Greater London · England
Window Mastic in Broadfields Estate
Window mastic across Broadfields Estate and nearby, with old sealant always removed completely and a 12-month guarantee.
- A bead that doesn’t match the frame
- Rushed sealant from a window installation
- Old mastic that has gone black or come away
Broadfields Estate questions
Is Broadfields Estate in your area for window mastic?
Yes. We work across London and the South East, and Broadfields Estate is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll send you a clear quote.
Can parking be tricky for a visit in Broadfields Estate?
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.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
I’m a tenant. Can you help?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can you get sealant to suit coloured frames?
Normally, yes. Tell us the frame colour when you get in touch and we will use the nearest match.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Window mastic for homes and businesses in Broadfields Estate
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on patio & French doors, composite doors and timber windows & doors, and common reasons people get in touch are hard, cracked sealant around windows and sealant in the wrong colour for the frame.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Broadfields Estate is something to talk through when you book.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Broadfields Estate (HA8, NW7)
- Wider area
- Greater London
- Cover
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
Running fresh sealant over the old joint is tempting, but new sealant can’t bond to old, crumbling mastic. It peels before long, and water still gets in behind. The old mastic has to come out. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Broadfields Estate, the repair is bigger than the sealant job would have been.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
What you get with us
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal silicone where joints get wet
- A sealant colour to suit the surroundings
- Any old sealant cut out fully, not covered over
Take a look at our cost guide or what customers say.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Damp coming through the wall itself rather than the frame joint
- Broken hinges, locks or handles
- A frame that has rotted at the joint
If you are not sure, just phone 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Window sills
- Composite doors
- Patio & French doors
Broadfields Estate homes and the weather
With historic houses such as Headstone Manor (about 4.1 miles south-west) nearby, there’s older building stock in the area around Broadfields Estate as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
If you let a flat or house near Mill Hill Broadway station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Broadfields Estate is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Broadfields Estate is about 1 mile north of Edgware, in Greater London. Across the HA8 area, we cover window mastic for homes and businesses. Our Greater London coverage runs to 764 places, Broadfields Estate among them. We also work in London, about 12 miles from Broadfields Estate.
Jobs for window mastic in HA8 and NW7 is quoted and booked the same way as anywhere else. You will find streets such as Clay Lane, Mowbray Road and Cranmer Road, all of which we cover. Nearby, we also carry out window mastic in Edgware (1 mile south), Edgware Bury (1 mile north-west), The Hale (1 mile south-east), Deacon's Hill (1 mile north) and Burnt Oak (1 mile south-east). We also work in nearby towns such as London (12 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles south-east), Kensington (9 miles south), St Pancras (10 miles south-east) and Shoreditch (11 miles south-east).
Local landmarks in Broadfields Estate
We work in homes and buildings around Edgwarebury Park, The Northgate School and London Academy. The nearest railway station is Mill Hill Broadway station, roughly 1.4 miles south-east. Nearby you will also find Royal National Orthopaedic Hospital (1.4 miles west) and Elstree and Borehamwood Museum (2 miles north). Green spaces nearby include Darland's Lake and Edgware Way Grassland.
Also near Broadfields Estate
Also in Broadfields Estate
Signs you need window mastic in Broadfields Estate
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Signs it’s time to call us include:
- Black, perished sealant on frames
- Untidy mastic left by window fitters
- Sealant in the wrong colour for the frame
- Water coming in at the bottom corners of a door
For site and facilities teams at buildings such as Rosh Pinah Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before booking
- How long the guarantee is
- What the quote includes, VAT included or not
- Whether all the old sealant comes out first
- Whether you can choose the colour
Surface by surface
Patio & French doors
Water at the foot of a door frame is not always the mastic: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We look for the cause first.
Window sills
Masonry sills can have joints where water gets in, including the one between the sill and the frame above. We seal those with a sealant suited to masonry.
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Do not aim a pressure washer at the joints
- Don’t use solvent cleaners on the joint
- Paint up to the joint, not over it
- Make sure the drainage slots aren’t blocked
A yearly look round the frames is enough. Small splits are simple to catch before they leak, and if anything looks wrong, just ring 0345 464 0079 or email us.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
What affects the quote in Broadfields Estate
Your quote is based on your job. We take into account:
- The old material and how stubborn it is
- How many areas need sealing
- Which sealant suits the joint
- When we can work, for business premises
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts.
What to tell us for a quote
You don’t need to know the technical terms. It helps if you can tell us:
- If it’s domestic, commercial or a hotel
- How many joints, rooms or windows are involved
- How we’d reach the joints
- The problem you’ve noticed
Getting a quote is simple: tell us what needs doing and where. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
What happens on the day
We bring everything the job needs with us, so you don’t need to buy or prepare anything. Once we have agreed what’s being done, we protect the area and start. Most jobs take a few hours for a handful of frames, longer for a whole house. 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.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
- Move anything stored near the joints
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or email us.