Hampshire · England
New-build mastic & snagging in Thedden, Hampshire
Specialist new build mastic for Thedden: careful preparation, the right product and tidy work. Call for a quick quote.
- Leaking shower tray seals in a new home
- Cracked sealant around new window and door frames
- Beads laid onto grit and dust from the build
When to call us in Thedden
The wrong product is sometimes used in the wrong place: decorators’ caulk in a wet area, or a stiff sealant where there’s movement. Neither lasts long.
It’s worth asking for a quote if you see:
- Second-fix sealing on new plots
- Untidy sealant flagged on a snagging list
- Gaps opening as the house dries out and settles
- Sealant applied over dusty or wet surfaces
Around Thedden, as everywhere, new build mastic is only as good as the preparation behind it.
Before booking anyone
- The length of the guarantee
- Whether VAT is included
- What happens if they find a problem under the old sealant
- Who turns up on the day
New build mastic in Thedden
Some new-home owners let the house settle before resealing. For small cosmetic gaps, that’s reasonable, but a seal that is letting water through needs doing now. If you’re dealing with smeared, uneven beads picked up at snagging and frame joints opening as the plaster dries, we can help.
Around Thedden, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
We stand behind the work with a 12-month guarantee.
- Place
- Thedden (GU34)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from Thedden
I let a flat near Alton station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Will you come out to Thedden?
Yes, Thedden is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Is it normal for sealant to crack in a new home?
There are usually two causes: the house moving as it dries, and sealant that never bonded properly. A proper reseal deals with both.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before applying anything new.
Can you reseal over the builder’s sealant?
No. Over-sealing traps mould and water and soon fails. All the old sealant comes out before any work starts.
What does new build mastic cost?
We don’t publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before we start.
When is the best time to reseal in a new build?
For failed seals that let water through, the best time is now. Cosmetic gaps can wait until the first year or two of movement has passed.
Where do you work from?
We are based in Crawley, West Sussex, and we work across South East England, London and Scotland.
How to look after the new joints
A little care helps the new joints last. We recommend:
- Look at the sealant regularly in the first couple of years
- Do not wait for the house to settle if water is getting through
- Raise failed sealant with the developer while you are covered
- Clean sealant with mild detergent, not abrasives
Keep the bathroom ventilated, especially in the first year. Use the extractor fan or open a window after showers.
Early snagging is easier snagging. Left alone, a small crack can become a leak over time.
How we quote for new build mastic
We do not publish a price list. What we look at:
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Any working-time requirements on site
- Which sealant suits the joint
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will go through it with you.
What we need to know
Photos help, but a description is a good start. Please mention:
- Whether it has been sealed before
- How we’d reach the joints
- The problem you’ve noticed
- The rough size of the job
Want a quote for new build mastic? Please phone 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
New build mastic in Thedden: local notes
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.
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.
Thedden is about 2 miles west of Alton, in Hampshire. Jobs in Thedden get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Our Hampshire coverage runs to 683 places, Thedden among them. Our Reading page covers work nearby (21 miles or so).
We work across the GU34 postcode area for new build mastic. Close by, we work in Beech (1 mile south-east), Wivelrod (1 mile south-west), Bentworth (1 mile north-west), Holt End (1 mile west) and New Copse (2 miles west). Larger places within reach include Basingstoke (9 miles north), Winchester (14 miles south-west), Farnborough (15 miles north-east), Fleet (12 miles north-east), Aldershot (13 miles north-east) and Petersfield (10 miles south).
Local landmarks in Thedden
For rail, the closest station is Alton station, about 2.6 miles east. Nearby you’ll also find Alton Community Hospital (1.6 miles east) and Barton Castle (3.9 miles west). Not far away are King's Hill.
When something else is needed
To be straight with you, some problems need a different trade:
- Plumbing faults behind the sealant
- Movement caused by a poorly fitted tray or bath
- Broken tiles or a split tray
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before booking.
Where we work in Thedden
- Kitchens
- Windows & doors
- Show homes
- Skirting & floors
- Bathrooms & en suites
- Plot handovers
What else we do in Thedden
Different surfaces, different methods
Plot handovers
We work through plots to your schedule, sealing each room ready for handover. Each joint is cleaned and primed where needed so the sealant lasts.
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.
How it works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a few hours in a single home. Somewhere like Thedden 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.
- 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.
- The finished joints are checked and the cure times given.
Preparing for the visit
- Mention any tricky access
- For indoor joints, keep the area dry beforehand if you can
- Mention any sign-in or site rules at work premises
Get a quote
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.
Advice
Leave it or put it right?
For developers, getting the sealant right first time saves return visits. Snagging visits for failed sealant cost time on every plot, and they’re avoidable with good preparation. In a small place like Thedden, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Why choose Mr Mastic in Thedden
- Fully insured
- Tidy, careful work
- Over 20 years’ experience
- Trusted Arbo and Everbuild sealants
See our cost guide or customer reviews.