Greater London · England
Sand mastic for sash & case windows in Edgware, Greater London
We cover Edgware for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Cracked mastic round a front door frame
- Patchy fillers round a sash window
- Mastic worn away on windows facing the weather
Landlords, agents and businesses in Edgware
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Letting agents and landlords in Edgware can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
Sand mastic in Edgware, done properly
Fresh sand mastic forms a skin quite soon, but it takes longer to harden fully. Traditionally, sand mastic is left unpainted, so ask us before you decorate. If you have mastic dropping out of the joint and draughty sash windows at the surround, we can put it right, on tenement windows, stone surrounds and period & listed homes alike.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Edgware.
Whatever the size of the job, it’s backed by our one-year guarantee in Edgware and across Greater London.
- Location
- Edgware (HA8, NW7, HA7)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
An open joint round the frame lets weather in. Water can get to the frame and the masonry so renewing it early protects the window. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Edgware, the repair is bigger than the sealant job would have been.
What it costs depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Edgware
- 180+ five-star Google reviews
- Old sealant always removed completely
- Quality sealants from Arbo and Everbuild
- We leave the area clean and tidy
Take a look at what affects the cost and our reviews.
What affects the quote in Edgware
We don’t publish a price list. The quote depends on:
- How many rooms, windows or areas are involved
- Which sealant suits the joint
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, call 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
What to tell us for a quote
To help us quote quickly, please include:
- Roughly how big the job is
- Pictures of the joints, sent by email
- If someone has resealed it before
- The address or postcode of the job
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details and send pictures if you have them.
Frames and glazing around Edgware
With historic houses such as Headstone Manor (about 3.9 miles south-west) nearby, there’s older building stock in the area around Edgware as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book.
As a London address, Edgware can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For site and facilities teams at buildings such as Beit Shvidler Primary School, 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. Across the HA8 area, we can carry out sand mastic at your property. We cover 764 towns and villages across Greater London, large and small. London is on our list too, about 11 miles from Edgware.
Work in HA8, NW7 and HA7 works the same way as everywhere else we cover. We cover properties on Station Road, Edgware Road High Street and Hillcrest Avenue and the roads around them. Main roads around Edgware include the A5100, so getting to you is simple. Nearby, we also carry out sand mastic in 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). Within a short drive, we also cover 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).
Landmarks near Edgware
Locally, jobs take us to homes and businesses close to The Northgate School, Railway Hotel and London Academy, among other places. For rail, the closest 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). For a walk, there’s Darland's Lake and Mill Hill Old Railway Nature Reserve.
More services for Edgware
Edgware: your questions answered
Do you cover Edgware for sand mastic?
Yes, Edgware is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing, and we’ll send you a clear quote.
Can you help a landlord with a rental near Mill Hill Broadway station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
How do I get a quote for sand mastic in Edgware?
Size, access and the old material all affect the cost. Call for a quick quote.
Is the work guaranteed?
You get our 12-month guarantee on every job.
Do you have insurance?
Yes, we are fully insured.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before resealing.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Edgware and the rest of Greater London, along with the rest of our area.
Aftercare tips
So the new joints stay in good condition:
- Leave the new mastic unpainted
- Keep modern sealant off the mastic
- Find out about consent before window work on a listed home
- Plan mastic work ahead of painting
Leave the new mastic unpainted, as traditional guidance advises. Ask us before any decorating around it.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
What we are called out for in Edgware
Most of it is simply age. Sand mastic is a maintenance item like any pointing, depending on exposure and upkeep.
People generally contact us after spotting one of these:
- Mastic worn away on windows facing the weather
- Crumbling sand mastic round a window
- Cracked mastic round a front door frame
- A silicone bead on a sash window that spoils the look
Homes close to St Andrew include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- Which sealant they’ll use, and why
- How long the guarantee is
- What happens if they find a problem under the old sealant
- Are they insured?
Should I try it myself first?
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 are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
How it works
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself generally takes a few hours for a single window, longer for several, depending on the size of the job. In Edgware, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Move anything stored near the joints
- Let us know about parking restrictions
- Let us know about earlier repairs to the joints
Get a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.