Oxfordshire · England
New-build mastic & snagging in Middle Assendon, Oxfordshire
New build mastic across Middle Assendon and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Cracks appearing as a new home settles
- Cracked sealant around new window and door frames
- Plot mastic for developers ahead of handover
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Clean sealant with mild detergent, not abrasives
- Put sealant faults on your snagging list early
- Watch for new gaps as the house dries out
- Don’t wait for the house to settle if water is getting through
Avoid standing on the rim of the bath or the edge of the tray while the sealant cures. If a bath or tray moves when you stand in it, get it looked at.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Catching it early keeps the fix to the sealant.
New build mastic in Middle Assendon
In a new home, every joint should have a clean, even bead. Smeared, patchy or cracked sealant is worth sorting early, before water reaches anything behind it. We work on skirting & floors, kitchens and windows & doors, and people most often call us about worktop and upstand sealant coming away and plot mastic for developers ahead of handover.
Around Middle Assendon, 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.
- Location
- Middle Assendon (RG9)
- Wider area
- Oxfordshire
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Middle Assendon
Other services in Middle Assendon
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Cracking that points to a structural problem
- Baths and trays that move too much for sealant to cope with
- Leaks from pipes, valves or wastes, which need a plumber
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer before booking.
Joints and surfaces we work on
- Plot handovers
- Bathrooms & en suites
- Kitchens
- Show homes
- Skirting & floors
- Windows & doors
Signs you need new build mastic in Middle Assendon
Sealant is often one of the last jobs before handover. Dusty, unprimed joints are common, and the sealant sits on grit instead of the surface.
Look out for any of the following:
- Gaps opening as the house dries out and settles
- Messy sealant that spoils new finishes
- Shower seals failing in the first year or two
- Frame joints opening as the plaster dries
For new homes near Henley-On-Thames station, it’s worth checking the sealant early, while snags are still fresh.
What to look for in a quote
- When the joint can take water or movement
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
- Is the old sealant removed completely?
How the job changes by surface
Plot handovers
Taking time over preparation reduces return visits. We clean out building dust before sealing and prime where the product needs it.
Kitchens
Beside the sink, the joint takes water every day. A kitchen sealant goes in there suited to the job.
Questions from Middle Assendon
Is Middle Assendon in your area for new build mastic?
Yes, Middle Assendon is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to Middle Assendon?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you use white or clear sealant?
It depends on the joint: white or clear for most sanitary joints, colours for worktops, floors and frames. We’ll agree it with you first.
Are you fully insured?
Yes. We are fully insured, and we’ve been doing sealant work for more than 20 years.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Can you reseal over the builder’s sealant?
No. Fresh silicone doesn’t stick to the old layer, so it soon lifts and traps water. The old sealant always comes out first.
When is the best time to reseal in a new build?
Any seal that’s leaking should be redone right away. For small cosmetic gaps, waiting until the house has settled can save doing them twice.
How long does the job take?
Most jobs take a few hours for most snagging lists, longer for a run of plots, including the preparation. We will confirm how long when we quote.
The process
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. Most jobs take a few hours in a single home. For a village or hamlet like Middle Assendon, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We go through the snagging list or plot schedule and agree the joints to do.
- Failed or untidy sealant is cut out completely.
- We clean off dust from the build and prime the surfaces where the product needs it.
- New sealant suited to each joint is applied and tooled neatly.
- We check every joint and tell you how long each needs to cure.
Preparing for the visit
- Move anything stored near the joints
- Tell us if parking is tricky
- Mention if the joints have been sealed before
Ask for a quote
For a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
Related advice
New homes and floors in Middle Assendon
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Around Middle Assendon, as everywhere, new build mastic is only as good as the preparation behind it.
Middle Assendon is about 6 miles north of Caversham, in Oxfordshire. Wherever you are in the RG9 postcode area, we cover new build mastic for homes and businesses. Middle Assendon is one of 443 places in Oxfordshire we cover. You can also see our page for Reading, roughly 8 miles from Middle Assendon.
Our applicators cover all of RG9 for new build mastic. Streets in the area include Fawley Bottom Lane and White Lane, and we cover them all. Neighbouring places we cover for new build mastic include Bix (1 mile south-west), Fawley Bottom (1 mile north-east), Lower Assendon (1 mile south-east), Fawley (1 mile east) and Catslip (2 miles west). Further out, we also cover Didcot (14 miles west), Thame (12 miles north), Henley-on-Thames (3 miles south-east), Benson (8 miles north-west), Chinnor (9 miles north) and Tilehurst (9 miles south-west).
Near you in Middle Assendon
In Middle Assendon, that means homes and buildings near Fawley Court and Temple Island and Rainbow Inn, among other places. Middle Assendon’s nearest station is Henley-On-Thames station, roughly 2.7 miles south-east of the centre. Other landmarks nearby include Frazer Nash Archives (3.1 miles south-east). The countryside around Middle Assendon includes Warburg Nature Reserve.
For landlords and businesses
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.