Hampshire · England
New-build mastic & snagging in South Wonston, Hampshire
We cover South Wonston for plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly.
- Kitchen sealant that has pulled off the wall
- Sealant that never bonded to the surface
- Joints pulling apart as timber shrinks
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
How we handle new build mastic in South Wonston
New homes move as they dry out. Timber dries and shrinks, and baths and trays settle, and sealant applied in a hurry at handover can split. If you have shower seals failing in the first year or two and second-fix sealing on new plots, we can put it right, whatever the surface.
Around South Wonston, older homes often have timber floors that move through the year, so skirting and threshold joints need a flexible sealant rather than a rigid filler.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Place
- South Wonston (SO21)
- Wider area
- Hampshire
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for new build mastic in South Wonston
Every job gets its own quote. This is what makes a difference:
- The product the joint needs
- The size of the job
- The old material and how stubborn it is
- Whether the work is at height
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
What to tell us when you ask for a quote:
- The address or postcode of the job
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
- Whether it’s a home or a business
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, phone 0345 464 0079 or email us.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Put sealant faults on your snagging list early
- Wipe joints with warm soapy water
- Ventilate bathrooms well, especially in the first year
- Avoid running a DIY bead over the old one
Ventilation matters in a new home, which is still drying out. Use the extractor fan or open a window after showers to help keep mould away.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Left alone, a small crack can become a leak.
Also near South Wonston
More services for South Wonston
Why deal with it now?
DIY kits don’t solve the main problems with new-build sealant: grit, unprimed surfaces and old layers underneath. Proper removal and preparation are what make it last. Older cottages and farmhouses around South Wonston can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Why choose Mr Mastic in South Wonston
- 4.9 on Google from 180+ five-star reviews
- Fully insured
- Arbo and Everbuild products
- White, clear, grey or coloured to suit, where the product allows
Take a look at what affects the cost or customer reviews.
New build mastic around South Wonston
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In and around South Wonston, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint. For new homes near Winchester station, it’s worth checking the sealant early, while snags are still fresh.
South Wonston is about 4 miles north of Winchester, in Hampshire. We provide new build mastic to homes and businesses in South Wonston and nearby. We cover 683 towns and villages across Hampshire, from the larger towns to small villages. Southampton is on our list too, around 14 miles away.
Every address in SO21 is covered for new build mastic. Streets in the area include Norris Gardens, Wrights Way and Lovell Close, all of which we cover. If you’re just outside South Wonston, we cover Worthy Down (1 mile south), Springvale (2 miles south-east), Sutton Scotney (2 miles north), Stoke Charity (2 miles north-east) and Hunton (3 miles north). Within a short drive, we also cover Basingstoke (14 miles north-east), Winchester (4 miles south), Eastleigh (11 miles south), Andover (9 miles north-west), Chandler's Ford (10 miles south) and Alton (15 miles east).
Landmarks near South Wonston
For rail, the closest station is Winchester station, roughly 3.7 miles south. Other landmarks nearby include Royal Hampshire County Hospital (4 miles south) and Winchester Castle (4.1 miles south). Not far away are Winnall Moors.
How it works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take a few hours for most snagging lists, longer for a run of plots. Somewhere like South Wonston needs a little journey planning: 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.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- The failed sealant is removed completely.
- 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.
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 access, such as stairs, a lift or high-level joints
How to get a quote
Getting a quote is simple: tell us what needs doing and where. A few photos by email make the job easier to understand, and we will take it from there.
Advice
South Wonston: your questions answered
Can you help a landlord with a rental near Winchester station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
Can you do new build mastic in South Wonston?
Yes, South Wonston is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear quote.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and you will get one quote.
Can new sealant go on top of the old bead?
No. The old sealant is cut out fully, then clean and prime the joint, before resealing.
Where are you based?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
What should I tell you?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply call 0345 464 0079 or drop us an email.
Is there any odour?
There can be a smell while the sealant cures, but it fades. Ventilation helps.
Do you guarantee your work?
Yes. All our work carries a one-year guarantee.
What the job involves on each surface
Plot handovers
Good preparation at handover saves snagging later. Dust from the build is removed first and prime where the product needs it.
Show homes
Show homes need sealant that looks right from day one. We lay neat, even beads in colours to suit the finishes.
Honest limits
New sealant cannot fix everything, and we’ll tell you before we start. Sealant will not put right:
- Plumbing faults behind the sealant
- Your warranty claim itself, which is between you and the builder
- Cracked trays, tiles or worktops
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Where we work in South Wonston
- Windows & doors
- Skirting & floors
- Show homes
- Plot handovers
- Kitchens
- Bathrooms & en suites