Hertfordshire · England
Glazing Silicone in Radlett
Glazing silicone in Radlett from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Water getting into a conservatory at the joints
- Black or yellowed silicone on glass joints
- Water tracking down the inner face of the glass
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- A sealed unit that has misted inside
- Frames that have decayed or split
- Cracked or broken glass
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
Surfaces we seal
- Glass-to-frame joints
- Rooflights
- Shower screens
- Conservatory frames
- Glass balustrade bases
- Glass-to-glass joints
Glazing silicone in Radlett
Sealant on glazing doesn’t last for ever. Sun, rain and movement wear it down, and once it cracks, water follows. Renewing it keeps glazing joints doing their job. We work on glass-to-glass joints, conservatory frames and glass-to-frame joints, and the jobs we see most are leaks where conservatory glass meets the frame and leaking glazing joints on a rooflight.
Houses in smaller places like Radlett can stand more in the open than those in a built-up town, so exposed windows and doors face the weather head on. That’s hard on the mastic around frames and sills.
Our work is backed for twelve months, in Radlett and everywhere else we cover.
- Location
- Radlett (WD7)
- Region
- Hertfordshire
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for glazing silicone
Call for a quick quote. What matters most is:
- How many rooms, windows or areas are involved
- The number and length of the joints
- When we can work, for business premises
- Whether the work is at height
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Asking for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- How many joints, rooms or windows are involved
- The problem you’ve noticed
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or email us with the details, and photos are welcome.
Landlords, agents and businesses in Radlett
Housing providers, facilities teams and property managers book us too in Radlett and across Hertfordshire. We can quote a run of properties together.
For anyone letting property in or around Radlett, several properties can be quoted together. Send us the addresses and the work at each.
Nearby places to Radlett
Also in Radlett
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
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.
Radlett homes and the weather
Historic houses like High Elms Manor (about 3.3 miles west) are a reminder that the area around Radlett has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Radlett station, glazing joints are worth checking at the end of a tenancy, before a small leak grows. If you look after a building such as St John's Church of England Infant and Nursery School, the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near St John, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Radlett is about 3 miles north-west of Borehamwood, in Hertfordshire. From the centre of Radlett to the outskirts, we cover glazing silicone for every kind of property. Radlett is one of 381 towns and villages in Hertfordshire we cover for glazing silicone. There’s also a page for London, about 16 miles away.
Every address in WD7 is within our area for glazing silicone, from the main roads to the quietest streets. You’ll find streets such as Upper Station Road, Station Road and Barn Close, and we cover them all. You’ll find Radlett on the B462 and A5183, so it’s easy for us to get to. Close by, we work in Kemprow (1 mile west), Round Bush (1 mile south-west), Letchmore Heath (1 mile south-west), Aldenham (2 miles south-west) and Patchetts Green (2 miles south-west). Further out, we also cover Watford (4 miles south-west), Hemel Hempstead (8 miles north-west), St Albans (5 miles north), Welwyn Garden City (10 miles north-east), Harpenden (9 miles north) and Hoddesdon (14 miles east).
Around Radlett
Typical jobs here are in homes near The Cat And Fiddle Public House. Radlett has its own railway station: Radlett station. Well-known places in the area include Radlett and District Museum (within half a mile south-east) and Harlequin Centre (3.7 miles south-west). Green spaces nearby include Verulamium Lake and Broad Colney Lakes.
What happens on the day
At the end, we look at the finished work together. The work normally takes a few hours, depending on how many joints need doing, depending on how much there is to do. Parking around Radlett is generally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We trace the leak and confirm it’s a sealant joint.
- The failed silicone is cut out without marking the glass or frame.
- We clean the glass and frame so the new silicone bonds.
- A neutral-cure glazing silicone is applied and tooled.
- We check the finished joints and test with water where it’s safe.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Mention any leaks or damp you’ve noticed
- Let us know about parking restrictions
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, ring 0345 464 0079 or send us an email.
Read more
Why it’s worth doing now in Radlett
Replacing a conservatory roof is major work. If the leak is a failed sealant joint, resealing is far simpler. If the roof is the problem, we will say so. Homes in smaller places like Radlett can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
Commercial jobs are quoted on the same basis as homes: 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 explain what it covers.
Why Radlett customers choose us
- We never seal over old sealant
- Quality sealants from Arbo and Everbuild
- You choose the colour before work begins
- Every job guaranteed for a year
Read our cost guide and customer reviews.
Radlett questions
Do you cover smaller places like Radlett?
Yes, we do. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you work for landlords with property near Radlett station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Where is Mr Mastic based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
How to look after the new joints
To keep the joints looking good and working properly:
- Look over the glazing joints once a year
- Avoid strong solvents on or near the sealant
- Clear the conservatory gutters regularly
- Wipe the screen down after showering
Look over the glazing joints every year or so. Catching a split early keeps the repair small.
A leaking shower screen may not show at first. Water can soak into the floor or reach the room below long before you see it.