Hertfordshire · England
Glazing & conservatory sealant in Shenley, Hertfordshire
Glazing joints in Shenley need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Leaks where conservatory glass meets the frame
- New silicone smeared over old sealant
- Water running down inside the glass
Glazing silicone for homes and businesses in Shenley
Cracked, stained or lifting silicone on glass looks poor and can leak. We remove it without scratching the glass or frame before the new bead goes in. We work on glass balustrade bases, conservatory frames and rooflights, and people most often call us about leaks where conservatory glass meets the frame and cracked silicone between glass panels.
Homes around Shenley range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
You are covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or drop us an email.
- Place
- Shenley (WD7)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Shenley homes and the weather
With historic houses such as Wyllyotts Manor (about 4.1 miles east) nearby, there’s older building stock in the area around Shenley as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
Schools such as Shenley Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. For an older house near a landmark such as Church of St Martin, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Shenley is about 2 miles north of Borehamwood, in Hertfordshire. Across the WD7 area, our applicators can take on glazing silicone. Our area takes in 381 places across Hertfordshire, from the larger towns to small villages. Our London page covers work nearby (16 miles or so).
All of WD7 is covered for glazing silicone. If you need glazing silicone at a property on London Road, Southerton Way and Juniper Gardens or a nearby road, our applicators can take on the job. You will find Shenley on the B5378, so it’s easy for us to get to with everything needed for glazing silicone. Neighbouring places we cover for glazing silicone include Green Street (1 mile south-east), Ridge (2 miles east), Well End (2 miles south-east), Borehamwood (2 miles south) and South Mimms (2 miles east). Further out, we also cover Watford (5 miles south-west), Hemel Hempstead (8 miles north-west), St Albans (4 miles north-west), Welwyn Garden City (8 miles north-east), Harpenden (9 miles north) and Hoddesdon (12 miles east).
Local landmarks in Shenley
We work in homes and buildings around Manor Lodge School, Hertswood Academy and The Black Lion pub. For rail, the closest station is Radlett station, roughly 1.4 miles south-west of the centre. Nearby you’ll also find Radlett and District Museum (1.5 miles south-west) and Shenley Hospital (within half a mile west). For a walk, there’s Verulamium Lake and Broad Colney Lakes.
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Looking after it afterwards
After the cure time, these simple habits help:
- Keep air moving in the conservatory
- Use a gentle glass cleaner and a soft cloth
- Get a new leak looked at quickly
- Keep conservatory gutters clear of leaves
Follow the cure time we give you before the joints get wet so the silicone can set properly. After that, clean glass with a mild cleaner.
Act on black or lifting silicone early. Once it starts to peel, water gets behind it and the problem grows.
What we’re called out for in Shenley
On shower screens, constant water and cleaning products wear silicone. Mould gets into it and the joint starts to lift.
People normally contact us when they notice something like this:
- Water escaping where a screen meets the wall
- Stained, discoloured glazing silicone
- Sealant that was laid over old silicone and failed
- Conservatory leaks at frame and glazing joints
If you let a flat or house near Radlett station, leaking glazing joints, shower screens or conservatory seals are worth sorting between tenancies.
What to look for in a quote
- Whether VAT is included
- Who turns up on the day
- What insurance they hold
- Whether all the old sealant comes out first
DIY versus a professional finish
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What sealant work can’t fix
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- A sealed unit that has misted inside
- Leaks from the roof covering or flashing (a roofer’s job)
- Rotten or badly damaged frames
If you’re not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before booking.
Where we work in Shenley
- Glass-to-frame joints
- Glass-to-glass joints
- Shower screens
- Glass balustrade bases
- Conservatory frames
- Rooflights
What happens if it’s left?
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. Around Shenley, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
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. Call for a quick quote and we will explain what it covers.
Why choose Mr Mastic in Shenley
- Sanitary silicone with an anti-fungal additive in wet areas
- Any old sealant cut out fully, not covered over
- Arbo and Everbuild products
- A sealant colour to suit the surroundings
Take a look at our cost guide or our reviews.
FAQs for Shenley
Can you do glazing silicone in Shenley?
Yes, Shenley is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Will you come out to Shenley?
Yes. Shenley is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is it enough to run a bead over the old sealant?
It does not last. The new bead cannot grip the old one so we take it all out and start clean.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Is the work guaranteed?
Our one-year guarantee covers every job.
Do the sealants smell?
Sometimes, a little. It fades as the sealant cures.
Are you insured?
Yes. We’re fully insured, and we have been doing sealant work for more than 20 years.
Can you fix a leaking conservatory?
In many cases, as long as sealant is the cause. We trace the leak first, so you know what you are paying for.
How it works
Once we are 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 for most jobs. Parking around Shenley 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 start by finding the leak and making sure sealant is the cause.
- We cut out the failed silicone, taking care of the glass and frame.
- Surfaces are cleaned with a solvent suited to glass and the frame.
- We apply a neutral-cure glazing silicone and tool it smooth.
- The finished joints are checked and, where it’s safe, tested with water.
Preparing for the visit
- For indoor joints, keep the area dry beforehand if you can
- Mention any tricky access
- Keep pets and children clear of the area while we work
Ask for a quote
We quote each job on its own. Simply call 0345 464 0079 or send us an email and describe the job and send pictures if you have them.