Hertfordshire · England
Glazing Silicone in Old Knebworth
Professional glazing silicone in and around Old Knebworth, with old sealant always removed completely and a 12-month guarantee.
- Silicone pulling away from the glass
- Leaks from the base of a shower screen
- Water running down inside the glass
About our glazing silicone in Old Knebworth
Glass and frames expand and contract differently, so the sealant between them does a lot of work. When it cracks or lets go, water gets in. We replace it with a glazing silicone that suits the glass and frame. If you’re dealing with sealant that was laid over old silicone and failed and split or lifting silicone on glass, we can help, whatever the surface.
Around Old Knebworth, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Whatever the size of the job, it’s backed by our 12-month guarantee in Old Knebworth and across Hertfordshire.
- Place
- Old Knebworth (SG3)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Old Knebworth
Dirt and grease stop silicone sticking. Where the joint wasn’t cleaned and degreased, the bead can peel away early.
People normally contact us after spotting one of these:
- Glazing silicone that has cracked or come away
- Sealant that was laid over old silicone and failed
- Shower screens leaking along the wall or tray
- Failed sealant around rooflight glass
If you live in an older home near Church of St Mary and St Thomas, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- How the colour is chosen
- How long to leave it before use
- Whether all the old sealant comes out first
- What guarantee comes with the work
Surface by surface
Rooflights
Water around a rooflight isn’t always the sealant. We find the cause first.
Glass balustrade bases
We reseal the joint where the glass meets the base channel. We don’t install or replace glass.
Aftercare tips
After the cure time, these simple habits help:
- Keep scrapers and blades away from the silicone
- Check the gutters above the glazing for debris
- Use gentle products around the joints
- Wipe the screen down after showering
Check the joints once a year. Spotting a crack early means a simpler fix.
Conservatory leaks rarely stay small. Water runs along frames and down walls so it’s best dealt with right away.
What we can’t put right
Sealant is not the answer to every problem, and we’ll tell you before we start. Sealant won’t put right:
- Failed flashing around a conservatory
- A sealed unit that has misted inside
- Rotten or badly damaged frames
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Surfaces we seal
- Glass-to-frame joints
- Shower screens
- Glass balustrade bases
- Glass-to-glass joints
- Rooflights
- Conservatory frames
Nearby places to Old Knebworth
Other services in Old Knebworth
Old Knebworth homes and the weather
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 Knebworth House (about 0.2 miles north-west) nearby, there’s older building stock in the area around Old Knebworth as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
For landlords with property near Knebworth station, leaking glazing joints, shower screens or conservatory seals are worth sorting between tenancies. Managing a site like Barnwell School? Then its window and door frames need their mastic kept sound, just like a home’s.
Old Knebworth is about 3 miles south-west of Stevenage, in Hertfordshire. Every kind of property in Old Knebworth is covered for glazing silicone. The work is guaranteed for a year. 381 places in Hertfordshire are on our list, from the larger towns to small villages. London is on our list too, around 26 miles away.
Every address in SG3 is within our area for glazing silicone. If you need glazing silicone at a property on Old Knebworth Lane and Park Lane or anywhere close by, our applicators can take on the job. Other places close to Old Knebworth include Nup End Green (1 mile south-west), Driver's End (1 mile south-west), Rableyheath (1 mile south), Pottersheath (1 mile south) and Langley (2 miles north-west). Further out, we also cover Hemel Hempstead (13 miles south-west), Stevenage (3 miles north-east), St Albans (10 miles south-west), Welwyn Garden City (5 miles south), Harpenden (7 miles south-west) and Hitchin (6 miles north-west).
What’s near Old Knebworth
Locally, jobs take us to homes and businesses close to Knebworth Park and Robin Hood And Little John Public House and the streets around them. The nearest railway station is Knebworth station, roughly 1 mile east of the centre. A little further out are Lister Hospital (3.7 miles north) and Stevenage Museum (2.2 miles north). Open spaces near Old Knebworth include Mardley Heath.
What happens if it’s left?
Dealing with a leaking shower screen early protects the floor and ceiling. Water from a failed joint can soak into the floor before it shows. In a small place like Old Knebworth, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
What you pay reflects the work, not guesswork. That is why we ask about the job first.
What you get with us
- 4.9 on Google from 180+ five-star reviews
- Arbo and Everbuild products
- A 12-month guarantee on all work
- Full insurance on every job
Read our cost guide or what customers say.
Quotes for glazing silicone in Old Knebworth
Jobs vary more than people expect. The main factors:
- Access and height
- Whether there’s mould to deal with
- The product the joint needs
- The old material and how stubborn it is
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- What’s wrong with the joints now
- The type of property
- How many joints, rooms or windows are involved
- If someone has resealed it before
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you’re ready, ring 0345 464 0079 or email us.
Questions from Old Knebworth
Will you come out to Old Knebworth?
Yes, Old Knebworth is covered. 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.
Can you help a landlord with a rental near Knebworth station?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Do you seal glass balustrade bases?
Yes, where the base is finished with sealant. Send us photos and we’ll take a look when you call 0345 464 0079 or send us an email.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Is it enough to run a bead over the old sealant?
It doesn’t last. Fresh silicone will not bond to cured silicone, so we remove the old sealant and clean the joint.
Can you replace a misted double-glazed unit?
No. Misting between panes means the sealed unit has failed, and a glazier needs to replace it.
Can you quote for more than one area?
Yes, and it often makes sense. Doing several areas at once is generally more efficient, so mention them when you ask for a quote.
How it works
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes anything from an hour or two to most of a day, depending on the size of the job. In a small place like Old Knebworth, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we agree the joints to be done.
- Old sealant is removed from the glass and frame.
- The surfaces are cleaned with a suitable solvent.
- We apply and tool the new silicone.
- The joints are checked before we leave.
Before we arrive
- Keep pets and children clear of the area while we work
- Let us know about parking restrictions
- For business premises, tell us about site rules or sign-in
Getting a quote
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.