Greater London · England
Window Mastic in Upper Norwood
Professional window mastic in and around Upper Norwood, with every bit of old sealant taken out first and a 12-month guarantee.
- Mastic that’s falling out in pieces
- Hard, cracked sealant around windows
- Cracked sealant at the sill ends
Windows and doors in Upper Norwood
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Christ Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Letting a property close to Gipsy Hill station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Upper Norwood is about 4 miles south-east of Stockwell, in Greater London. Upper Norwood gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Greater London coverage runs to 764 places, and Upper Norwood is one of them. London is on our list too, about 6 miles from Upper Norwood.
Here we cover the SE19, SE27 and SE21 postcode area for window mastic. You will find streets such as Dover Road, Hawke Road and Tudor Road. Being close to the A214, Upper Norwood is simple for us to get to for window mastic. If you are just outside Upper Norwood, we cover Norwood New Town (1 mile west), Gipsy Hill (1 mile north-east), West Norwood (1 mile north-west), Crystal Palace (1 mile east) and Anerley (1 mile east). Larger places within reach include London (6 miles north), City of Westminster (7 miles north-west), Marylebone (7 miles north), Kensington (7 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Around Upper Norwood
In Upper Norwood, that means homes and buildings near The Sparrowhawk pub, Long Meadow and Rockmount Primary School. Upper Norwood has its own railway station: Gipsy Hill station. A little further out are St Christopher's Hospice (1.3 miles east) and Crystal Palace Museum (0.5 miles east). Not far away are Dulwich Upper Wood and Knight's Hill.
Window mastic for homes and businesses in Upper Norwood
If you can feel air around a shut window, the gap is often at the frame. A new joint stops the air getting through. If the draught is through the window seals instead, we will tell you. We work on uPVC windows, patio & French doors and composite doors, and the jobs we see most are draughty joints inside around the window and mastic that has split away from the wall.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
Every job comes with a 12-month guarantee, wherever you are in Greater London.
- Where
- Upper Norwood (SE19, SE27, SE21)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. It normally takes anything from an hour or two to a full day, depending on how many frames there are. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
Before we arrive
- Let us know about stairs, lifts or work at height
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
Get a quote
To get a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Advice
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
Towns and villages near Upper Norwood
What else we do in Upper Norwood
FAQs for Upper Norwood
Can parking be tricky for a visit in Upper Norwood?
Parking in Upper Norwood, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Is Upper Norwood in your area for window mastic?
Yes. Our work covers London and the South East, and Upper Norwood is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
When is the sealant fully cured?
It depends on the product and the conditions. We tell you how long to leave it before we go.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Can you reach windows above the ground floor?
Yes, if safe access is possible. For high or awkward windows, we will tell you what access is needed.
How many windows can you do in a day?
A few frames take a few hours, while a whole house takes longer. We confirm the timing with your quote.
What affects the quote in Upper Norwood
We do not publish a price list. The quote depends on:
- Whether the work is at height
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- Any working-time requirements on site
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and give you a clear quote before we start.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- If it’s domestic, commercial or a hotel
- Where the property is
- Pictures of the joints, sent by email
- What’s wrong with the joints now
Need a quote? Please ring 0345 464 0079 or email us with a few details. We will explain what we’d do and send you a clear quote before work begins.
Do you need window mastic in Upper Norwood?
Joint shape matters as much as the product. A skim of sealant over a wide gap soon tears, and a gap filled solid can’t flex. That’s what backing rod is for.
If you can see any of these, it’s time to have the joints looked at:
- Cracked or shrunken mastic around the frame
- Whistling draughts around closed windows
- Black, perished sealant on frames
- Leaking joints at the ends of sills
Upper Norwood is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Before you book anyone
- When the joint can take water or movement
- What preparation is included
- Is VAT in the price?
- Whether the sealant suits the joint
What we cannot put right
Sealant isn’t the answer to every problem, and we’d rather say so up front. It won’t solve:
- A failed sealed unit that has misted up
- Penetrating damp from a failed cavity tray or render
- Faulty window hardware
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before booking.
Where we work in Upper Norwood
- Aluminium frames
- Composite doors
- Timber windows & doors
- Patio & French doors
- Window sills
- uPVC windows
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Keep drainage slots and sill grooves clear
- Keep paint off silicone joints
- Check the mastic once a year
- Do not aim a pressure washer at the joints
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Leaks usually show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Leave it or put it right?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
Combining jobs into one visit is generally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We will give you a clear price for the lot.
Why Upper Norwood clients choose us
- Sanitary silicone with an anti-fungal additive in wet areas
- Tidy, careful work
- Approved under the ARBOMaster scheme
- A choice of colours where the product allows
Take a look at our cost guide or our reviews.