Southampton · England
Sand Mastic in Portswood
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Portswood, backed by a one-year guarantee. Call for a quick quote.
- Mastic that needs renewing before redecorating
- Old sand mastic that has cracked, crumbled or fallen out
- Old cement repairs round a window that have failed
Sand mastic for homes and businesses in Portswood
Traditional burnt sand mastic blends with stone and brick surrounds. It’s a good fit for period properties where a modern sealant bead would stand out. We work on sash and case windows, stone surrounds and tenement windows, and the jobs we see most are tired mastic found when preparing windows for paint and draughts and rain around sash boxes.
Homes around Portswood 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.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Portswood (SO17, SO14, SO18)
- Region
- Southampton
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in Portswood
For anyone letting property in or around Portswood, several properties can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
Portswood: your questions answered
Will you come out to Portswood?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
I let a flat near St Denys station. Can you help?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear price.
How much does sand mastic cost in Portswood?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before we start.
How long does sand mastic take?
As a guide, most jobs take a few hours for a single window, longer for several. Bigger jobs take longer, and we will tell you how long to expect.
Will it make a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Can you seal over the old sealant?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
What do you need from me for a quote?
A short description and the location, plus photos if you have them. If we need more, we’ll ask.
Looking after it afterwards
Looking after new joints is easy:
- Plan mastic work ahead of painting
- Don’t run silicone over sand mastic
- Get any rot dealt with first
- Ask the planning authority about consent for listed or conservation-area homes
Leave the new mastic unpainted, as traditional guidance advises. If you are redecorating, ask us first.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Towns and villages near Portswood
Also in Portswood
Windows and doors in Portswood
Portswood is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Historic houses like South Stoneham House (about 1 mile north-east) are a reminder that the area around Portswood has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Rented homes near St Denys station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. Schools such as St Denys Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Portswood is about 1 mile north of Southampton, in Southampton. We carry out sand mastic for householders, landlords and businesses in Portswood and the surrounding area, as part of our work across Southampton. Our Southampton coverage runs to 40 places, and Portswood is one of them.
Work in SO17, SO14 and SO18 is quoted and booked the same way as anywhere else. Local streets include Ivy Road, Alma Road and Lawn Road, and we cover them all. Portswood is on the A335 and A3035, which makes it straightforward to reach with everything needed for sand mastic. If you’re just outside Portswood, we cover St Denys (1 mile south-east), Southampton (1 mile south), Inner Avenue (1 mile south-west), Bitterne Manor (1 mile south-east) and Bitterne Park (1 mile east). Further out, we also cover Thornhill (3 miles south-east), Maybush (3 miles west), Eling (4 miles west), Rownhams (3 miles north-west), Millbrook (3 miles west) and Weston (3 miles south).
Around Portswood
In Portswood, that means homes and buildings near St Anne's Catholic School, St Mary's Independent School and South Western Arms, among other places. Portswood has its own railway station: St Denys station. Other landmarks nearby include Marlands Shopping Centre (1.5 miles south) and Royal South Hants Hospital (0.9 miles south). Open spaces near Portswood include Netley Common.
What happens on the day
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to a full day, depending on how many windows. In a smaller place like Portswood, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Mention if the joints have been sealed before
- Let us know if you’ve seen damp or leaks
- On commercial sites, let us know about site rules
How to get a quote
Need a quote? Please ring 0345 464 0079 or email us with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
How the job changes by surface
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is usually favoured.
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
When to call us in Portswood
Paint, silicone or cement used over old mastic causes problems. They do not move with the timber and we normally remove them.
Signs it’s time to call us include:
- Weathered mastic on the most exposed windows
- Mastic that needs renewing before redecorating
- Draughts and rain around sash boxes
- Cracked mastic round a front door frame
For an older house near a landmark such as Highfield Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before booking anyone
- The length of the guarantee
- How the joint is cleaned and prepared
- How the colour is chosen
- Whether VAT is included
Should I try it myself first?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How we quote for sand mastic
You’ll get a clear quote before work begins. It’s based on:
- The number and length of the joints
- How easy the joints are to reach
- The old material and how stubborn it is
- Whether there’s mould to deal with
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What we need to know
Before you ask for a quote, have a think about:
- The problem you’ve noticed
- The rough size of the job
- The type of property
- How we’d reach the joints
We do not publish a price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To get started, call 0345 464 0079 or send us an email.