Southampton · England
Sand mastic for sash & case windows in Itchen, Southampton
Window and door surrounds in Itchen need attention? We cut out the old, prepare the joints and apply the right sealant.
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Draughty sash windows at the surround
How we quote for sand mastic
You will get a clear quote before any work starts. It’s based on:
- How many areas need sealing
- Mould in or behind the old joints
- Working hours on commercial sites
- How much there is to do
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Helping us quote
You don’t need to know the technical terms. Just tell us:
- Whether it has been sealed before
- The rough size of the job
- What’s wrong with the joints now
- Photos by email, if that is easy
If you are in Itchen and need sand mastic, call 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
How we handle sand mastic in Itchen
Traditional burnt sand mastic that sits naturally against stone and brick. It’s a good fit for period properties where a modern sealant bead would stand out. If you have open joints round the window box and a silicone bead on a sash window that spoils the look, we can put it right.
Homes around Itchen range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
Your job is guaranteed for a year, as with all our work.
- Location
- Itchen (SO19, SO14)
- Region
- Southampton
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours per window, depending on the condition of the joints, including the tidy-up. For a job in Itchen, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First we agree which joints need doing.
- Old mastic and any loose material are raked out.
- Deep gaps are packed so the mastic sits at the right depth.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Getting ready for the visit
- Clear items away from the joints we’re working on
- Mention if the joints have been sealed before
- Plan for the work area to be out of bounds to pets and children
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, call 0345 464 0079 or send us an email.
Advice
Other services in Itchen
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
When to call us in Itchen
Shallow joints are a common cause. Mastic that is too thin cracks and drops out so we make sure the new mastic is the right thickness.
Common reasons people contact us are:
- Open joints round the window box
- Old cement repairs round a window that have failed
- Mastic dropping out of the joint
- Mastic round period door frames that has failed
Managing a site like Ludlow Junior School? Then its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before booking
- Which colour the sealant will be
- Is the old sealant removed completely?
- What happens if they find a problem under the old sealant
- How the joint is cleaned and prepared
Landlords, agents and businesses in Itchen
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.
In hotels, rooms out of use cost money, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
What we cannot put right
In fairness, some problems need a different trade:
- Sashes that rattle, stick or will not open
- Masonry that needs repairing
- Planning or listed building consent (your local planning authority decides)
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- Sash and case windows
- Brick reveals
- Stone surrounds
- Timber door frames
- Period & listed homes
- Tenement windows
What the job involves on each surface
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Frames and glazing around Itchen
Itchen is within about 1 mile of 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. With historic houses such as Medieval Merchant's House (about 1.5 miles west) nearby, there’s older building stock in the area around Itchen as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
For an older house near a landmark such as Jesus Chapel - St Mary Extra, the joint between an old wall and a newer frame is usually the first place rain gets in. Rented homes near Woolston station change hands often, and any sash windows need sound mastic to keep draughts and rain out.
Itchen is about 2 miles south-east of Southampton, in Southampton. Homes, rented property, offices and hotels in Itchen can book us for sand mastic. Every job comes with our 12-month guarantee. 40 places in Southampton are on our list.
Jobs for sand mastic in SO19 and SO14 works the same way as everywhere else we cover. Whether your property is on Sea Road, Oak Road and West Road or a nearby road, we can help. Itchen sits on or near the A3025. Neighbouring places we cover for sand mastic include Peartree Green (1 mile north-west), Northam (1 mile north-west), Sholing (1 mile east), Bitterne (1 mile north-east) and St Mary's (1 mile west). Further out, we also cover Shirley (3 miles north-west), Regents Park (3 miles west), Maybush (4 miles north-west), Coxford (4 miles north-west), Freemantle (3 miles west) and Lordswood (4 miles north-west). As one of the bigger places in Southampton, Itchen has homes, rented property and businesses of every kind.
Around Itchen
We work in homes and buildings around Houndwell Park, Woolston School and Oasis Academy Sholing, among other places. There’s a railway station in Itchen itself: Woolston station. A little further out are Bitterne Local History Society Heritage And Research Centre (0.9 miles north) and Marlands Shopping Centre (1.6 miles west). Open spaces near Itchen include Netley Common.
Itchen questions
Do you work for landlords with property near Woolston station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Is sand mastic in a coastal place like Itchen any different?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. Walls facing the sea are normally the first to need attention.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and the area is left clean when we finish.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can you replace silicone on a period window with sand mastic?
In most cases. We remove the silicone and clean the joint, then point it with sand mastic.
Will the old sealant be removed?
Yes, always, and completely. New silicone does not stick to old silicone, so the joint is cleaned back first.
How long does the job take?
That depends on how much there is to do, but most jobs take a few hours per window, depending on the condition of the joints. We’ll give you a better idea when we quote.
What does sand mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or email us with a short description of the job.