Southampton · England
New-build mastic & snagging in Inner Avenue, Southampton
Professional new build mastic in and around Inner Avenue, with old sealant always removed completely and a 12-month guarantee.
- New-build shower sealant that has already split
- Plot mastic for developers ahead of handover
- Cracked sealant around new window and door frames
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Watch for new gaps as the house dries out
- Report sealant problems to your builder during the snagging period
- Follow the cure time we give you
- Open a window or run the fan after bathing
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.
Early snagging is easier snagging. Small faults turn into leaks if left over time.
New build mastic for homes and businesses in Inner Avenue
A new house keeps drying out and settling for its first couple of years. Timber shrinks, plaster dries and baths and trays bed down, and sealant applied in a hurry at handover can split. If you have second-fix sealing on new plots and new-build shower sealant that has already split, we can put it right, on plot handovers, windows & doors and bathrooms & en suites alike.
Where new homes go up in smaller places like Inner Avenue, it’s often a small development or a single plot. Each still needs its sealant and floor joints finished properly from day one.
Your job is guaranteed for a year, as with all our work.
- Where
- Inner Avenue (SO14, SO15, SO17)
- Region
- Southampton
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Leave it or put it right?
The builder is usually the first port of call while the snagging or warranty period runs. If it keeps failing or isn’t dealt with, we can reseal it properly. Around Inner Avenue, water from a failed joint in an older home can soak into timber and plaster, and that is a much bigger job than renewing the sealant.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Why us?
- One-year guarantee on every job
- Anti-fungal silicone where joints get wet
- Neat joints and a tidy finish
- More than 20 years in sealant work
See our cost guide or our reviews.
What we do, step by step
A visit follows a simple pattern: we look at the joints together, protect the area around them, carry out the job and tidy away. Most jobs take a few hours in a single home. For a job in Inner Avenue, 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 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.
- The finished joints are checked and the cure times given.
Before we arrive
- Clear the area around the work
- Let us know about stairs, lifts or work at height
- For indoor joints, keep the area dry beforehand if you can
Get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved before giving you a price.
Read more
What the job involves on each surface
Skirting and floors
New homes often develop a gap between skirting and floor. We seal it with a flexible sealant that copes with the movement.
Plot handovers
Developers can send the plot schedule and specification and we’ll quote. We seal bathrooms, kitchens, frames and floors as agreed.
New build mastic around Inner Avenue
Inner Avenue is within about 2 miles of the coast. New homes near the sea put their outside mastic to work from day one, so any gaps are best picked up early. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In and around Inner Avenue, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Inner Avenue is about 1 mile west of Southampton, in Southampton. Homes, rented property, offices and hotels in Inner Avenue is covered for new build mastic. The work is guaranteed for a year. Inner Avenue is one of 40 towns and villages in Southampton where we work.
Work in SO14, SO15 and SO17 works the same way as everywhere else we cover. You’ll find streets such as Alma Road, Rose Road and Lawn Road, all of which we cover. If you are just outside Inner Avenue, we cover Southampton (1 mile east), Portswood (1 mile north-east), St Denys (1 mile north-east), Bitterne Manor (1 mile east) and St Mary's (1 mile south). We also work in nearby towns such as Thornhill (3 miles east), Eling (4 miles west), Rownhams (3 miles north-west), Weston (3 miles south-east), Hounsdown (4 miles west) and Nursling (3 miles north-west).
Local landmarks in Inner Avenue
Around Inner Avenue, our work takes us to homes and buildings near St Anne's Catholic School, St Mary's Independent School and Rockstone Place Park and the streets around them. The closest station to Inner Avenue is St Denys station, about 0.6 miles north-east. A little further out are Royal South Hants Hospital (less than half a mile south-east) and Marlands Shopping Centre (0.8 miles south). Open spaces near Inner Avenue include Netley Common.
Towns and villages near Inner Avenue
More services for Inner Avenue
Landlords, agents and businesses in Inner Avenue
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Inner Avenue: your questions answered
Can you do new build mastic in Inner Avenue?
Yes, Inner Avenue is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we will give you a clear price.
Do you cover smaller places like Inner Avenue?
Yes. Inner Avenue is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Where are you based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Do you work for landlords and businesses?
Yes. Domestic, commercial and hotel work are all part of what we do, and we’re fully insured.
Can you do plot mastic on a new development?
Yes. We take on second-fix sealant work across new plots. Good preparation keeps snagging to a minimum.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Why has my new-build shower seal failed already?
Cracking in the first couple of years is common, because the house is drying and settling. Rushed application on dusty surfaces makes it worse.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Do you need new build mastic in Inner Avenue?
A new house holds a lot of water from the build, and it dries out over the first couple of years. As it does, timber shrinks and joints open, and sealant that cannot keep up splits.
Keep an eye out for any of the following:
- Second-fix sealing on new plots
- Cracked sealant around new window and door frames
- Joints pulling apart as timber shrinks
- Sealant that never bonded to the surface
If you’ve bought a new home near St Denys station, the sealant around baths, showers and frames is worth checking in the first year or two.
Questions to ask before booking
- Whether the sealant suits the joint
- Is the old sealant removed completely?
- How long to leave it before use
- What insurance they hold