Hampshire · England
New-build mastic & snagging in Horndean, Hampshire
New build mastic for Horndean, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Leaking shower tray seals in a new home
- Cracked caulk along new skirting
- Kitchen sealant that has pulled off the wall
Landlord and commercial work in Horndean
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
New build mastic in Horndean
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’re dealing with shower seals failing in the first year or two and internal frame sealant that has split, we can help, on bathrooms & en suites, plot handovers and show homes alike.
Towns like Horndean have older streets and newer estates side by side. Whether a house is brand new or a few years old, sealant and floor joints are often the first snags to show.
Every job is covered by our one-year guarantee, wherever you are in Hampshire.
- Location
- Horndean (PO8, PO7)
- Wider area
- Hampshire
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Horndean questions
Is Horndean in your area for new build mastic?
Yes, Horndean is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and let us know what needs doing.
Is new build mastic in Horndean guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Where are you based?
Our base is Crawley. We work across South East England, London and Scotland.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
Do you work for landlords and businesses?
Yes. As well as householders, we work for landlords, agents, businesses and hotels.
Can new sealant go on top of the old bead?
No. Sealing over old sealant looks fine for a few weeks, then lifts. We remove every bit of the old bead before resealing.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. Then phone 0345 464 0079 or send us an email.
Also near Horndean
What else we do in Horndean
How we quote for new build mastic
For a quick quote, just ask. What matters most is:
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
- Whether the work is at height
- The number and length of the joints
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re unsure, call 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- The problem you’ve noticed
- The address or postcode of the job
- Roughly how big the job is
- Pictures of the joints, sent by email
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or drop us an email.
Why deal with it now?
DIY kits don’t solve the main problems with new-build sealant: grit, unprimed surfaces and old layers underneath. Proper removal and preparation are what make it last. Black mould and gaps in sealant do not fix themselves, and in a busy household in Horndean they spread with every shower and every downpour. Replacing the sealant now is the simplest fix.
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 the work is at height. Your quote takes all of that into account.
What you get with us
- White, clear, grey or coloured to suit, where the product allows
- You choose the colour before work begins
- Every job guaranteed for a year
- 20+ years of sealant experience
Read what affects the cost or what customers say.
Joints and finishes in Horndean homes
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For new homes near Rowlands Castle station, it’s worth checking the sealant early, while snags are still fresh.
Horndean is about 7 miles north-east of Portsmouth, in Hampshire. If you need new build mastic in Horndean, please phone 0345 464 0079 or send us an email for a quick quote. We cover Hampshire from our Crawley base. 683 places in Hampshire are on our list, large and small. Our Portsmouth page covers work nearby, about 7 miles away.
Every address in PO8 and PO7 is within our area for new build mastic. Local streets include London Road, Kings Mede and Causeway Farm. With the A3 and A3(M) close by, Horndean is easy for our applicators to reach for new build mastic. Neighbouring places we cover for new build mastic include Lovedean (1 mile west), Wecock Farm (1 mile south-west), Catherington (2 miles north), Anmore (2 miles west) and Denmead (2 miles west). Larger places within reach include Gosport (9 miles south-west), Havant (3 miles south), Eastleigh (15 miles west), Fareham (9 miles south-west), Hedge End (13 miles west) and Petersfield (7 miles north-east). As one of the bigger places in Hampshire, Horndean has every kind of property, from flats to offices.
Near you in Horndean
In Horndean, that means homes and buildings near Horndean Infant School and Red Lion Inn. For rail, the closest station is Rowlands Castle station, roughly 2.6 miles south-east. Nearby you’ll also find Havant War Memorial Hospital (3.8 miles south) and Clanfield Earthwork (3 miles north-east). The countryside around Horndean includes Windmill Hill and Southmoor Nature Reserve.
Keeping the joints in good condition
No joint lasts for ever, but care makes a real difference. A few tips:
- Ventilate bathrooms well, especially in the first year
- Follow the cure time we give you
- Act quickly if a seal starts to leak
- Do not seal over failed sealant yourself
Ventilation matters in a new home, which is still drying out. Use the extractor fan or open a window after showers to help keep mould away.
The sooner you deal with untidy or cracking sealant, the less there is to put right. Left alone, a small crack can become a leak in a busy bathroom.
When to call us in Horndean
A new house holds a lot of water from the build, which takes a year or two to dry out. Drying timber shrinks and pulls joints apart and the sealant has to cope with the movement.
These are the problems we are asked about most:
- Untidy sealant flagged on a snagging list
- Cracked sealant around new window and door frames
- Skirting joints opening in the first winter
- Sealant work across a run of new homes
In and around Horndean, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Questions to ask before you book
- How the joint is cleaned and prepared
- What guarantee comes with the work
- Whether all the old sealant comes out first
- Which colour the sealant will be
What happens on the day
There’s no need to move everything out before we come, only the area right around the joints. Everything nearby is protected, and the job takes anything from a few hours to several days, depending on the number of plots in most cases. In Horndean, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- Each joint is checked for movement before we start.
- 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
- Clear the area around the work
- Mention any sign-in or site rules at work premises
- Let us know about parking restrictions
Get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Read more
How the job changes by surface
Bathrooms and en suites
Trays and baths in new builds settle as they’re used. The joint is stripped back before the new bead goes in.
Skirting and floors
Gaps under skirting are one of the most common new-build snags. We seal it with a flexible sealant that copes with the movement.