Greater London · England
Window & door mastic in Osidge, Greater London
Window mastic across Osidge and nearby, with old sealant always removed completely and a one-year guarantee.
- Draughts coming in around windows and doors
- White mastic on grey or black frames
- Gaps left after new windows were fitted
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Wipe condensation off the frames
- Do not aim a pressure washer at the joints
- Clear any debris from frame drain holes
- Look round the frames every year or so
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Early resealing stops it reaching that point.
About our window mastic in Osidge
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. We work on composite doors, timber windows & doors and window sills, and common reasons people get in touch are water coming in at the bottom corners of a door and hard, cracked sealant around windows.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
A 12-month guarantee comes as standard, so you’re covered after we’ve gone.
- Where
- Osidge (N14, EN4, N11)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Osidge
More services for Osidge
When to call us in Osidge
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, and a gap filled solid cannot flex. Backing rod sets the right depth.
It’s worth asking for a quote if you see:
- Mastic that’s falling out in pieces
- Rain getting in at the frame or under the sill
- Gaps where the sill meets the wall
- Hard, cracked sealant around windows
If you let a flat or house near Oakleigh Park station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
What your quote should include
- How long the guarantee is
- How the surfaces are prepared before sealing
- Whether the sealant suits the joint
- Who turns up on the day
Questions from Osidge
Can you help a landlord with a rental near Oakleigh Park station?
Yes. We work for letting agents and landlords as well as homeowners. You can call 0345 464 0079 or email us with the details for a clear quote.
Is parking a problem for a job in Osidge?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
How long will my window job take?
The work takes a few hours for a few frames, or a day or more for a whole house. Access and how stubborn the old mastic is affect the time most.
Can I paint over the new sealant?
Not generally, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Can you do upstairs windows?
Yes, where they can be reached safely. Let us know about access when you ask for a quote so we can plan the job.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures.
What the job involves on each surface
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall and tooled smooth.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours for a handful of frames, longer for a whole house, including the tidy-up. For a job in Osidge, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Keep pets and children clear of the area while we work
- For business premises, tell us about site rules or sign-in
Getting a quote
Want a quote for window mastic? Please call 0345 464 0079 or drop us an email 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
Why deal with it now?
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished. In a flat in Osidge, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll explain what it covers.
Why choose Mr Mastic in Osidge
- 4.9 on Google from 180+ five-star reviews
- Colour agreed with you before work begins
- Tidy, careful work
- Any old sealant cut out fully, not covered over
Take a look at our cost guide or customer reviews.
Landlord and commercial work in Osidge
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
We work for landlords and agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
What affects the quote in Osidge
We quote each job individually. These are the things that affect it:
- When we can work, for business premises
- Whether there’s mould to deal with
- The number and length of the joints
- How many areas need sealing
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- The address or postcode of the job
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- Any previous sealing or DIY work
For a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
Windows and doors in Osidge
With historic houses such as Bruce Castle (about 3.8 miles south-east) nearby, there’s older building stock in the area around Osidge as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Monkfrith Primary School, the mastic around its windows and doors needs looking after like any other building’s. As a London address, Osidge can be tricky for parking: let us know about parking bays, permits or a driveway.
Osidge is about 2 miles south-east of Barnet, in Greater London. Anywhere in N14, we cover window mastic for homes and businesses. Across Greater London, we cover 764 places, Osidge among them. Our London page covers work nearby.
Postcode districts we cover here for window mastic: N14, EN4 and N11. Streets in the area include Dene Road, Farm Lane and Byre Road. You’ll find Osidge on the A111, so it’s easy for us to get to with everything needed for window mastic. Neighbouring places we cover for window mastic include Southgate (1 mile south-east), East Barnet (1 mile west), Brunswick Park (1 mile south-west), Oakwood (1 mile north-east) and Whetstone (1 mile south-west). We also work in nearby towns such as London (10 miles south), City of Westminster (8 miles south), Marylebone (8 miles south), Kensington (10 miles south), St Pancras (8 miles south) and Shoreditch (8 miles south).
Local landmarks in Osidge
Locally, jobs take us to homes and businesses close to Oak Hill Park, The Osidge Arms and Salcombe School. The closest station to Osidge is Oakleigh Park station, about 1 mile west of the centre. A little further out are Broomfield House Museum (1.6 miles south-east) and Grand Arcade (2.1 miles south-west). For a walk, there’s Darland's Lake and Barfield Allotments Nature Park.