Hampshire · England
Southrope New Build Mastic
Our applicators work in Southrope on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Internal frame sealant that has split
- Messy sealant that spoils new finishes
- Gaps behind new kitchen upstands
How we handle new build mastic in Southrope
Our new-build work comes in two parts: plot mastic for developers, and putting right failed sealant for people who’ve bought a new home. In both, preparation makes the difference. Typical jobs include cracked sealant around new window and door frames and worktop and upstand sealant coming away, on windows & doors, plot handovers and kitchens.
Older homes in small places like Southrope often have timber floors that move with the seasons, which is why skirting and threshold joints need a flexible sealant, not filler.
There’s a 12-month guarantee on every job, large or small.
- Location
- Southrope (RG25)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why act early in Southrope
For developers, getting the sealant right first time saves return visits. Every return visit for a failed seal takes time. Around Southrope, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What you get with us
- 4.9 on Google from 180+ five-star reviews
- Full insurance on every job
- 20+ years of sealant experience
- Any old sealant cut out fully, not covered over
Read how sealant jobs are priced or our reviews.
More services for Southrope
What affects the cost of new build mastic
We quote each job individually. These are the things that affect it:
- The product the joint needs
- Any working-time requirements on site
- The number and length of the joints
- Access and height
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What to tell us for a quote
When you call or email, it’s useful to know:
- Photos by email, if that’s easy
- Access, such as stairs, a lift or height
- The type of property
- Where the property is
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
Signs you need new build mastic in Southrope
Later trades and the final clean can damage fresh sealant. If it’s disturbed before curing, the joint can be left weak and it shows once the home is in use.
It’s worth asking for a quote if you see:
- Cracked caulk along new skirting
- Kitchen sealant that has pulled off the wall
- Joints pulling apart as timber shrinks
- Smeared, uneven beads picked up at snagging
For new homes near Alton station, it’s worth checking the sealant early, while snags are still fresh.
Comparing quotes
- Is VAT in the price?
- What insurance they hold
- Whether all the old sealant comes out first
- What product goes in the joint
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Baths and trays that move too much for sealant to cope with
- Cracking that points to a structural problem
- Plumbing faults behind the sealant
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
Where we work in Southrope
- Windows & doors
- Bathrooms & en suites
- Kitchens
- Skirting & floors
- Plot handovers
- Show homes
How the visit works
On the day, there’s very little for you to do. Show us the job and we will take it from there. The work itself takes a few hours in a single home from start to finish. Somewhere like Southrope needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we work through your snagging list or plot schedule with you.
- 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.
How to prepare
- Mention any leaks or damp you’ve noticed
- Let us know about parking restrictions
- Keep children and pets away from the work area
Getting a quote
For a quote, call 0345 464 0079 or email us with the location and a short description of the problem. You’ll have a clear quote before any work starts.
Read more
Surface by surface
Plot handovers
Send us the schedule and any sealant specification and we will quote. Sealant work across the plot is covered as agreed.
Windows and doors
Internal joints between frames and plaster often crack as a new house dries. We remove cracked sealant and apply a flexible one.
Joints and finishes in Southrope homes
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Southrope, as everywhere, new build mastic is only as good as the preparation behind it.
Southrope is about 4 miles north-west of Alton, in Hampshire. We carry out new build mastic for homeowners, landlords and businesses in Southrope, as part of our work across Hampshire. Southrope is one of 683 towns and villages in Hampshire where we work for new build mastic. We also work in Reading, around 17 miles away.
Work in RG25 is quoted and booked the same way as anywhere else. That includes homes and businesses on King Johns Lane, Back Lane and Hockleys Lane and the roads around them. We also cover the places around Southrope: Bagmore (1 mile west), Burkham (2 miles south-west), Shalden Green (2 miles south-east), Shalden (2 miles south-east) and Bentworth (3 miles south). Within a short drive, we also cover Basingstoke (5 miles north-west), Winchester (15 miles south-west), Farnborough (14 miles north-east), Fleet (10 miles north-east), Aldershot (13 miles east) and Alton (4 miles south-east).
Local landmarks in Southrope
The closest station to Southrope is Alton station, roughly 4.5 miles south-east of the centre. Well-known places in the area include Gliding Heritage Centre (1.2 miles south-east) and Basing House (4.9 miles north). Open spaces near Southrope include Holybourne Hill.
Work for landlords, hotels and businesses
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
For anyone letting property in or around Southrope, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
Your questions about new build mastic in Southrope
Can you do new build mastic in Southrope?
Yes. Our work covers London and the South East, and Southrope is part of that. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear quote.
I let a flat near Alton station. Can you help?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Do you work for developers?
Yes. We seal plots to the developer’s programme ready for handover. Tell us the plots and the joints involved and we will quote.
Should I go to my builder first?
Start with your builder while their snagging or warranty period runs. If that doesn’t work out, we’re happy to quote.
Do you work through snagging lists?
Yes. We often work straight from a snagging list. We’ll go through the sealant items and agree what we will do.
How long will you be here?
That depends on the amount of work, 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.
Where is Mr Mastic based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
Is it normal for sealant to crack in a new home?
It’s common, and there are normally two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. A proper reseal deals with both.