Greater London · England
Sand mastic for sash & case windows in Broadfields Estate, Greater London
Specialist sand mastic for Broadfields Estate: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Gaps round a timber door in stone or brick
- Mastic that needs renewing before redecorating
- Wind and rain getting in round a sash window
Sand mastic in Broadfields Estate, done properly
Sand mastic does not last for ever, leaving gaps round the window. We rake it out and renew it and tidies the surround. We work on stone surrounds, period & listed homes and tenement windows, and the jobs we see most are cracked mastic round a front door frame and open joints round the window box.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Broadfields Estate.
Our work is backed for twelve months.
- Where
- Broadfields Estate (HA8, NW7)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. We rake it out and renew it.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Can I do it myself?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so just mention it when you contact us.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Landlords, agents and businesses in Broadfields Estate
We also work for property managers and facilities teams in Broadfields Estate and across Greater London. We can quote a run of properties together, and we are fully insured for the work.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Why act early in Broadfields Estate
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. Converted houses in London often have a bathroom above someone else’s living room, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or email us and we’ll talk you through it.
What you get with us
- We leave the area clean and tidy
- Quality sealants from Arbo and Everbuild
- Full insurance on every job
- 180+ five-star Google reviews
What affects the cost of sand mastic
The quote reflects the job in front of us. We look at:
- Any working-time requirements on site
- Access and height
- The number of rooms or windows
- Any mould that needs treating
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
What to tell us for a quote
When you call or email, it’s useful to know:
- The type of property
- The address or postcode of the job
- Whether it has been sealed before
- What’s wrong with the joints now
There’s no standard price list. Instead, we give you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Nearby places to Broadfields Estate
Other services in Broadfields Estate
The process
Good joint work is mostly preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours per window, depending on the condition of the joints. 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 surround is checked first.
- The joint is raked out and cleaned.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Getting ready for the visit
- Clear the area around the work
- Mention any leaks or damp you’ve noticed
- Let us know about earlier repairs to the joints
Ask for a quote
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll give you a clear price before any work starts.
Read more
When something else is needed
In fairness, there are a few things sealant won’t fix:
- Broken panes
- Crumbling stone or brickwork round the window
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly before booking.
Where we work in Broadfields Estate
- Sash and case windows
- Stone surrounds
- Timber door frames
- Period & listed homes
- Tenement windows
- Brick reveals
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. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking.
Rented homes near Mill Hill Broadway station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out. Homes close to St Andrew include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Schools such as Rosh Pinah Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Broadfields Estate is about 1 mile north of Edgware, in Greater London. Across the HA8 area, we cover sand mastic for homes and businesses. Our area takes in 764 places across Greater London, large and small. There’s also a page for London, roughly 12 miles from Broadfields Estate.
All of HA8 and NW7 is covered for sand mastic. We cover properties on Clay Lane, Mowbray Road and Cranmer Road and the roads around them. Close by, we work 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). Further out, we also cover 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
Around Broadfields Estate, our work takes us to homes and buildings near Edgwarebury Park, The Northgate School and London Academy. Broadfields Estate’s nearest station is Mill Hill Broadway station, roughly 1.4 miles south-east. Other landmarks nearby include Royal National Orthopaedic Hospital (1.4 miles west) and Elstree and Borehamwood Museum (2 miles north). Not far away are Darland's Lake and Edgware Way Grassland.
Broadfields Estate questions
Do you work for landlords with property near Mill Hill Broadway station?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Do you cover Broadfields Estate for sand mastic?
Yes, Broadfields Estate is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Is it possible to paint over sand mastic?
Traditional guidance is not to paint over sand mastic. If you’re redecorating the window, ask us first and we’ll advise.
How long will you be here?
A typical job takes a few hours per window, depending on the condition of the joints, including the preparation. We will confirm how long when we quote.
Can old silicone round a sash window be swapped for sand mastic?
Yes. We remove the silicone and clean the joint, then point it with sand mastic.
How do I get a quote for sand mastic in Broadfields Estate?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
How long does sand mastic take to harden?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
What information do you need?
Only a few details: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or send us an email.