Windsor and Maidenhead · England
Glazing & conservatory sealant in Windsor, Windsor and Maidenhead
Glazing silicone for conservatories, rooflights, glass panels and shower screens for Windsor, backed by a 12-month guarantee. Ask us for a quote.
- Stained, discoloured glazing silicone
- Glass-to-glass joints that have split
- Rooflight joints letting water in
Why it’s worth doing now in Windsor
Leaks get worse, not better. Water can damage frames, walls, flooring and furniture so early action saves a bigger repair. Gaps in sealant and mould in the bead never get better on their own, and in a busy home in Windsor they get worse with every use. Now is the easy time to put it right.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and give you a clear price before any work starts.
Why choose Mr Mastic in Windsor
- Quality sealants from Arbo and Everbuild
- We never seal over old sealant
- A 12-month guarantee on all work
- Neat joints and a tidy finish
Read our cost guide and our reviews.
Glazing silicone in Windsor, done properly
A frameless shower screen depends on its silicone. The joint down the wall and the one along the tray are common leak points, and we reseal both. We work on glass balustrade bases, conservatory frames and shower screens, and the jobs we see most are new silicone smeared over old sealant and drips on the inside of a conservatory window.
Walls in Windsor that face the prevailing wind take the most weather, so the mastic there tends to fail first. Checking every frame, not just the obvious one, is time well spent.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Place
- Windsor (SL4)
- Region
- Windsor and Maidenhead
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
The work is kept neat and contained to the area we’re working on. Expect the work to take anything from an hour or two to most of a day, depending on the size of the job. Parking in a town like Windsor is generally straightforward, but tell us if there’s a driveway or any restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- First we agree the joints to be done.
- We cut away the failed silicone.
- We clean and prepare the joint.
- New glazing silicone goes in and is finished neatly.
- The joints are checked before we leave.
Before we arrive
- Let us know about earlier repairs to the joints
- Plan for the work area to be out of bounds to pets and children
- Clear the area around the work
Get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
Read more
What affects the cost of glazing silicone
Jobs vary more than people expect. What affects the quote:
- Whether the work is at height
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- When we can work, for business premises
The cost depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before work begins.
What we need to know
When you contact us, it’s useful to know:
- Any previous sealing or DIY work
- Any access issues, like height or stairs
- Roughly how big the job is
- The address or postcode of the job
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or email us.
Common questions in Windsor
Is Windsor in your area for glazing silicone?
Yes, Windsor is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
Can you help a landlord with a rental near Windsor & Eton Central station?
Yes. We work for landlords and letting agents as well as householders, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you guarantee glazing sealant work?
There’s a 12-month guarantee on every job, glazing sealant included.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we’re using and why.
Will the old sealant be removed?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Where do you work from?
Mr Mastic is based in Crawley. We cover Windsor and the rest of Windsor and Maidenhead, along with the rest of our area.
Are you fully insured?
Yes, we are fully insured for domestic and commercial work.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
If you manage several properties in or around Windsor, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
DIY versus a professional finish
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
When it isn’t the sealant
We will always be straight with you, so here’s what new sealant won’t do:
- Glass that needs replacing
- A sealed unit that has misted inside
- Water coming through the roof rather than a sealant joint
If you are not sure, just ring 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Windsor
- Rooflights
- Shower screens
- Glass-to-frame joints
- Conservatory frames
- Glass balustrade bases
- Glass-to-glass joints
Also in Windsor
Common problems we fix in Windsor
The wrong sealant is a common cause. Some products don’t bond well to glass, and acetoxy types can attack some frame materials.
Any of these means the joints need attention:
- Sealant that was laid over old silicone and failed
- Shower screens leaking along the wall or tray
- Rooflight joints letting water in
- Split or lifting silicone on glass
For site and facilities teams at buildings such as St Edward's Catholic First School, the mastic around its windows and doors needs looking after like any other building’s.
What your quote should include
- Is VAT in the price?
- The length of the guarantee
- Who turns up on the day
- How the surfaces are prepared before sealing
What glazing silicone looks like in Windsor
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as St Leonard's Hill (about 1 mile south-west) nearby, there’s older building stock in the area around Windsor 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’s traditional sand mastic.
If you live in an older home near All Saints Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Windsor & Eton Central station, leaking glazing joints, shower screens or conservatory seals are worth sorting between tenancies.
Windsor is about 3 miles south of Slough, in Windsor and Maidenhead. Jobs in Windsor get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Windsor is one of 57 towns and villages in Windsor and Maidenhead where we work. For nearby work, see our Reading page (15 miles or so).
Jobs for glazing silicone in SL4 works the same way as everywhere else we cover. You will find streets such as Athlone Square, Leigh Square and Furness Square. Main roads around Windsor include the A308 and A332, which makes travel easy. We also cover the places around Windsor: Clewer (1 mile north), Dedworth (1 mile west), Boveney (1 mile north-west), Eton Wick (1 mile north) and Oakley Green (1 mile west). We also work in nearby towns such as Maidenhead (5 miles north-west), Boyn Hill (5 miles north-west), North Ascot (5 miles south-west), Cookham (7 miles north-west), Furze Platt (6 miles north-west) and Broomhall (6 miles south). Being one of Windsor and Maidenhead’s larger places, Windsor has every kind of property, from flats to offices.
Local landmarks in Windsor
We work in homes and buildings around The Prince Albert pub, Windsor Girls' School and Sutherland Grange, among other places. Windsor’s nearest station is Windsor & Eton Central station, roughly 1 mile north-east. A little further out are Berkshire Yeomanry Museum (1 mile south-east) and Windsor Castle (1.3 miles east). Green spaces nearby include Bray Pit and Taplow Lake.