Southampton · England
Northam New Build Mastic
Professional new build mastic in and around Northam, with every bit of old sealant taken out first and a 12-month guarantee.
- Skirting joints opening in the first winter
- Sealant work across a run of new homes
- Gaps behind new kitchen upstands
New build mastic in Northam
We work in new homes and on new-build sites across Northam. 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. We work on skirting & floors, plot handovers and show homes, and common reasons people get in touch are cracks appearing as a new home settles and cracked sealant around new window and door frames.
If you’ve bought a new home in or near Northam, the first year or two is a good time to check the sealant. Gaps at skirtings, shower seals pulling away and missing mastic around frames are common snags.
The work is covered for a year after we finish. If anything isn’t right with it, call 0345 464 0079 or send us an email.
- Location
- Northam (SO14, SO19, SO18)
- Region
- Southampton
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Plot handovers
Good preparation at handover saves snagging later. We clean out building dust before sealing and prime where the product needs it.
Windows and doors
Draughts around new frames are often a sealant gap. We look at the joints and reseal where needed.
What affects the cost of new build mastic
For a quick quote, just ask. What matters most is:
- The number and length of the joints
- Whether the work is at height
- How many areas need sealing
- Whether there’s mould to deal with
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
Photos help, but a description is a good start. Please mention:
- Any access issues, like height or stairs
- Where the property is
- The type of property
- What the problem is, such as mould, gaps, leaks or cracking
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. A few pictures by email make the job easier to understand, and we will take it from there.
Northam: your questions answered
Can you do new build mastic in Northam?
Yes, Northam is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Will you come out to Northam?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Will there be a smell?
There can be a smell while the sealant cures, but it fades. Opening a window helps.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
I’m a tenant. Can you help?
We’re happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
Is it normal for sealant to crack in a new home?
A new house dries and settles for a year or two, and sealant is often rushed onto dusty, unprimed surfaces. Either can make it fail early.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints.
What we do, step by step
There is not much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes a few hours for most snagging lists, longer for a run of plots. A visit to Northam is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- Each joint is checked for movement before work begins.
- 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.
How to prepare
- Clear the area around the work
- Let us know about earlier repairs to the joints
- Tell us about any water getting in
Ask for a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
Advice
Also near Northam
Also in Northam
Looking after it afterwards
Simple care keeps the joints in good condition. Our advice:
- Ventilate bathrooms well, especially in the first year
- Follow the cure time we give you
- Get a leaking seal dealt with right away
- Record problems with dated photos
Keep an eye on the joints over the first couple of years. Small gaps can appear as the house dries, and they’re simple to reseal once movement has slowed.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Early resealing keeps the job small and protects the rest of the house.
What new build mastic looks like in Northam
Northam is within about 2 miles of the coast. Plot mastic on new homes near the coast takes more weather than it would inland, so it’s worth checking at snagging. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Northam, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Northam is about 1 mile south-east of Southampton, in Southampton. Our applicators cover new build mastic for homes and businesses in Northam, as part of our work across Southampton. Northam is one of 40 places in Southampton we cover for new build mastic.
We work across SO14, SO19 and SO18 for new build mastic. You will find streets such as Sea Road, Lumpy Lane and Cross Road. Close by, we work in Peartree Green (1 mile south), Bitterne Manor (1 mile north), Itchen (1 mile south-east), St Mary's (1 mile south-west) and Bitterne (1 mile east). We also work in nearby towns such as Regents Park (3 miles west), Maybush (3 miles north-west), Coxford (3 miles north-west), Lordswood (3 miles north-west), Eling (5 miles west) and Rownhams (4 miles north-west).
Near you in Northam
We work in homes and buildings around Inspire Enterprise Academy, East Park and The Engineers Arms. The nearest railway station is Bitterne station, roughly 0.6 miles north. A little further out are Bitterne Local History Society Heritage And Research Centre (0.8 miles east) and Marlands Shopping Centre (1.2 miles west). The countryside around Northam includes Netley Common.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
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.
Why act early in Northam
Small cosmetic gaps can wait for the house to settle, but water getting through cannot. If you’re unsure which you have, call 0345 464 0079 or email us with pictures. In an older home around Northam, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. We take all of that into account in your quote.
Why book with us
- White, clear, grey or another colour, product permitting
- Sealant colour chosen to suit
- Anti-fungal sanitary silicone in wet areas
- Homes, businesses and hotels
Take a look at our cost guide and what customers say.
When to call us in Northam
New homes are full of moisture from plaster, screed and concrete, which takes a year or two to dry out. As it does, timber shrinks and joints open.
Most people get in touch after spotting one of these:
- Plot mastic for developers ahead of handover
- Skirting joints opening in the first winter
- Gaps behind new kitchen upstands
- Frame joints opening as the plaster dries
For new homes near Bitterne station, it’s worth checking the sealant early, while snags are still fresh.
What your quote should include
- What the cure time is
- Is the old sealant removed completely?
- Whether VAT is included
- How the surfaces are prepared before sealing