Hampshire · England
New-build mastic & snagging in Four Marks, Hampshire
New-build sealant joints in Four Marks need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Worktop and upstand sealant coming away
- Gaps opening as the house dries out and settles
- Sealant that never bonded to the surface
New build mastic in Four Marks, done properly
If your new home has a leaking shower seal, open skirting joints or untidy sealant, we can help. While the builder’s snagging or warranty period runs, report it to them first, and if it isn’t put right, get in touch with us. Typical jobs include cracked caulk along new skirting and sealant that never bonded to the surface, on plot handovers, kitchens and skirting & floors.
In and around Four Marks, floors range from older timber boards to tiles and newer finishes, from timber that moves with the seasons to tiles laid on concrete. The sealant at skirtings and thresholds has to suit the floor it meets.
Your job is guaranteed for a year, as with all our work.
- Where
- Four Marks (GU34)
- Region
- Hampshire
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
Mouldy or split sealant often shows up at the end of a tenancy. We can quote for more than one property at once.
Towns and villages near Four Marks
What else we do in Four Marks
New homes and floors in Four Marks
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Four Marks, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Four Marks is about 4 miles south-west of Alton, in Hampshire. Every kind of property in Four Marks can book us for new build mastic, old or new, large or small. The work is guaranteed for a year. 683 places in Hampshire are on our list, from the larger towns to small villages. Southampton is on our list too, around 20 miles away.
All of GU34 is covered for new build mastic. Streets in the area include Read's Field, River Close and Chalk Close, all of which we cover. Other places close to Four Marks include Medstead (1 mile north), Soldridge (1 mile west), South Town (2 miles north-west), New Copse (2 miles north) and Hattingley (2 miles north-west). We also work in nearby towns such as Basingstoke (11 miles north), Winchester (12 miles west), Fleet (15 miles north-east), Horndean (14 miles south), Alton (4 miles north-east) and Petersfield (9 miles south-east).
Local landmarks in Four Marks
For rail, the closest station is Alton station, roughly 4.6 miles north-east of the centre. A little further out are Barton Castle (3.5 miles north-west) and Alton Community Hospital (3.3 miles north-east). The countryside around Four Marks includes Red Hill.
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Leaks from pipes, valves or wastes, which need a plumber
- Broken tiles or a split tray
- Disputes or warranty claims with your builder
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Joints and surfaces we work on
- Show homes
- Bathrooms & en suites
- Kitchens
- Windows & doors
- Plot handovers
- Skirting & floors
What happens if it’s left?
It often makes sense to do all the sealant items on a snagging list together. You get one visit and one clear quote for the lot. Around Four Marks, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Doing several joints on one visit is normally more efficient than separate visits. You will get one clear quote for the whole job.
Why choose Mr Mastic in Four Marks
- Domestic, commercial and hotel work
- A choice of colours where the product allows
- Any old sealant cut out fully, not covered over
- 20+ years of sealant experience
Four Marks questions
I let a flat near Alton station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear quote.
Can you do new build mastic in Four Marks?
Yes. Our work covers London and the South East, and Four Marks is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Why does sealant fail so quickly in new builds?
A new house dries and settles for a year or two, and sealant is often applied quickly onto dusty surfaces. Either can make it fail early.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Can new sealant go on top of the old bead?
No. The old sealant is cut out fully, the joint cleaned and primed where needed, and a new bead applied.
Can you do plot mastic on a new development?
Yes. Second-fix sealing in bathrooms, kitchens, frames and floors is part of what we do. We clean and prime joints properly to keep callbacks down.
Should I go to my builder first?
Start with the builder if you’re in the snagging or warranty period. Once that is done, or if they will not put it right, we’ll cut it out and reseal it.
What do you need from me for a quote?
Tell us what needs doing and where. If we need more, we’ll ask.
The process
On the day, there’s very little for you to do. Show us the job and we will take it from there. The job generally takes a few hours for most snagging lists, longer for a run of plots. For a job in Four Marks, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- Each joint is checked for movement before we start.
- We remove the failed sealant and clean the joints.
- Joints are dried and primed where the product calls for it.
- 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.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
- Mention any sign-in or site rules at work premises
Get a quote
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will talk you through the work and give you a clear price.
Read more
Surface by surface
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. The old sealant comes out and anti-fungal sanitary silicone goes in after cleaning and priming.
Plot handovers
Plot mastic is carried out to the developer’s schedule. Joints are prepared properly before sealing so the sealant lasts.
Signs you need new build mastic in Four Marks
Sealant is often one of the last jobs before handover. Joints aren’t always cleaned of dust or primed, and the sealant sits on grit instead of the surface.
Look out for any of the following:
- Plot mastic for developers ahead of handover
- Gaps between new skirting and floors
- Kitchen sealant that has pulled off the wall
- Shower seals failing in the first year or two
If you’ve bought a new home near Alton station, the sealant around baths, showers and frames is worth checking in the first year or two.
What your quote should include
- What insurance they hold
- Whether they seal over old material or remove it
- How the surfaces are prepared before sealing
- How long to leave it before use
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Put sealant faults on your snagging list early
- Wait for the cure time before using a resealed shower
- Use the extractor fan every time you shower
- Look at the sealant regularly in the first couple of years
Wipe the sealant with warm soapy water. Keep scourers and harsh chemicals off it.
Leave a failed new-build seal and water can reach the floor and the ceiling below. Catching it early keeps the fix to the sealant and the new finishes intact.