Southampton · England
Sand Mastic in Southampton
Sand mastic across Southampton and nearby, with every bit of old sealant taken out first.
- Draughts and rain around sash boxes
- Failed mastic on an exposed elevation
- Old sand mastic that has cracked, crumbled or fallen out
What affects the cost of sand mastic
You will get a clear quote before we start. It takes into account:
- The number of rooms or windows
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
- Access and height
Some things make a job bigger or smaller: the old material and how easily it comes out, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Asking for a quote
To make quoting easier, let us know:
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
- How we’d reach the joints
- Photos by email, if that’s easy
Asking for a quote is easy: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Sand mastic for homes and businesses in Southampton
Sand mastic skins over fairly quickly but full hardening takes longer. Traditionally, sand mastic is left unpainted and we’ll advise if you are redecorating. Typical jobs include open joints round the window box and mastic dropping out of the joint, across period & listed homes, timber door frames and stone surrounds.
Beyond its homes, Southampton has shopfronts, offices and flats with plenty of frames and glazing. Failed joints up there let in water that can go unnoticed for a while.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Place
- Southampton (SO19, SO16, SO15, SO18)
- Region
- Southampton
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Places near Southampton
What else we do in Southampton
Landlord and commercial work in Southampton
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
What the job involves on each surface
Brick reveals
Sand mastic is also used where timber frames meet brick. It gives a traditional finish.
Sash and case windows
A sash window’s box frame sits in the masonry opening. The gap round it is pointed with sand mastic.
Windows and doors in Southampton
Southampton is within about 2 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around older windows and doors, especially on the side facing the sea. With historic houses such as Southampton Tudor House and Garden (about 1.4 miles south) nearby, there’s older building stock in the area around Southampton as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Schools such as Bevois Town Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. In the older streets around Saint Mary's, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Southampton is in England. Across the SO19 area, our applicators can take on sand mastic. We cover 40 towns and villages across Southampton.
Postcode districts we cover here for sand mastic: SO19, SO16, SO15 and SO18. That includes homes and businesses on London Road, Marshall Square and Grosvenor Square and the roads around them. Southampton is on the A27 and A33, so it’s easy for us to get to. Neighbouring places we cover for sand mastic include Inner Avenue (1 mile west), St Denys (1 mile north-east), Bitterne Manor (1 mile east), Portswood (1 mile north) and Northam (1 mile south-east). Within a short drive, we also cover Maybush (3 miles west), Eling (4 miles west), Rownhams (3 miles north-west), Hounsdown (5 miles west), Nursling (4 miles north-west) and Hillyfields (3 miles west).
Landmarks near Southampton
Typical jobs here are in homes near Rockstone Place Park, The Hobbit pub and St Mary's Independent School, among other places. There’s a railway station in Southampton itself: St Denys station. A little further out are Marlands Shopping Centre (1 mile south-west) and R J Mitchell Museum (0.9 miles south-west). For a walk, there’s Netley Common.
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Leave it or put it right?
Not every draught comes from the sashes themselves. Gaps between the frame and the wall can be just as bad and new mastic seals them. In a busy place like Southampton, a failed joint in a flat or office can send water into the space below, where it’s often found late and is bigger to put right.
Rather than a set price list, 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.
Why us?
- We’re fully insured
- 180+ five-star Google reviews
- ARBOMaster approved applicator
- We never seal over old sealant
See our cost guide and our reviews.
Southampton: your questions answered
Is sand mastic in a coastal place like Southampton any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do you work for landlords with property near St Denys station?
Yes, we work for landlords and agents. You can phone 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.
Do you have insurance?
Yes. We’re fully insured.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
Can you work on commercial sites?
Yes. We can plan bigger jobs in stages to suit the site.
What guarantee comes with the work?
Every job comes with our 12-month guarantee, and we’re fully insured.
How long does sand mastic take?
It depends on the size of the job, but most jobs take anything from a few hours to a full day, depending on how many windows. We will tell you when we quote.
Is it messy?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we are done.
What we do, step by step
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to a full day, depending on how many windows. In central Southampton, parking can be tight, so tell us about driveways, permits or nearby car parks. For flats, mention stairs, lifts and shared entrances as well.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any parking rules near the property
- Let us know about stairs, lifts or work at height
Get a quote
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Advice
Common problems we fix in Southampton
Rain on the window surround works into any crack and loosens it further. Windows facing the weather tend to go first.
The problems people normally mention when they call are:
- Cement or filler used on old window joints that has cracked
- Failed mastic on an exposed elevation
- Gaps where the frame meets the masonry
- Draughts and rain around sash boxes
Rented homes near St Denys station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Comparing quotes
- The length of the guarantee
- How long to leave it before use
- What preparation is included
- What the quote includes, VAT included or not