Greater London · England
Glazing Silicone in High Barnet
Professional glazing silicone in and around High Barnet, with old sealant always removed completely and a 12-month guarantee.
- Rooflight joints letting water in
- Water tracking down the inner face of the glass
- Conservatory leaks at frame and glazing joints
When it isn’t the sealant
We will always be straight with you, so here’s what sealant can’t fix:
- A broken pane or roof panel
- Leaks from the roof covering or flashing (a roofer’s job)
- Frames that have decayed or split
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Glass-to-glass joints
- Shower screens
- Conservatory frames
- Glass-to-frame joints
- Rooflights
- Glass balustrade bases
How we handle glazing silicone in High Barnet
Many conservatory leaks come down to failed sealant at the glass-to-frame or frame-to-wall joints. We find the joint that is letting water in and renew it and tell you plainly if the cause is something else. Common call-outs are for sealant that was laid over old silicone and failed and shower screens leaking along the wall or tray, across rooflights, glass-to-frame joints and conservatory frames.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first.
Your job is guaranteed for a year, as with all our work.
- Place
- High Barnet (EN5)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Different surfaces, different methods
Glass-to-glass joints
Silicone joins glass panels in many frameless designs. We renew it with a clear or matching glazing silicone.
Rooflights
Rooflights get the full force of the weather. The sealant around the glass and frame wears faster than most.
Glazing silicone in High Barnet: local notes
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. With historic houses such as Wyllyotts Manor (about 2.9 miles north) nearby, there’s older building stock in the area around High Barnet as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Schools such as Foulds School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Hadley Wood station? Then a shower screen or conservatory joint that leaks is easier to reseal while the property is empty. Homes close to Christ Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
High Barnet is about 1 mile north-west of Barnet, in Greater London. If you need glazing silicone in High Barnet, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We are based in Crawley and cover Greater London, High Barnet included. Across Greater London, we cover 764 places, and High Barnet is one of them. London is on our list too, around 12 miles away.
Work in EN5 is quoted and booked the same way as anywhere else. We cover properties on Byng Road, Park Road and Kings Road and the roads around them. Main roads around High Barnet include the A1081, which makes travel easy. Other places close to High Barnet include Hadley (1 mile east), Arkley (1 mile south-west), Kitts End (1 mile north), Totteridge (1 mile south) and Rowley Green (2 miles west). Larger places within reach include London (12 miles south-east), City of Westminster (10 miles south), Marylebone (10 miles south), Kensington (11 miles south), St Pancras (10 miles south-east) and Shoreditch (11 miles south-east).
Around High Barnet
Typical jobs here are in homes near Susi Earnshaw Theatre School, The White Lion pub and Queen Elizabeth's School and the streets around them. For rail, the closest station is Hadley Wood station, roughly 1.6 miles north-east. Nearby you will also find Spires Shopping Centre (less than half a mile east) and Barnet General Hospital (0.5 miles south-west). The countryside around High Barnet includes Barnet Countryside Centre and Darland's Lake.
For landlords and businesses
If you manage several properties in or around High Barnet, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
Letting agents and landlords in High Barnet can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
Should I try it myself first?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, 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 the visit works
Once we’re on site, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes a few hours, depending on how many joints need doing. In High Barnet, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at the glazing and agree which joints need resealing.
- Old sealant is removed from the glass and frame.
- We clean and prepare the joint.
- We apply and tool the new silicone.
- The joints are checked before we leave.
How to prepare
- Mention any tricky access
- Mention any parking rules near the property
- Let us know about earlier repairs to the joints
Getting a quote
We don’t publish a price list, because every job is different. Instead, we give you a clear price for your job. To get started, call 0345 464 0079 or drop us an email.
Advice
What happens if it’s left?
You do not need new glazing because the sealant has gone. If the glass and frame are sound, new silicone is often all it takes, and we’ll tell you if that’s not the case. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in High Barnet.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we’ll go through it with you.
Why choose Mr Mastic in High Barnet
- Sanitary silicone with an anti-fungal additive in wet areas
- Rated 4.9 stars on Google
- We never seal over old sealant
- Trusted Arbo and Everbuild sealants
Your questions about glazing silicone in High Barnet
Is parking a problem for a job in High Barnet?
Parking in High Barnet, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
I let a flat near Hadley Wood station. Can you help?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Do you replace glass?
Glass replacement is not our trade. We look after the sealant joints, and we’ll tell you if a unit looks like it has failed.
Can you fix a leaking conservatory?
That depends where the water is getting in. Failed glazing and frame joints can be resealed but roof and panel problems need another trade.
Do you hold any approvals?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Can you do several jobs on one visit?
Yes. Just list everything you need.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
Quotes for glazing silicone in High Barnet
The quote reflects the job in front of us. We take into account:
- Access and height
- Whether there’s mould to deal with
- The number and length of the joints
- Whether old sealant or filler has to be cut out
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Asking for a quote
When you contact us, these details help:
- What the problem is, such as mould, gaps, leaks or cracking
- The address or postcode of the job
- The rough size of the job
- If it’s domestic, commercial or a hotel
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will explain what’s involved and give you a clear quote.