Isle of Wight · England
Sand mastic for sash & case windows in St Lawrence, Isle of Wight
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for St Lawrence, backed by a 12-month guarantee. Ask us for a quote.
- Gaps round a timber door in stone or brick
- Silicone on a period window that looks wrong
- Mastic that needs renewing before redecorating
Leave it or put it right?
An open joint round the frame lets weather in. Water can get to the frame and the masonry so renewing it early protects the window. Older cottages and farmhouses around St Lawrence can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
Why us?
- Tidy, careful work
- Anti-fungal silicone where joints get wet
- Experience in homes, commercial sites and hotels
- Any old sealant cut out fully, not covered over
See what affects the cost and our reviews.
Sand mastic for homes and businesses in St Lawrence
We renew sand mastic around sash windows and doors in stone and brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. We are often asked to deal with modern sealant on a period surround and tired mastic found when preparing windows for paint, on tenement windows, stone surrounds and timber door frames.
Around St Lawrence, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- St Lawrence (PO38)
- Wider area
- Isle of Wight
- Cover
- One year on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
When to call us in St Lawrence
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber and we normally remove them.
If you can see any of these, it’s time to have the joints looked at:
- Gaps between timber frames and stone or brick
- Patchy fillers round a sash window
- Weathered mastic on the most exposed windows
- Mastic dropping out of the joint
In the older streets around St Lawrence's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- How long to leave it before use
- Whether VAT is included
- Who turns up on the day
- Which colour the sealant will be
Quotes for sand mastic in St Lawrence
For a quick quote, just ask. The main things that affect it are:
- The type of sealant required
- How easy the joints are to reach
- The old material and how stubborn it is
- Any mould that needs treating
We don’t 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.
Helping us quote
To make quoting easier, let us know:
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
- How we’d reach the joints
- The problem you’ve noticed
Getting a quote is simple: let us know what needs doing and where and its rough size. Photos by email help us understand the job.
Your questions about sand mastic in St Lawrence
Do you work for landlords with property near Shanklin station?
Yes. We work for letting agents and landlords as well as householders. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Is sand mastic in a coastal place like St Lawrence 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.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Like-for-like sand mastic is often the preferred finish, but they decide.
What does sand mastic cost?
Every job is different, so each one gets its own quote. To get one, ring 0345 464 0079 or send us an email and tell us what needs doing and where.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can you match the sealant colour?
Yes. White, clear and grey are common, and other colours are available, and we agree the colour with you before any work starts.
Also in St Lawrence
For landlords and businesses
If you manage several properties in or around St Lawrence, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Avoid heavy scraping on the mastic joint
- Renew mastic before redecorating the windows
- Find out about consent before window work on a listed home
- Make sure water runs off the sill
Leave the new mastic alone while it firms up. It skins over quickly but needs longer to fully harden.
Sound mastic protects the frame. Once it fails, water can sit against the timber and timber that stays wet can rot.
Windows and doors in St Lawrence
St Lawrence is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. 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 Rylstone Manor (about 3.8 miles north-east) nearby, there’s older building stock in the area around St Lawrence as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as St Francis Catholic and Church of England Primary Academy are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Shanklin station? Then older sash windows in a rental need their mastic kept sound to keep the weather out.
St Lawrence is about 4 miles south-west of Shanklin, in the Isle of Wight. If you need sand mastic in St Lawrence, please ring 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover the Isle of Wight. St Lawrence is one of 125 towns and villages in the Isle of Wight where we work for sand mastic. We also work in Portsmouth, around 17 miles away.
Postcode districts we cover here for sand mastic: PO38. We cover properties on Twining Road, Whitwell Road and Woolverton Road. Other places close to St Lawrence include Steephill (1 mile east), Nettlecombe (1 mile north-west), Whitwell (1 mile north-west), Ventnor (1 mile east) and Bierley (2 miles north-west). Larger places within reach include Newport (8 miles north), Ryde (10 miles north), Cowes (12 miles north), Sandown (6 miles north-east), Shanklin (4 miles north-east) and East Cowes (12 miles north). Island and remote addresses take a little more planning, so tell us where you are when you ask for a quote.
What’s near St Lawrence
Typical jobs here are in homes near St Catherine's School, among other places. For rail, the closest station is Shanklin station, about 4.1 miles north-east. A little further out are Arthur Webster Memorial Hospital for Children (4.1 miles north-east) and Longshoremans Museum (1.3 miles east). Green spaces nearby include Stenbury Down.
Different surfaces, different methods
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.
Sash and case windows
On a sash window, the mastic joint shows on the outside so we finish it carefully.
What happens on the day
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes anything from a few hours to a full day, depending on how many windows. Somewhere like St Lawrence needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- Let us know about earlier repairs to the joints
- Mention any tricky access
- Clear the area around the work
How to get a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.