Wokingham · England
New-build mastic & snagging in California, Wokingham
New build mastic for California, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Second-fix sealing on new plots
- Sealant that never bonded to the surface
- New-build shower sealant that has already split
New build mastic for homes and businesses in California
We never seal over a failed new-build bead. New silicone won’t bond to old silicone, so the joint is cut out, cleaned, dried and resealed. We are often asked to deal with second-fix sealing on new plots and shower seals failing in the first year or two, across kitchens, plot handovers and bathrooms & en suites.
Around California, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
Whatever the size of the job, you get the same one-year guarantee in California and across Wokingham.
- Place
- California (RG40)
- Wider area
- Wokingham
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before any work begins. The work generally takes a few hours in a single home. In a small place like California, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out down to clean surfaces.
- Joints are vacuumed and cleaned of building dust.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
Preparing for the visit
- Tell us if parking is tricky
- Mention any tricky access
- Tell us about any water getting in
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or email us.
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How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Wait for the cure time before using a resealed shower
- Clean sealant with mild detergent, not abrasives
- Get a leaking seal dealt with straight away
- Open a window or run the fan after bathing
Wipe the sealant with warm soapy water. Keep scourers and harsh chemicals off it.
If a shower tray or bath seal splits in the first year, look for movement. Have it resealed, and the tray or bath checked, before it gets worse.
Why it’s worth doing now in California
A quick bead over the top of the old sealant can look fine at first, but it cannot bond to what’s underneath. A lasting seal starts with removing the old one completely. Around California, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why choose Mr Mastic in California
- 4.9 on Google from 180+ five-star reviews
- We never seal over old sealant
- A sealant colour to suit the surroundings
- Anti-fungal silicone where joints get wet
Take a look at what affects the cost or our reviews.
New build mastic in California: local notes
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 California, as everywhere, new build mastic is only as good as the preparation behind it. If you’ve bought a new home near Crowthorne station, the sealant around baths, showers and frames is worth checking in the first year or two.
California is about 3 miles south-west of Wokingham, in Wokingham. Whether you’re in the middle of California or further out, we cover new build mastic for every kind of property. Across Wokingham, we cover 35 places, and California is one of them. Reading is on our list too, around 7 miles away.
Here we cover the RG40 postcode area for new build mastic. If you need new build mastic at a property on Warren Lane, White Horse Lane and Fernbank or anywhere close by, we can help. If you’re just outside California, we cover Arborfield Garrison (1 mile west), Finchampstead (1 mile south-east), Barkham (1 mile north), Langley Common (1 mile north-west) and Eversley (1 mile south-west). Within a short drive, we also cover Reading (7 miles north-west), Wokingham (3 miles north-east), Woodley (5 miles north), Earley (5 miles north-west), Crowthorne (3 miles east) and Lower Earley (4 miles north-west).
Near you in California
Around California, our work takes us to homes and buildings near The Queen's Oak pub, Bohunt School Wokingham and Shepperlands Farm Nature Reserve and the streets around them. California’s nearest station is Crowthorne station, about 2.4 miles east of the centre. Well-known places in the area include Beaumys Castle (4.7 miles west) and Wokingham Hospital (2.6 miles north-east). Not far away are Horseshoe Lake and Holt Copse & Joel Park.
When it isn’t the sealant
Before booking, it’s worth knowing the limits too:
- Baths and trays that move too much for sealant to cope with
- Deciding who is responsible under a builder’s warranty
- Settlement cracks that need a surveyor
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
What we seal
- Skirting & floors
- Bathrooms & en suites
- Show homes
- Windows & doors
- Kitchens
- Plot handovers
What the job involves on each surface
Bathrooms and en suites
En suite seals are easy to miss on a snagging list until they leak. Resealing properly keeps water where it belongs.
Show homes
Tired or marked sealant in a show home can be renewed. We cut it out and reseal neatly.
Towns and villages near California
More services for California
DIY sealant or a professional job?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
What affects the cost of new build mastic
We quote each job individually. These are the things that affect it:
- How many areas need sealing
- The old material and how stubborn it is
- Access and height
- Which sealant suits the joint
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Ask us for a quote and we will go through it with you.
What we need to know
Before you ask for a quote, have a think about:
- Any access issues, like height or stairs
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
There’s no standard price list. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or email us.
California questions
Do you cover California for new build mastic?
Yes, California is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Will you come out to California?
Yes. California is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Who should fix failed sealant in a new build?
Your builder, if you are still in their snagging or warranty period. After that, or if their repair keeps failing, we can do it.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover California.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Can you reseal over the builder’s sealant?
No. The old sealant is cut out fully, the joint cleaned and primed where needed, before resealing.
Can you quote for more than one area?
Yes. Several rooms, windows or areas can go on one quote.