Greater London · England
North Harrow Glazing Silicone
Glazing silicone for conservatories, rooflights, glass panels and shower screens for homes and businesses in North Harrow and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Water escaping where a screen meets the wall
- Water getting into a conservatory at the joints
- Black or yellowed silicone on glass joints
About our glazing silicone in North Harrow
Not every silicone suits glass. Our applicators use neutral-cure glazing silicone, which suits glass and most frame materials, and we tool it to a neat, even finish. Typical jobs include leaks where conservatory glass meets the frame and stained, discoloured glazing silicone, across glass-to-frame joints, glass-to-glass joints and glass balustrade bases.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in North Harrow.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- North Harrow (HA2, HA1, HA5)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in North Harrow
The wrong sealant is a common cause. Some products do not bond well to glass, and acetoxy types can attack some frame materials.
These are the problems we’re asked about most:
- Leaks from the base of a shower screen
- Stained, discoloured glazing silicone
- Water tracking down the inner face of the glass
- Water getting into a conservatory at the joints
If you let a flat or house near Harrow-on-the-Hill station, glazing joints are worth checking at the end of a tenancy, before a small leak grows.
What your quote should include
- How hidden problems are handled
- When the joint can take water or movement
- What insurance they hold
- Whether you can choose the colour
Different surfaces, different methods
Rooflights
Water around a rooflight is not always the sealant. We find the cause first.
Glass-to-frame joints
The sealant must stick to glass and frame alike. We choose a product that suits both.
Also in North Harrow
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll give you a quote.
What happens on the day
Once we are on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. Most jobs then take a few hours for most jobs. In North Harrow, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at the glazing and agree which joints need resealing.
- Old sealant is removed from the glass and frame.
- The surfaces are cleaned with a suitable solvent.
- We apply and tool the new silicone.
- We inspect the work and test it where we can.
Before we arrive
- Let us know about parking restrictions
- Keep pets and children clear of the area while we work
- Mention any leaks or damp you’ve noticed
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or send us an email.
Related advice
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Aftercare tips
Aftercare is simple:
- Keep harsh solvents off the silicone
- Keep conservatory gutters clear of leaves
- Keep air moving in the conservatory
- Get a new leak looked at quickly
Do not use blades or scrapers near the bead when you clean. Stick to a soft cloth.
A small conservatory leak soon spreads. Water travels along the frame and into the wall, so get it looked at when you first see it.
Glazing silicone in North Harrow: local notes
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
As a London address, North Harrow can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Schools such as Longfield Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
North Harrow is about 1 mile north-west of Harrow, in Greater London. Whether you’re in the middle of North Harrow or further out, we cover glazing silicone for every kind of property, from flats and houses to offices and hotels. North Harrow is one of 764 places in Greater London where we work. London is on our list too, about 13 miles from North Harrow.
Here we cover the HA2, HA1 and HA5 postcode area for glazing silicone. That includes homes and businesses on The Avenue, Pinner Road and Durham Road and the roads around them. Neighbouring places we cover for glazing silicone include Rayners Lane (1 mile south-west), Harrow (1 mile south-east), Roxbourne (1 mile south-west), Eastcote (1 mile west) and Greenhill (1 mile east). Within a short drive, we also cover London (13 miles south-east), City of Westminster (10 miles south-east), Marylebone (10 miles south-east), Kensington (9 miles south-east), St Pancras (11 miles east) and Shoreditch (13 miles east).
Local landmarks in North Harrow
We work in homes and buildings around Nower Hill High School, Heathfield School and Headstone Manor Recreation Ground. For rail, the closest station is Harrow-on-the-Hill station, about 1.2 miles east. A little further out are St. George's Shopping Centre (1 mile east) and Hilfield Castle (5 miles north). Open spaces near North Harrow include Northala Fields and Islip Manor Meadows.
When it is not the sealant
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Frames that have decayed or split
- A sealed unit that has misted inside
- A sagging or failing conservatory roof
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly before booking.
Where we work in North Harrow
- Conservatory frames
- Shower screens
- Glass-to-glass joints
- Rooflights
- Glass-to-frame joints
- Glass balustrade bases
North Harrow questions
Is parking an issue for glazing silicone in North Harrow?
Parking in North Harrow, 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.
Do you cover North Harrow for glazing silicone?
Yes. We work across London and the South East, and North Harrow is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Do you reseal glass shower screens?
Yes, it’s a common job. We use anti-fungal silicone suited to bathrooms.
Can you match the sealant colour?
Generally, yes. White, clear and grey are common, and other colours are available for many products, and we will agree it with you first.
Do you work for landlords and businesses?
Yes, regularly. We can quote for several properties at once.
Do you remove the old sealant?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Is there any odour?
There can be a smell while the sealant cures, which fades as it sets. Opening a window helps.