Greater London · England
Hampstead Garden Suburb Window Mastic
Problem with your window and door frames in Hampstead Garden Suburb? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- White mastic on grey or black frames
- Damp patches on the reveal after heavy rain
- Mastic that has split away from the wall
Window mastic for homes and businesses in Hampstead Garden Suburb
Frames and walls do not move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. If you have mastic that’s falling out in pieces and mastic that has split away from the wall, we can help, on uPVC windows, window sills and patio & French doors alike.
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.
All of our work is guaranteed for twelve months.
- Place
- Hampstead Garden Suburb (NW11, N2, N3)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need window mastic in Hampstead Garden Suburb
Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
Common reasons people contact us are:
- Cracked sealant at the sill ends
- Mastic that’s falling out in pieces
- Whistling draughts around closed windows
- Gaps left after new windows were fitted
Heath Hall, about 0.8 miles south-east, is one of the historic houses in the wider area around Hampstead Garden Suburb, and older homes nearby need a sealant that suits their walls.
What to look for in a quote
- What preparation is included
- Whether the sealant suits the joint
- How the colour is chosen
- What the cure time is
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Surface by surface
Window sills
Where a sill meets brick or render, the ends often crack first. We reseal them so rain can’t run into the wall.
Composite doors
A composite door normally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
What window mastic looks like in Hampstead Garden Suburb
With historic houses such as Heath Hall (about 0.8 miles south-east) nearby, there’s older building stock in the area around Hampstead Garden Suburb 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’s traditional sand mastic. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Brent Cross West station? Then renewing tired window mastic between tenants heads off draught and damp complaints. If you look after a building such as The Henrietta Barnett School, its window and door frames need their mastic kept sound, just like a home’s.
Hampstead Garden Suburb is about 1 mile south-west of East Finchley, in Greater London. Whether you are in the middle of Hampstead Garden Suburb or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Hampstead Garden Suburb is one of 764 places in Greater London we cover. London is on our list too, around 7 miles away.
Our applicators cover all of the NW11, N2 and N3 postcode area for window mastic and the streets around it. We cover properties on Maya Road, Oakwood Road and Bigwood Road. Hampstead Garden Suburb sits on or near the A1, so getting to you is simple. We also cover Temple Fortune (1 mile west), East Finchley (1 mile north-east), Golders Green (1 mile south-west), North End (1 mile south) and Vale of Health (1 mile south). Within a short drive, we also cover London (7 miles south-east), City of Westminster (5 miles south), Marylebone (5 miles south), Kensington (6 miles south), St Pancras (5 miles south-east) and Shoreditch (6 miles south-east).
Around Hampstead Garden Suburb
Around Hampstead Garden Suburb, our work takes us to homes and buildings near The Old White Lion pub, Brookland Infant and Nursery School and Lyttelton Playing Fields and the streets around them. The nearest railway station is Brent Cross West station, roughly 2.1 miles south-west. Other landmarks nearby include Brent Cross Shopping Centre (1.7 miles west) and Jewish Museum - Finchley (0.9 miles north). Green spaces nearby include Darland's Lake and Parliament Hill.
Why deal with it now?
Working on frames from a ladder with a sealant gun is not easy, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, in a sealant suited to the wall. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Hampstead Garden Suburb, the repair is bigger than a sealant job.
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
Why book with us
- Rated 4.9 stars on Google
- You choose the colour before work begins
- Tidy, careful work
- Sealant colour chosen to suit
The process
A visit follows a simple pattern: we look at the joints together, protect the area around them, carry out the job and clear up. Most jobs take a morning for a couple of windows and a door. For a job in Hampstead Garden Suburb, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Keep children and pets away from the work area
- Let us know about stairs, lifts or work at height
- Let us know if you’ve seen damp or leaks
How to get a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before any work starts.
Advice
What affects the quote in Hampstead Garden Suburb
The price is agreed before any work begins. It’s based on:
- Mould in or behind the old joints
- How much old sealant there is and how hard it is to remove
- The type of sealant required
- How much there is to do
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
Helping us quote
What to tell us when you ask for a quote:
- The type of property
- If someone has resealed it before
- The address or postcode of the job
- What’s wrong with the joints now
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or email us.
Hampstead Garden Suburb questions
Is Hampstead Garden Suburb in your area for window mastic?
Yes. Our work covers London and the South East, and Hampstead Garden Suburb is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
Can parking be tricky for a visit in Hampstead Garden Suburb?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
How long should I leave it?
Cure times vary by product. We tell you how long to leave it before we go.
Will new mastic stop draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
Is it OK to seal over old sealant?
No, it will not last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
How long will my window job take?
Allow a few hours for a handful of frames, longer for a whole house. Access and the amount of old mastic make the biggest difference.
Can new window sealant be painted?
Silicone generally will not take paint. Let us know beforehand, and we’ll use a paintable product where it suits.
Also near Hampstead Garden Suburb
Also in Hampstead Garden Suburb
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Wipe condensation off the frames
- Keep drainage slots and sill grooves clear
- Clean frames with a soft cloth and soapy water
- Don’t aim a pressure washer at the joints
Silicone can’t generally be painted, so if you are planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.