Greater London · England
Window Mastic in Edgware
Mastic around window and door frames, sills and patio doors for homes and businesses in Edgware and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked or shrunken mastic around the frame
- Water coming in at the bottom corners of a door
- Cracked internal joints between frame and plaster
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Air rooms to keep condensation down around windows
- Paint up to the joint, not over it
- Check the mastic once a year
- Clean frames with a soft cloth and soapy water
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
Window mastic for homes and businesses in Edgware
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that can’t flex, so we fit backing rod to set the right depth. That way the new bead bonds to the frame and the wall only. If you have hard, cracked sealant around windows and old mastic that has gone black or come away, we can help, whatever the surface.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Edgware as anywhere.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Place
- Edgware (HA8, NW7, HA7)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Honest limits
A few problems are outside what sealant work can do:
- Penetrating damp from a failed cavity tray or render
- A door that needs adjusting, rehanging or new seals
- Broken hinges, locks or handles
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
What we seal
- Window sills
- Composite doors
- Aluminium frames
- Timber windows & doors
- Patio & French doors
- uPVC windows
Quotes for window mastic in Edgware
Call for a quick quote. The main things that affect it are:
- The old material and how stubborn it is
- Whether there’s mould to deal with
- How easy the joints are to reach
- The size of the job
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- The rough size of the job
- Photos by email, if that’s easy
- Where the job is, and your postcode
- How we’d reach the joints
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
DIY sealant or a professional job?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so just mention it when you contact us.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Edgware questions
Do you work for landlords with property near Mill Hill Broadway station?
Yes. We work for landlords and letting agents as well as homeowners. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Can parking be tricky for a visit in Edgware?
Parking in Edgware, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Will you leave a mess?
Tidy work is part of the job. We protect what’s around the joints.
How long will my window job take?
That depends on the number of frames, how they’re reached and the state of the old mastic. You’ll know the timing when we quote.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Can you do the inside joint as well?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We can do either or both.
What should I tell you?
A short description and the location, with photos by email if possible. We will ask anything else we need to know.
Can new window sealant be painted?
Most silicone cannot be painted. Let us know beforehand, and we’ll use a paintable product where it suits.
How the visit works
We keep the work tidy and contained to the joints we’re treating. The job normally takes anything from an hour or two to a full day, depending on how many frames there are, and we tell you how long to leave it before we go. For a job in Edgware, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
How to prepare
- Tell us about any water getting in
- Try not to wet indoor joints just before the visit
- Mention if the joints have been sealed before
How to get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work.
Read more
Landlords, agents and businesses in Edgware
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
Why act early in Edgware
Draughts and leaks do not always mean new windows. If the frames and glass are in good order, resealing the joints is often all that is needed. Problems with the glass or gaskets are for a window company, and we’ll say so. In a flat in Edgware, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
What you get with us
- Anti-fungal silicone where joints get wet
- Fully insured
- Neat joints and a tidy finish
- 4.9 on Google from 180+ five-star reviews
Take a look at our cost guide and what customers say.
Places near Edgware
Also in Edgware
Window mastic in Edgware: local notes
Historic houses like Headstone Manor (about 3.9 miles south-west) are a reminder that the area around Edgware has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
For landlords with property near Mill Hill Broadway station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Edgware is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Managing a site like Beit Shvidler Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Edgware is about 4 miles west of Finchley, in Greater London. If you need window mastic in Edgware, it’s easy to get a quote: please ring 0345 464 0079 or drop us an email. We’re based in Crawley and cover Greater London, Edgware included. Our Greater London coverage runs to 764 places, and Edgware is one of them. We also work in London, around 11 miles away.
Work in HA8, NW7 and HA7 is quoted and booked the same way as anywhere else. You will find streets such as Station Road, Edgware Road High Street and Hillcrest Avenue. Being close to the A5100, Edgware is easy for our applicators to reach. Other places close to Edgware include The Hale (1 mile east), Broadfields Estate (1 mile north), Burnt Oak (1 mile south-east), Canons Park (1 mile south-west) and Little Stanmore (1 mile south-west). We also work in nearby towns such as London (11 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles south-east), Kensington (9 miles south), St Pancras (9 miles south-east) and Shoreditch (10 miles south-east).
What’s near Edgware
Around Edgware, our work takes us to homes and buildings near The Northgate School, Railway Hotel and London Academy and the streets around them. The nearest railway station is Mill Hill Broadway station, about 1.1 miles south-east. Other landmarks nearby include Hilfield Castle (3.6 miles north-west) and Broadwalk Centre (0.5 miles south-west). Open spaces near Edgware include Darland's Lake and Mill Hill Old Railway Nature Reserve.