West Berkshire · England
New Build Mastic in Three Mile Cross
Plot mastic for developers and snagging failed sealant in new homes for householders, landlords and businesses in Three Mile Cross. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Untidy sealant flagged on a snagging list
- New-build shower sealant that has already split
- Cracked sealant around new window and door frames
What the job involves on each surface
Bathrooms and en suites
New-build bathrooms and en suites are where sealant fails most often. The old sealant comes out and anti-fungal sanitary silicone goes in after cleaning and priming.
Plot handovers
Send us the schedule and any sealant specification and we’ll quote. Sealant work across the plot is covered.
About our new build mastic in Three Mile Cross
A new house keeps drying out and settling for its first couple of years. Timber shrinks, plaster dries and baths and trays bed down, so sealant that was laid quickly before handover often cracks. We are often asked to deal with plot mastic for developers ahead of handover and gaps behind new kitchen upstands, on kitchens, plot handovers and show homes.
Older homes in small places like Three Mile Cross often have timber floors that move with the seasons, which is why skirting and threshold joints need a flexible sealant, not filler.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Location
- Three Mile Cross (RG7)
- Wider area
- West Berkshire
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Do you need new build mastic in Three Mile Cross?
On many sites, sealant goes on in the final rush before handover. Joints are not always cleaned of dust or primed, and the sealant sits on grit instead of the surface.
People generally contact us after spotting one of these:
- Gaps behind new kitchen upstands
- Untidy sealant flagged on a snagging list
- Cracked caulk along new skirting
- Cracked sealant around new window and door frames
For new homes near Reading Green Park station, it’s worth checking the sealant early, while snags are still fresh.
What your quote should include
- Whether all the old sealant comes out first
- What the cure time is
- Are they insured?
- What happens if the job turns out different
What affects the cost of new build mastic
For a quick quote, just ask. The main things that affect it are:
- The product the joint needs
- Mould in or behind the old joints
- The number of rooms or windows
- Whether the work is at height
The cost depends on the size of the job, how much old material has to come out and access to the work. You will have a clear quote before any work starts.
Asking for a quote
To make quoting easier, let us know:
- How we’d reach the joints
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- Pictures of the joints, sent by email
We do not publish a price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or email us.
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Wait for the cure time before using a resealed shower
- Resist patching a failed seal with a tube from the DIY shop
- Clean sealant with mild detergent, not abrasives
- Do not wait for the house to settle if water is getting through
Photograph failed sealant before it’s redone and keep the builder’s replies. It’s useful if you need to raise other issues later.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Early resealing keeps the job small and the new finishes intact.
Also near Three Mile Cross
What else we do in Three Mile Cross
What we do, step by step
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours in a single home. For a village or hamlet like Three Mile Cross, 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 go through the snagging list or plot schedule and agree the joints to do.
- The old bead comes out in full, with no layer left behind.
- Surfaces are cleaned of building dust and primed where needed.
- We apply a sealant that suits each joint and tool it to a neat finish.
- We check every joint and tell you how long each needs to cure.
Preparing for the visit
- Move anything stored near the joints
- Keep children and pets away from the work area
- Tell us if parking is tricky
Get a quote
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job, and photos are welcome.
Read more
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
New homes and floors in Three Mile Cross
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
In and around Three Mile Cross, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Three Mile Cross is about 3 miles south of Reading, in West Berkshire. We provide new build mastic to householders, landlords and businesses in Three Mile Cross and the surrounding area, as part of our work across West Berkshire. Our area takes in 155 places across West Berkshire.
We cover every part of the RG7 postcode area for new build mastic and the streets around it. That includes homes and businesses on Dairy Grove, Basingstoke Road and Buttermilk Grove. If you’re just outside Three Mile Cross, we cover Ryeish Green (1 mile south-east), Great Lea Common (1 mile north-west), Whitley Wood (1 mile north-east), Shinfield (1 mile east) and Green Park (2 miles north-west). We also work in nearby towns such as Newbury (15 miles west), Thatcham (12 miles west), Burghfield Common (4 miles west), Speenhamland (15 miles west), Calcot (4 miles north-west) and Shaw (15 miles west).
What’s near Three Mile Cross
We work in homes and buildings around The Farriers Arms, Pearman's Copse and Ryeish Green School. The closest station to Three Mile Cross is Reading Green Park station, about 2 miles north-west of the centre. Well-known places in the area include Beaumys Castle (2.1 miles south) and The Oracle (3.3 miles north). For a walk, there’s Longwater and Fobney Island Wetland Reserve.
Your questions about new build mastic in Three Mile Cross
Will you come out to Three Mile Cross?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Three Mile Cross for new build mastic?
Yes. We work across London and the South East, and Three Mile Cross is part of that. You can phone 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Do you take on second-fix sealing for builders?
Yes. We carry out plot mastic and second-fix sealing for builders and developers. Send us the plot schedule and we’ll quote.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Where is Mr Mastic based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
How much does new build mastic cost in Three Mile Cross?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
Can I do it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
What do you need from me for a quote?
Only a few details: where it is, what you’ve noticed and how we reach it. After that, simply phone 0345 464 0079 or email us.
What sealant work can’t fix
We will always be straight with you, so here’s what sealant can’t fix:
- A tray or bath that is not properly supported, until it’s fixed
- Your warranty claim itself, which is between you and the builder
- Settlement cracks that need a surveyor
If you are not sure, just phone 0345 464 0079 or drop us an email and we will give you a straight answer.
Surfaces we seal
- Bathrooms & en suites
- Skirting & floors
- Plot handovers
- Windows & doors
- Show homes
- Kitchens