in a new home lets water into floors and walls that are still drying out. Dealing with it early keeps the damage away from ceilings, floors and finishes. Homes in smaller places like New Marston can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why book with us
- A choice of colours where the product allows
- We agree the colour with you first
- 20+ years of sealant experience
- Rated 4.9 stars on Google
Take a look at what affects the cost or customer reviews.
Do you need new build mastic in New Marston?
A new house holds a lot of water from the build, which takes a year or two to dry out. Drying timber shrinks and pulls joints apart, and sealant that cannot keep up splits.
The problems people generally mention when they call include:
- Messy sealant that spoils new finishes
- Gaps opening as the house dries out and settles
- Frame joints opening as the plaster dries
- Leaking shower tray seals in a new home
If you’ve bought a new home near Oxford station, the sealant around baths, showers and frames is worth checking in the first year or two.
Comparing quotes
- Whether you can choose the colour
- Whether all the old sealant comes out first
- What insurance they hold
- Whether the sealant suits the joint
Nearby places to New Marston
More services for New Marston
Questions from New Marston
Can you help a landlord with a rental near Oxford station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Do you cover New Marston for new build mastic?
Yes. We work across London and the South East, and New Marston is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll send you a clear quote.
How long should I leave it?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
Why does sealant fail so quickly in new builds?
A new house dries and settles for a year or two, and sealant is often applied quickly onto dusty surfaces. Both lead to early failure.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
When is the best time to reseal in a new build?
Where water is getting through, don’t wait. Hairline cosmetic gaps can wait until the house has settled.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
Do you have insurance?
Yes. We are fully insured for every job we do.
When something else is needed
In fairness, some problems need a different trade:
- Broken tiles or a split tray
- Disputes or warranty claims with your builder
- A tray or bath that is not properly supported, until it’s fixed
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
What we seal
- Show homes
- Kitchens
- Windows & doors
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
The process
There’s no need to move everything out before we come, only the area right around the joints. Everything nearby is protected, and the job takes a few hours in a single home in most cases. A visit to New Marston is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely, with no layer left behind.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
How to prepare
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
- Tell us about any previous sealing or DIY attempts
Ask for a quote
To get a quote, call 0345 464 0079 or drop us an email with the location and a short description of the problem. We will give you a clear price before any work starts.
Related advice
For landlords and businesses
For anyone letting property in or around New Marston, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.