Hampshire · England
St Cross New Build Mastic
New build mastic for St Cross and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Cracks appearing as a new home settles
- Second-fix sealing on new plots
- Beads laid onto grit and dust from the build
How we handle new build mastic in St Cross
For builders and developers, we work through plots to the schedule you give us. Bathrooms, en suites, kitchens, frames and skirting are sealed ready for handover with a sealant suited to each area. We work on plot handovers, windows & doors and show homes, and people most often call us about cracked sealant around new window and door frames and sealant that never bonded to the surface.
In and around St Cross, floors range from older timber boards to tiles and newer finishes, each moving in its own way. Skirting and threshold joints need a sealant that suits the floor.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Location
- St Cross (SO22, SO23)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Quotes for new build mastic in St Cross
You’ll get a clear quote before work begins. It’s based on:
- Any working-time requirements on site
- Any mould that needs treating
- Which sealant suits the joint
- Whether the work is at height
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts.
What we need to know
Photos help, but a description is a good start. Please mention:
- The type of property
- Any access issues, like height or stairs
- Any previous sealing or DIY work
- How many joints, rooms or windows are involved
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll explain what’s involved before giving you a price.
Can I do it myself?
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Follow the cure time we give you
- Check bath and shower seals every few months as the house settles
- Use the extractor fan every time you shower
- Raise failed sealant with the developer while you are covered
Follow the cure time we give you before the area gets wet. Silicone is usually left for about a day to cure enough for use.
Report failed sealant to the builder while you’re in the snagging period. After that, putting it right may fall to you.
Towns and villages near St Cross
What else we do in St Cross
Work for landlords, hotels and businesses
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
New build mastic around St 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.
For new homes near Winchester station, it’s worth checking the sealant early, while snags are still fresh. Around St Cross, as everywhere, new build mastic is only as good as the preparation behind it.
St Cross is about 1 mile south of Winchester, in Hampshire. Homes, rented property, offices and hotels in St Cross can book us for new build mastic, old or new, large or small. Every job comes with our one-year guarantee. We cover 683 towns and villages across Hampshire. Southampton is on our list too, about 10 miles from St Cross.
We work across the SO22 and SO23 postcode area for new build mastic. You will find streets such as Edgar Road, Hubert Road and Grange Road, all of which we cover. Neighbouring places we cover for new build mastic include Badger Farm (1 mile west), Stanmore (1 mile north-west), Winchester (1 mile north), Bar End (1 mile east) and Highcliffe (1 mile north-east). Within a short drive, we also cover Eastleigh (6 miles south), Fareham (15 miles south), Andover (13 miles north-west), Totton (12 miles south-west), Chandler's Ford (5 miles south-west) and Hedge End (9 miles south).
Landmarks near St Cross
In St Cross, that means homes and buildings near St. Cross Park, The Bell Inn Public House and Kings' School and the streets around them. For rail, the closest station is Winchester station, about 1.3 miles north of the centre. A little further out are The Gurkha Museum (0.6 miles north-east) and Royal Hampshire County Hospital (0.9 miles north). Not far away are Hockley Meadows and Twyford Down.
How it works
Good joint work is mostly preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to several days, depending on the number of plots. Parking around St Cross is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- We look at why each joint failed, including any movement.
- We remove the failed sealant and clean the joints.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
Preparing for the visit
- Clear items away from the joints we are working on
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
Ask for a quote
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details.
Read more
Why act early in St Cross
A tube of sealant from the DIY shop will not fix the cause: dust, no primer and old sealant left in the joint. Cutting out, cleaning and priming are what make the difference. Around St Cross, water from a failed joint in an older home can soak into timber and plaster, and that’s a much bigger job than renewing the sealant.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll explain what it covers.
Why choose Mr Mastic in St Cross
- Neat joints and a tidy finish
- Domestic, commercial and hotel work
- An ARBOMaster approved applicator
- Old sealant always removed completely
Take a look at what affects the cost or what customers say.
Questions from St Cross
Do you work for landlords with property near Winchester station?
Yes. We work for letting agents and landlords as well as householders. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Is St Cross within the area you cover?
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.
Can you reseal over the builder’s sealant?
No. The old sealant is cut out fully, then clean and prime the joint, and a new bead applied.
How long does the job take?
That depends on how much there is to do, but most jobs take a few hours for most snagging lists, longer for a run of plots. We will give you a better idea when we quote.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, and for outside work we will agree access with you when we book.
Can you work from my snagging list?
Yes. We often work straight from a snagging list. We agree the sealant items with you before work begins.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
When it isn’t the sealant
A few problems are outside what sealant work can do:
- Your warranty claim itself, which is between you and the builder
- Baths and trays that move too much for sealant to cope with
- Damaged fittings that need replacing
If in doubt, phone 0345 464 0079 or email us and we will say what we think before you book.
Where we work in St Cross
- Windows & doors
- Show homes
- Plot handovers
- Skirting & floors
- Kitchens
- Bathrooms & en suites