West Sussex · England
Sand Mastic in Southwater
Specialist sand mastic for Southwater: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Cement or filler used on old window joints that has cracked
- Mastic that needs renewing before redecorating
- Draughts and rain around sash boxes
Sand mastic for homes and businesses in Southwater
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder, applied by hand. On older homes, it suits the building far better than silicone. Common call-outs are for window mastic to renew ahead of painting and mastic dropping out of the joint, on tenement windows, period & listed homes and stone surrounds.
Around Southwater, conservatories, garden rooms and patio doors are often part of the house. Their glazing joints and frame seals are as much a part of the job as the windows.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Where
- Southwater (RH13)
- Region
- West Sussex
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It gives a traditional finish.
Period and listed homes
Materials matter on listed and conservation-area homes. Sand mastic is often the preferred finish.
Also near Southwater
What else we do in Southwater
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Keep modern sealant off the mastic
- Clear gutters so water does not pour onto the windows
- Plan mastic work ahead of painting
- Avoid heavy scraping on the mastic joint
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Good mastic helps keep the frame dry. Failed mastic lets water reach the timber, which can lead to rot.
Signs you need sand mastic in Southwater
Water gets into small cracks in the mastic and pushes it out. Windows facing the weather tend to go first.
People generally contact us after spotting one of these:
- Mastic that needs renewing before redecorating
- Wind and rain getting in round a sash window
- Silicone on a period window that looks wrong
- Open joints round the window box
If you look after a building such as Southwater Infant Academy, the mastic around its windows and doors needs looking after like any other building’s.
What to look for in a quote
- What happens if the job turns out different
- How the joint is cleaned and prepared
- Whether they’re fully insured
- Who does the work, and how experienced they are
Southwater questions
I let a flat near Christs Hospital station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Can you do sand mastic in Southwater?
Yes, Southwater is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we have agreed the job, you don’t need to watch us work.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first.
What information do you need?
Tell us what needs doing and where, with photos by email if possible. We’ll ask anything else we need to know.
Can you replace silicone on a period window with sand mastic?
Yes, it’s a common request. All the old silicone is removed first so the mastic can sit properly.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
For landlords and businesses
We work for letting agents and landlords as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
What affects the quote in Southwater
We don’t publish a price list, because jobs vary so much. What we look at:
- Working hours on commercial sites
- The number of rooms or windows
- Mould in or behind the old joints
- Which sealant suits the joint
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
Helping us quote
Before you ask for a quote, have a think about:
- Access, such as stairs, a lift or height
- Roughly how big the job is
- If someone has resealed it before
- Whether it’s a home or a business
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work before giving you a price.
What sand mastic looks like in Southwater
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Christs Hospital station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Homes close to Holy Innocents Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
Southwater is about 3 miles south of Horsham, in West Sussex. We carry out sand mastic for homeowners, landlords and businesses in Southwater. Our area takes in 371 places across West Sussex, large and small. There’s also a page for Crawley, about 9 miles away.
Our applicators cover all of RH13 for sand mastic. If you need sand mastic at a property on Station Road, Walmer Close and Pevensey Road or a nearby road, we can help. Other places close to Southwater include Tower Hill (2 miles north), Nuthurst (2 miles east), Brooks Green (2 miles west), Barns Green (2 miles west) and Maplehurst (2 miles south-east). Within a short drive, we also cover Crawley (9 miles north-east), Horsham (3 miles north), Worthing (14 miles south), Haywards Heath (11 miles east), Burgess Hill (11 miles south-east) and Shoreham-by-Sea (13 miles south).
Near you in Southwater
Around Southwater, our work takes us to homes and buildings near The Lintot pub and The Doyle School of Design and Technology. The closest station to Southwater is Christs Hospital station, about 1.9 miles north-west. Other landmarks nearby include Christs Hospital School Museum (1.5 miles north-west) and Horsham Hospital (3.2 miles north). For a walk, there’s Knepp Wildland.
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes anything from a few hours to a full day, depending on how many windows. A visit to Southwater 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.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Keep children and pets away from the work area
- Move anything stored near the joints
- Tell us about any water getting in
Get a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
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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. In an older home around Southwater, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
Why book with us
- A 12-month guarantee on all work
- Domestic, commercial and hotel work
- We’re fully insured
- Tidy, careful work
Take a look at how sealant jobs are priced and our reviews.