Oxfordshire · England
Fernham New Build Mastic
New build mastic in Fernham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints pulling apart as timber shrinks
- New-build shower sealant that has already split
- Untidy sealant flagged on a snagging list
New build mastic in Fernham: local notes
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 Fernham, choosing the right material for each joint is as important as a tidy finish.
Fernham is about 7 miles west of Wantage, in Oxfordshire. Every kind of property in Fernham can book us for new build mastic, old or new, large or small. The work is guaranteed for a year. Fernham is one of 443 places in Oxfordshire we cover. You can also see our page for Oxford, about 17 miles away.
Jobs for new build mastic in SN7 is quoted and booked the same way as anywhere else. That includes homes and businesses on High Street, Church Lane and The Green. We also cover the places around Fernham: Little Coxwell (1 mile north-west), Baulking (2 miles south-east), Uffington (2 miles south-east), Shellingford (2 miles north-east) and Faringdon (2 miles north). Larger places within reach include Didcot (14 miles east), Abingdon-on-Thames (13 miles east), Witney (12 miles north), Carterton (10 miles north), Wantage (7 miles east) and Grove (7 miles east).
Near you in Fernham
Well-known places in the area include Faringdon Castle (2.4 miles north) and Uffington Museum (1.8 miles south). Not far away are Badbury Hill.
How we handle new build mastic in Fernham
Across Fernham, we work for both new-home owners and the builders handing those homes over. One shower or a whole phase of plots, the method does not change: cut out, clean, prime where needed and reseal neatly. We work on kitchens, show homes and bathrooms & en suites, and the jobs we see most are messy sealant that spoils new finishes and cracked sealant around new window and door frames.
Somewhere as small as Fernham, new homes tend to be conversions, self-builds or a few houses rather than an estate. Every one needs its sealant and floor joints done properly, whatever the size of the site.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Where
- Fernham (SN7)
- Region
- Oxfordshire
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Fernham
Also in Fernham
When it is not the sealant
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- Structural cracks in walls or ceilings
- Your warranty claim itself, which is between you and the builder
- Leaking fittings rather than failed sealant
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Plot handovers
- Bathrooms & en suites
- Skirting & floors
- Show homes
- Windows & doors
- Kitchens
Landlords, agents and businesses in Fernham
Letting agents and landlords in Fernham can book us as well as homeowners. Resealing between tenancies keeps a property looking cared for before the next move-in.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
Fernham questions
What guarantee comes with new build mastic in Fernham?
All our work, in Fernham and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Is Fernham in your area for new build mastic?
Yes, Fernham is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
How much does new build mastic cost in Fernham?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Should I wait before resealing?
It depends on whether water is getting through. Failed seals in wet areas need doing now, while small cosmetic gaps can wait a while.
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.
Can new sealant go on top of the old bead?
No. The old sealant is cut out fully, then clean and prime the joint, and a new bead applied.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Leave it or put it right?
Small cosmetic gaps can wait for the house to settle, but water getting through cannot. If you’re unsure which you have, phone 0345 464 0079 or drop us an email with photos and we’ll give you a straight answer. In a small place like Fernham, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
What you get with us
- Any old sealant cut out fully, not covered over
- Sanitary silicone with an anti-fungal additive in wet areas
- We leave the area clean and tidy
- 4.9 on Google from 180+ five-star reviews
Take a look at how sealant jobs are priced and our reviews.
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Avoid scourers and strong chemicals on sealant
- Look at the sealant regularly in the first couple of years
- Wait for the cure time before using a resealed shower
- Use the extractor fan every time you shower
Wipe the sealant with warm soapy water. Keep scourers and harsh chemicals off it.
Early snagging is easier snagging. Left alone, a small crack can become a leak over time.
How the visit works
We keep the work tidy and contained to the area we’re working on, so you can carry on as normal. The job normally takes a few hours for most snagging lists, longer for a run of plots, and we explain the cure time before we leave. In a small place like Fernham, 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 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
- For indoor joints, keep the area dry beforehand if you can
- Mention any parking rules near the property
- Mention any sign-in or site rules at work premises
Getting a quote
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand.
Related advice
Signs you need new build mastic in Fernham
Once people move in, baths and trays take weight and bed down. A bath sealed empty drops slightly when filled, straining the joint and the sealant may split.
Keep an eye out for these signs:
- Sealant applied over dusty or wet surfaces
- Cracks appearing as a new home settles
- Sealant work across a run of new homes
- Kitchen sealant that has pulled off the wall
In and around Fernham, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
What your quote should include
- How much experience the applicator has
- What the quote includes, VAT included or not
- How the surfaces are prepared before sealing
- What product goes in the joint