Greater London · England
Window Mastic in Sudbury Hill
Mastic around window and door frames, sills and patio doors in Sudbury Hill, with a one-year guarantee on every job. Call for a quick quote.
- Water coming in at the bottom corners of a door
- Untidy mastic left by window fitters
- Leaking joints at the ends of sills
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a morning for a couple of windows and a door and we leave things clean and tidy. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Sudbury Hill. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Mention any parking rules near the property
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
Getting a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved.
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How we handle window mastic in Sudbury Hill
There are two joints on most windows. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. If you are dealing with draughts coming in around windows and doors and damp patches on the reveal after heavy rain, we can put it right, on composite doors, uPVC windows and aluminium frames alike.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Sudbury Hill is something to talk through when you book.
All our work is covered by a one-year guarantee.
- Place
- Sudbury Hill (HA0, UB6, HA1)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Places near Sudbury Hill
Other services in Sudbury Hill
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- A failed sealed unit that has misted up
- Rotten timber, which needs a joiner first
- A sash or casement that won’t close properly
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Timber windows & doors
- Patio & French doors
- Aluminium frames
- uPVC windows
- Composite doors
- Window sills
Different surfaces, different methods
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 we pay close attention there.
Window sills
Stone and concrete sills have their own joints, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.
Should I try it myself first?
If you’re 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.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
Landlord and commercial work in Sudbury Hill
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.
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Window mastic in Sudbury Hill: local notes
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
As a London address, Sudbury Hill can be tricky for parking: let us know about parking bays, permits or a driveway. For site and facilities teams at buildings such as Sudbury Primary School, larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Sudbury & Harrow Road station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Sudbury Hill is about 1 mile south-west of Wembley, in Greater London. Sudbury Hill gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Sudbury Hill is one of 764 places in Greater London we cover. There’s also a page for London, roughly 10 miles from Sudbury Hill.
Every address in HA0, UB6 and HA1 is within our area for window mastic, from the main roads to the quietest streets. That includes homes and businesses on Elms Lane, Harrow Road and Perrin Road and the roads around them. You’ll find Sudbury Hill on the A4005, so it’s easy for us to get to. Close by, we work in Sudbury (1 mile west), North Wembley (1 mile east), Brondesbury Park (1 mile east), Harrow on the Hill (1 mile north-west) and Perivale (1 mile south). Further out, we also cover London (10 miles east), City of Westminster (8 miles east), Marylebone (8 miles east), Kensington (6 miles south-east), St Pancras (9 miles east) and Shoreditch (11 miles east).
Local landmarks in Sudbury Hill
Typical jobs here are in homes near Orley Farm School, Wembley High Technology College and Preston Park, among other places. There’s a railway station in Sudbury Hill itself: Sudbury & Harrow Road station. Other landmarks nearby include Kodak Museum (2.9 miles north) and London Designer Outlet (1.5 miles east). For a walk, there’s Castlebar Hill and Perivale Wood.
Sudbury Hill: your questions answered
Do you work for landlords with property near Sudbury & Harrow Road station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
Can you do window mastic in Sudbury Hill?
Yes. We work across London and the South East, and Sudbury Hill is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing.
Will new mastic stop draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
Do you seal inside as well as outside?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Are you fully insured?
Yes. Full insurance covers our work.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we are fully insured.
Is it OK to seal over old sealant?
No. Fresh sealant does not stick to old sealant, and it traps any mould or water underneath. It all has to come out first.
Can you do several jobs on one visit?
Yes. More than one area can go on one quote.
Why act early in Sudbury Hill
Running fresh sealant over the old joint is tempting, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. Proper resealing starts with removing the old joint. 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 Sudbury Hill, the repair is bigger than the sealant job would have been.
A few things move the cost up or down: 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.
Why Sudbury Hill customers choose us
- A choice of colours where the product allows
- Quality sealants from Arbo and Everbuild
- We are fully insured
- Anti-fungal sanitary silicone in wet areas
Read our cost guide or our reviews.
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Avoid harsh chemicals near the mastic
- Check the mastic once a year
- Clear any debris from frame drain holes
- Keep paint off silicone joints
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.