Greater London · England
Duckett's Green Window Mastic
Window mastic for Duckett's Green and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Old mastic that has gone black or come away
- Cracked or shrunken mastic around the frame
- Rushed sealant from a window installation
Window mastic in Duckett's Green, done properly
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. We work on aluminium frames, uPVC windows and window sills, and the jobs we see most are cracked or shrunken mastic around the frame and cracked sealant at the sill ends.
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, letting in draughts and water.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Duckett's Green (N15, N22, N8)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Quotes for window mastic in Duckett's Green
There’s no set price list, because no two jobs are the same. The quote depends on:
- The size of the job
- The type of sealant required
- Any working-time requirements on site
- How many rooms, windows or areas are involved
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 will have a clear quote before any work starts.
Helping us quote
What to tell us when you ask for a quote:
- Whether it’s a home or a business
- Where the property is
- How we’d reach the joints
- If someone has resealed it before
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Look round the frames every year or so
- Do not aim a pressure washer at the joints
- Repaint timber before it’s bare
- Keep paint off silicone joints
Most silicone sealants won’t take paint, so mention any painting plans before we start. There are paintable sealants for joints that need it.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.
Duckett's Green homes and the weather
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. With historic houses such as Bruce Castle (about 1.2 miles north-east) nearby, there’s older building stock in the area around Duckett's Green as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near Christ Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Duckett's Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Duckett's Green is about 3 miles north of Highbury, in Greater London. Homes, rented property, offices and hotels in Duckett's Green can book us for window mastic, old or new, large or small. The work is guaranteed for a year. Across Greater London, we cover 764 places, and Duckett's Green is one of them. There’s also a page for London, about 6 miles away.
All of N15, N22 and N8 is within our area for window mastic, from the main roads to the quietest streets. Local streets include Bury Road, Mark Road and Frome Road, and we cover them all. You will find Duckett's Green on the A1080, so it’s easy for us to get to with everything needed for window mastic. Other places close to Duckett's Green include West Green (1 mile south-east), Harringay (1 mile south), St Ann's (1 mile south-east), Broadwater Farm (1 mile north-east) and Tottenham Green (1 mile east). We also work in nearby towns such as London (6 miles south), City of Westminster (6 miles south-west), Marylebone (5 miles south-west), Kensington (8 miles south-west), St Pancras (4 miles south) and Shoreditch (4 miles south).
Around Duckett's Green
Around Duckett's Green, our work takes us to homes and buildings near Moselle Upper School, Ducketts Common and The Queens Head pub and the streets around them. The nearest railway station is Hornsey station, about 0.7 miles west. Well-known places in the area include Greentrees Hospital (1.5 miles north) and Markfield Beam Engine and Museum (1.6 miles east). Open spaces near Duckett's Green include Hollow Pond and Railway Fields.
What sealant work can’t fix
We’ll always be straight with you, so here’s what sealant can’t fix:
- Broken hinges, locks or handles
- A failed sealed unit that has misted up
- Penetrating damp from a failed cavity tray or render
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think before you book.
Surfaces we seal
- Timber windows & doors
- Composite doors
- Window sills
- Aluminium frames
- uPVC windows
- Patio & French doors
Towns and villages near Duckett's Green
Other services in Duckett's Green
Common problems we fix in Duckett's Green
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, and it lets go sooner than it should.
Most people get in touch when they notice one of these:
- Water coming in at the bottom corners of a door
- A bead that doesn’t match the frame
- Gaps left after new windows were fitted
- Gaps between the frame and the inside reveal
If you look after a building such as St John Vianney RC Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- How long to leave it before use
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
- Whether VAT is included
What we do, step by step
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. Most jobs take most of a day for a typical house, less for a few frames. In a London area like Duckett's Green, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
How to prepare
- On commercial sites, let us know about site rules
- Tell us about any previous sealing or DIY attempts
- Move anything stored near the joints
Ask for a quote
Want a quote for window mastic? Please ring 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
How the job changes by surface
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so they get particular care.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
Duckett's Green: your questions answered
I let a flat near Hornsey station. Can you help?
Yes. We work for landlords and letting agents as well as householders, and several properties can go on one quote. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Is Duckett's Green in your area for window mastic?
Yes, Duckett's Green is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear quote.
Is the work guaranteed?
Yes. Our one-year guarantee covers every job.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
Can you seal the gap between the frame and the plaster indoors?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
Is it OK to seal over old sealant?
No, it won’t last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Do you take out the old sealant first?
Yes, always, and completely. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Can you get sealant to suit coloured frames?
Yes. We can use white, brown, anthracite grey, black or clear.
Should I try it myself first?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.