Southampton · England
New-build mastic & snagging in Harefield, Southampton
Professional new build mastic in and around Harefield, with every bit of old sealant taken out first.
- Leaking shower tray seals in a new home
- Frame joints opening as the plaster dries
- Worktop and upstand sealant coming away
For landlords and businesses
For anyone letting property in or around Harefield, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll quote.
New build mastic in Harefield, done properly
Building dust is behind a lot of failed new-build sealant. Each joint is cleaned of dust and primed where the product calls for it, so the sealant actually sticks. We work on kitchens, show homes and windows & doors, and the jobs we see most are smeared, uneven beads picked up at snagging and skirting joints opening in the first winter.
If you’ve bought a new home in or near Harefield, the first year or two is a good time to check the sealant. Common snags include open skirting joints, lifting shower seals and gaps around frames.
There’s a 12-month guarantee on every job.
- Where
- Harefield (SO18, SO19, SO30)
- Region
- Southampton
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
So the new joints stay in good condition:
- Photograph failed sealant before it’s redone
- Look at the sealant regularly in the first couple of years
- Don’t wait for the house to settle if water is getting through
- Wait for the cure time before using a resealed shower
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents.
Do not let the snagging period run out with sealant problems unreported. After that, putting it right may fall to you so report it promptly.
The process
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours in a single home. In a smaller place like Harefield, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- Each joint is checked for movement before work begins.
- Old sealant is cut out and the joints cleaned.
- 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.
Preparing for the visit
- Mention any tricky access
- For indoor joints, keep the area dry beforehand if you can
- Tell us if parking is tricky
Ask for a quote
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or send us an email with the details and send pictures if you have them.
Related advice
What affects the cost of new build mastic
Jobs vary more than people expect. The main factors:
- The number and length of the joints
- How many areas need sealing
- Whether the work is at height
- Whether old sealant or filler has to be cut out
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. The price is agreed before we begin.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- Whether it has been sealed before
- Roughly how big the job is
- The type of property
- Where the job is, and your postcode
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.
FAQs for Harefield
Is Harefield in your area for new build mastic?
Yes, Harefield is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Is Harefield within the area you cover?
Yes, Harefield is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
How long before the joint can be used?
Different products cure at different speeds, so please follow the time we give you.
Is there a guarantee?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we will put it right.
Can you match the sealant colour to my new kitchen or bathroom?
The colour is chosen to suit the tiles, worktop or frame. Let us know your preference when you ask for a quote.
Can landlords and businesses book you?
Yes. We work in homes, commercial premises and hotels, and we’re fully insured.
Why has my new-build shower seal failed already?
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.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
New build mastic in Harefield: local notes
Harefield is within about 3 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. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Around Harefield, as everywhere, new build mastic is only as good as the preparation behind it. If you’ve bought a new home near Bitterne station, the sealant around baths, showers and frames is worth checking in the first year or two.
Harefield is about 2 miles east of Southampton, in Southampton. We provide new build mastic to householders, landlords and businesses in Harefield and the surrounding area. Across Southampton, we cover 40 places, and Harefield is one of them.
Every address in SO18, SO19 and SO30 is covered for new build mastic, from the main roads to the quietest streets. New build mastic is available to properties on Dean Road, Marne Road and Keats Road. Main roads around Harefield include the A334, so getting to you is simple. Close by, we work in Thornhill (1 mile south), West End (1 mile north), Chartwell Green (1 mile north), Bitterne (1 mile south-west) and Townhill Park (1 mile north-west). Larger places within reach include Shirley (4 miles west), Regents Park (4 miles west), Maybush (5 miles west), Coxford (4 miles west), Freemantle (4 miles west) and Lordswood (4 miles north-west). Harefield is one of the larger places we cover in Southampton.
Near you in Harefield
We work in homes and buildings around The Gregg School, Woodlands Community College and The Red Lion pub, among other places. The nearest railway station is Bitterne station, about 1.5 miles west. Other landmarks nearby include Moorgreen Hospital (1.1 miles north-east) and Netley Castle (3 miles south). Not far away are Netley Common.
How the job changes by surface
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. It’s resealed with an exterior sealant suited to the frame and wall.
Kitchens
Beside the sink, the joint takes water every day. We use a sealant suited to kitchens suited to the job.
Towns and villages near Harefield
Other services in Harefield
When something else is needed
To be straight with you, some problems need a different trade:
- Cracking that points to a structural problem
- Damaged fittings that need replacing
- Deciding who is responsible under a builder’s warranty
If in doubt, call 0345 464 0079 or send us an email and we will say what we think before booking.
What we seal
- Windows & doors
- Show homes
- Kitchens
- Plot handovers
- Skirting & floors
- Bathrooms & en suites
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
If you’ve already had a go yourself, that’s fine. We cut it out and start again.