Hampshire · England
New-build mastic & snagging in Newtown, Hampshire
New build mastic across Newtown and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Internal frame sealant that has split
- Second-fix sealing on new plots
- Cracked caulk along new skirting
FAQs for Newtown
Is Newtown in your area for new build mastic?
Yes, Newtown is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing.
I let a flat near Portchester station. Can you help?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll send you a clear quote.
When is the best time to reseal in a new build?
It depends on whether water is getting through. Failed seals in wet areas need doing now, while small cosmetic gaps can wait a while.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can you work from my snagging list?
Yes. Send it with pictures and we’ll quote for the sealant items. If something isn’t sealant, we will say so.
Will it make a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
Who should fix failed sealant in a new build?
While the snagging or warranty period runs, the builder should be your first contact. If it isn’t sorted, or keeps failing, get in touch with us.
How we handle new build mastic in Newtown
Across Newtown, we work for both new-home owners and the builders handing those homes over. Whether it’s one en suite or a run of plots, the method is the same: remove, clean, prime where needed, then a neat new bead. If you’re dealing with untidy sealant flagged on a snagging list and new-build shower sealant that has already split, we can help.
Somewhere as small as Newtown, new homes tend to be conversions, self-builds or a few houses rather than an estate. Each still needs its sealant and floor joints finished properly.
Big or small, you get the same one-year guarantee.
- Where
- Newtown (PO17)
- Region
- Hampshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What the job involves on each surface
Kitchens
Worktops in new homes can move slightly as the house dries, which opens gaps along the back. A fresh flexible bead closes them.
Plot handovers
Taking time over preparation reduces return visits. We clean out building dust before sealing and prime where the product needs it.
Also near Newtown
What else we do in Newtown
What happens if it’s left?
Sealant done properly at handover means fewer callbacks. Every return visit for a failed seal takes time and most come down to preparation. Older cottages and farmhouses around Newtown can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why book with us
- More than 20 years in sealant work
- We are fully insured
- We never seal over old sealant
- Tidy, careful work
Take a look at what affects the cost and customer reviews.
How we quote for new build mastic
We quote each job individually. These are the things that affect it:
- How much old sealant there is and how hard it is to remove
- How easy the joints are to reach
- How many areas need sealing
- Which sealant suits the joint
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Roughly how big the job is
- What’s wrong with the joints now
- A few pictures by email, if you can
- Where the job is, and your postcode
There’s no standard price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To arrange one, call 0345 464 0079 or drop us an email.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Joints and finishes in Newtown homes
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In and around Newtown, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Newtown is about 5 miles north-west of Waterlooville, in Hampshire. Every kind of property in Newtown can book us for new build mastic. Every job comes with our one-year guarantee. 683 places in Hampshire are on our list, large and small. You can also see our page for Portsmouth, roughly 8 miles from Newtown.
We cover every part of PO17 for new build mastic. New build mastic is available to properties on Church Road, Hundred Acres Road and Ingoldfield Lane. Close by, we work in Southend (1 mile north-east), Soberton Heath (1 mile north), Hoe Gate (1 mile east), Hipley (1 mile south-east) and Woodend (1 mile north-west). Within a short drive, we also cover Winchester (13 miles north-west), Gosport (8 miles south), Havant (7 miles south-east), Eastleigh (10 miles west), Fareham (5 miles south-west) and Horndean (5 miles east).
What’s near Newtown
We work in homes and buildings around The Bold Forester Public House, among other places. For rail, the closest station is Portchester station, roughly 4.4 miles south of the centre. Nearby you’ll also find Knowle Hospital (3.8 miles south-west). Green spaces nearby include St Clair's Meadow and Portsdown Hill.
How it works
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the work takes a few hours in a single home for a typical job. Somewhere like Newtown needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip 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.
- A sealant chosen for each area goes in and is tooled smooth.
- We check every joint and tell you how long each needs to cure.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.
Read more
Signs you need new build mastic in Newtown
On many sites, sealant goes on in the final rush before handover. Joints aren’t always cleaned of dust or primed, and the sealant sits on grit instead of the surface.
It’s worth asking for a quote if you see:
- Cracked sealant around new window and door frames
- Plot mastic for developers ahead of handover
- Cracked caulk along new skirting
- New-build shower sealant that has already split
For new homes near Portchester station, it’s worth checking the sealant early, while snags are still fresh.
Comparing quotes
- Whether all the old sealant comes out first
- Who does the work, and how experienced they are
- Are they insured?
- Whether the sealant suits the joint