Isle of Wight · England
Window & door mastic in St Lawrence, Isle of Wight
Window mastic in St Lawrence from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cracked sealant at the sill ends
- Sealant in the wrong colour for the frame
- Cold air getting in at the frame edge
How we handle window mastic in St Lawrence
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. We work on window sills, aluminium frames and uPVC windows, and the jobs we see most are mastic that has split away from the wall and leaking joints at the ends of sills.
Mastic can only go onto a dry, clean joint, so window work in St Lawrence is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Big or small, it’s backed by our 12-month guarantee in St Lawrence and across the Isle of Wight.
- Place
- St Lawrence (PO38)
- Wider area
- Isle of Wight
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
A quick bead over the top of old mastic looks like an easy fix, but it will not grip old, dirty sealant. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. 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.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or email us.
Why us?
- You choose the colour before work begins
- We leave the area clean and tidy
- We’re fully insured
- Sealant colour chosen to suit
Take a look at our cost guide or our reviews.
Other services in St Lawrence
Frames and glazing around St Lawrence
St Lawrence 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. That’s hard on the mastic around window and door frames, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St Lawrence's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you look after a building such as St Francis Catholic and Church of England Primary Academy, the mastic around its windows and doors needs looking after like any other building’s.
St Lawrence is about 4 miles south-west of Shanklin, in the Isle of Wight. We carry out window mastic for homes and businesses in St Lawrence. Our the Isle of Wight coverage runs to 125 places, St Lawrence among them. You can also see our page for Portsmouth, about 17 miles away.
All of PO38 is covered for window mastic. Window mastic is available to properties on Twining Road, Whitwell Road and Woolverton Road and the roads around them. We also cover the places around St Lawrence: Steephill (1 mile east), Nettlecombe (1 mile north-west), Whitwell (1 mile north-west), Ventnor (1 mile east) and Bierley (2 miles north-west). Within a short drive, we also cover 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). If you’re somewhere remote, a little more planning is needed, so let us know when you get in touch.
Near you in St Lawrence
Around St Lawrence, our work takes us to homes and buildings near St Catherine's School and the streets around them. The nearest railway station is Shanklin station, about 4.1 miles north-east of the centre. 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.
FAQs for St Lawrence
Is window mastic in a coastal place like St Lawrence any different?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. Walls facing the sea are normally the first to need attention.
Do you work for landlords with property near Shanklin station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
How much does window mastic cost in St Lawrence?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
What information do you need?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Do you cover St Lawrence?
We do. St Lawrence is part of the area we cover.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Do you have sealant for grey or black windows?
Yes. White, brown, anthracite grey, black and clear sealants are all available, so the joint suits the frame.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in St Lawrence and across the Isle of Wight. Several sites can be quoted together, and we’re fully insured.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Do you need window mastic in St Lawrence?
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. When that sealant fails, water gets into the wall or under the frame.
People normally contact us when they notice something like this:
- Draughts coming in around windows and doors
- Leaking joints at the ends of sills
- Hard, cracked sealant around windows
- Damp patches on the reveal after heavy rain
Rented homes near Shanklin station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Comparing quotes
- The length of the guarantee
- How much experience the applicator has
- Whether VAT is included
- How the colour is chosen
Quotes for window mastic in St Lawrence
Call for a quick quote. What matters most is:
- The number and length of the joints
- Any working-time requirements on site
- Whether the work is at height
- The number of rooms or windows
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Asking for a quote
To help us quote quickly, let us know:
- Whether it’s a home or a business
- The rough size of the job
- Any previous sealing or DIY work
- Where the property is
Want a quote for window mastic? Please call 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
How the visit works
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the work takes anything from an hour or two to a full day, depending on how many frames there are for a typical job. Somewhere as small as St Lawrence, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Before we arrive
- Mention any sign-in or site rules at work premises
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work and give you a clear price.
Advice
What the job involves on each surface
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. The bead is colour-matched to the frame.
Patio & French doors
Door frames take knocks and movement every time the doors are used. A flexible sealant copes with that without cracking.