Hampshire · England
New-build mastic & snagging in Dummer, Hampshire
Problem with your new-build sealant joints in Dummer? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Messy sealant that spoils new finishes
- Sealant applied over dusty or wet surfaces
- Skirting joints opening in the first winter
About our new build mastic in Dummer
We carry out plot mastic and second-fix sealing for builders, and snagging reseals for new-home owners. In both, preparation makes the difference, because that is what rushed new-build sealant normally lacks. We work on windows & doors, skirting & floors and bathrooms & en suites, and the jobs we see most are kitchen sealant that has pulled off the wall and sealant work across a run of new homes.
Around Dummer, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Where
- Dummer (RG25)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Leave it or put it right?
A failed shower or bath seal in a new home lets water into floors and walls that are still drying out. Resealing promptly protects the new finishes around it. Older cottages and farmhouses around Dummer can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on the amount of work, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Why us?
- 4.9 on Google from 180+ five-star reviews
- An ARBOMaster approved applicator
- We’re fully insured
- 12-month guarantee on every job
Take a look at what affects the cost or customer reviews.
Your questions about new build mastic in Dummer
Do you cover smaller places like Dummer?
Yes, Dummer is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is Dummer in your area for new build mastic?
Yes, Dummer is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear quote.
Where do you work from?
We’re based in Crawley, and we work across South East England, London and Scotland.
Can you do plot mastic on a new development?
Yes. We carry out plot mastic and second-fix sealing for builders and developers. Send the schedule and any specification and we’ll give you a quote.
Who should fix failed sealant in a new build?
Start with your builder while their snagging or warranty period runs. If that does not work out, we’re happy to quote and our work is guaranteed for a year.
Is it normal for sealant to crack in a new home?
It’s common, and there are usually two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. A proper reseal deals with both.
Are you insured?
Yes. Mr Mastic is fully insured.
Can landlords and businesses book you?
Yes. As well as householders, we work for landlords, agents, businesses and hotels across Hampshire.
The process
We bring everything the job needs with us. After a quick look at the joints together, we protect the area and start. It normally takes a few hours in a single home. Somewhere like Dummer 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.
- We look at why each joint failed, including any movement.
- Old sealant is cut out and the joints cleaned.
- Joints are dried and primed where the product calls for it.
- Baths are filled with water, then the new sealant is applied.
- We check every joint and leave you with the cure times.
How to prepare
- Let us know about stairs, lifts or work at height
- Let us know about earlier repairs to the joints
- Mention any sign-in or site rules at work premises
How to get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and send you a clear quote.
Read more
What new build mastic looks like in Dummer
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Around Dummer, as everywhere, new build mastic is only as good as the preparation behind it.
Dummer is about 4 miles south-west of Basingstoke, in Hampshire. Every kind of property in Dummer is covered for new build mastic. The work is guaranteed for a year. Dummer is one of 683 towns and villages in Hampshire we cover. There’s also a page for Reading, roughly 18 miles from Dummer.
Our applicators cover all of RG25 for new build mastic. You’ll find streets such as Down Street, Post Office Lane and Porters Close, and we cover them all. Nearby, we also carry out new build mastic in North Waltham (2 miles west), Farleigh Wallop (2 miles east), Kempshott (2 miles north), Hatch Warren (2 miles north-east) and Oakley (3 miles north). Larger places within reach include Basingstoke (4 miles north-east), Winchester (13 miles south-west), Fleet (15 miles east), Andover (14 miles west), Alton (9 miles south-east) and Tadley (10 miles north).
Local landmarks in Dummer
Locally, jobs take us to homes and businesses close to The Queen Inn. Dummer’s nearest station is Micheldever station, about 4.8 miles south-west. Other landmarks nearby include Park Prewett Hospital (5 miles north). Not far away are Farleigh Hill.
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
What sealant work cannot fix
Sealant isn’t the answer to every problem, and we will tell you before any work starts. It will not solve:
- Broken tiles or a split tray
- Your warranty claim itself, which is between you and the builder
- Plumbing faults behind the sealant
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
What we seal
- Kitchens
- Windows & doors
- Bathrooms & en suites
- Plot handovers
- Skirting & floors
- Show homes
What affects the cost of new build mastic
For a quick quote, just ask. The main things that affect it are:
- How many areas need sealing
- The size of the job
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll go through it with you.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Where the property is
- How many joints, rooms or windows are involved
- If someone has resealed it before
- A few photos by email, if you can
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Other services in Dummer
Do you need new build mastic in Dummer?
Sealant is often one of the last jobs before handover. Dusty, unprimed joints are common, and the sealant sits on grit instead of the surface.
It’s worth asking for a quote if you see:
- Sealant applied over dusty or wet surfaces
- Leaking shower tray seals in a new home
- Sealant work across a run of new homes
- Joints pulling apart as timber shrinks
For new homes near Micheldever station, it’s worth checking the sealant early, while snags are still fresh.
Comparing quotes
- What the cure time is
- What guarantee comes with the work
- Whether you can choose the colour
- What happens if they find a problem under the old sealant