Southampton · England

Rownhams Sand Mastic

Professional sand mastic in and around Rownhams, with every bit of old sealant taken out first and a 12-month guarantee.

Tired mastic found when preparing windows for paint
Draughts and rain around sash boxes
Modern sealant on a period surround

Sand mastic in Rownhams

Call 0345 464 0079

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Sand mastic in Rownhams, done properly

If your home is listed or in a conservation area, check with your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. If you have modern sealant on a period surround and window mastic to renew ahead of painting, we can help, whatever the surface.

Around Rownhams, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.

We stand behind the work with a 12-month guarantee, so you’re covered after we’ve gone.

Mr Mastic applicator sealing the top of a white uPVC door frame on a red-brick house

Where: Rownhams (SO16)
Region: Southampton
Cover: A year, on every job
Quote: Quoted before any work starts
Phone: 0345 464 0079
Last updated: 26 October 2026

For landlords and businesses

A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.

For anyone letting property in or around Rownhams, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.

What affects the cost of sand mastic

Every job gets its own quote. These are the things that affect it:

How many rooms, windows or areas are involved
Any working-time requirements on site
The type of sealant required
The size of the job

We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.

Asking for a quote

When you call or email, it’s useful to know:

Whether it has been sealed before
How we’d reach the joints
If it’s domestic, commercial or a hotel
What’s wrong with the joints now

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.

Different surfaces, different methods

Stone surrounds

The stone is treated with care when the old mastic comes out.

Timber door frames

Period doors in stone or brick openings are often pointed with sand mastic. We renew it the same way as on windows.

Frames and glazing around Rownhams

Rownhams is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. 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.

Rented homes near Redbridge station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. For site and facilities teams at buildings such as Rownhams St John's Church of England Primary School, its window and door frames need their mastic kept sound, just like a home’s.

Rownhams is about 3 miles north-east of Totton, in Southampton. Homes, rented property, offices and hotels in Rownhams can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Our area takes in 40 places across Southampton, from the larger towns to small villages.

We work across the SO16 postcode area for sand mastic. If you need sand mastic at a property on Rownhams Way, Horns Drove and Rownhams Close or anywhere close by, we can help. Nearby, we also carry out sand mastic in Upton (1 mile west), Nursling (1 mile south-west), Hillyfields (1 mile south-west), Lordswood (1 mile south-east) and Toothill (1 mile north-west). Further out, we also cover Southampton (3 miles south-east), Townhill Park (4 miles east), Midanbury (4 miles east), Thornhill (6 miles south-east), Chartwell Green (5 miles east) and Harefield (5 miles south-east).

Landmarks near Rownhams

Locally, jobs take us to homes and businesses close to Oaklands Community School, St James' Park and Oasis Academy Lord's Hill. Rownhams’s nearest station is Redbridge station, roughly 2.1 miles south. Nearby you will also find Princess Anne Hospital (1.3 miles south-east) and Eling Experience (2.4 miles south-west). Not far away are Testwood Lakes.

Map of Rownhams © OpenStreetMap contributors

Why deal with it now?

Draughts round a sash window aren’t always the sashes. Open mastic joints round the box can let air in and new mastic seals them. Homes in smaller places like Rownhams can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.

No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.

Why us?

Full insurance on every job
Anti-fungal sanitary silicone in wet areas
Any old sealant cut out fully, not covered over
20+ years of sealant experience

Read how sealant jobs are priced and what customers say.

Keeping the joints in good condition

Looking after new joints is easy, and it makes a real difference:

Inspect the joints round the windows every year or so
Ask us before painting near the mastic
Keep sills and gutters clear so water drains away
Don’t run silicone over sand mastic

Make sure water drains away from the window surround. Constant wetting wears the mastic faster.

Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.

FAQs for Rownhams

Does the coastal weather in Rownhams affect outside sealant?

Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.

Do you work for landlords with property near Redbridge station?

Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.

Which products do you use?

The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.

Will the old sealant be removed?

Yes. All of the old material is cut out and the joint cleaned before applying anything new.

Can I paint the new mastic?

Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.

Can I add another job to the visit?

Yes. Tell us about everything you’d like done.

How do I get a quote for sand mastic in Rownhams?

It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or email us with a short description of the job.

Where are you based?

Mr Mastic is based in Crawley. Our applicators cover Rownhams.

The process

On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours for a single window, longer for several, including the tidy-up. A visit to Rownhams is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.

Each surround is checked first.
We rake out the old mastic and clean the joint.
We fill deep gaps so the new mastic isn’t too thick.
We point the joint with sand mastic by hand.
We finish the mastic to a tidy line.

How to prepare

On commercial sites, let us know about site rules
Tell us if parking is tricky
Mention any leaks or damp you’ve noticed

How to get a quote

Want a quote for sand mastic? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and give you a clear price before we start.

Get a quick quote