Greater London · England
Sand mastic for sash & case windows in Staples Corner, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Staples Corner, backed by a 12-month guarantee. Ask us for a quote.
- Mastic dropping out of the joint
- Wind and rain getting in round a sash window
- Cracked mastic round a front door frame
How we handle sand mastic in Staples Corner
Silicone on a period window often looks wrong and isn’t always the right material. Sand mastic is the traditional choice and we can swap the silicone for it. If you have open joints round the window box and crumbling sand mastic round a window, we can help.
Many London homes are flats, with windows high above the street. 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 Staples Corner is something to talk through when you book.
Big or small, it’s backed by our 12-month guarantee.
- Where
- Staples Corner (NW2, NW4, NW9)
- Region
- Greater London
- Cover
- One year on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can be quoted together.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
DIY versus a professional finish
If you are 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 doesn’t work out, we can still put it right.
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.
How to look after the new joints
After the cure time, these simple habits help:
- Don’t run silicone over sand mastic
- Sort the mastic before the decorators arrive
- Get any rot dealt with first
- Avoid heavy scraping on the mastic joint
Leave the new mastic unpainted, as traditional guidance advises. Ask us before any decorating around it.
Sound mastic protects the frame. Failed mastic lets water reach the timber and timber that stays wet can rot.
Places near Staples Corner
Also in Staples Corner
When to call us in Staples Corner
Timber swells and shrinks with the weather. That movement opens up the mastic joint over time.
Most people get in touch after spotting one of these:
- Crumbling sand mastic round a window
- Weathered mastic on the most exposed windows
- A silicone bead on a sash window that spoils the look
- Draughty sash windows at the surround
For site and facilities teams at buildings such as Parkfield Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- Whether they’re fully insured
- Whether the sealant suits the joint
- Whether they seal over old material or remove it
- How hidden problems are handled
Staples Corner questions
Do you cover Staples Corner for sand mastic?
Yes. We work across London and the South East, and Staples Corner is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
I let a flat near Brent Cross West station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
Can you quote for more than one area?
Yes, we can. More than one area can be quoted together.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Should I use sand mastic or silicone?
It depends on the window. On many period windows, sand mastic looks right and suits the building, while modern frames normally get a flexible sealant.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Do you work for hotels and businesses?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Why it’s worth doing now in Staples Corner
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic suits the building and blends with the stone or brick. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Staples Corner, the repair is bigger than a sealant job.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, phone 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
Why book with us
- Fully insured
- Experience in homes, commercial sites and hotels
- 20+ years of sealant experience
- Old sealant always removed completely
Take a look at what affects the cost or our reviews.
Sand mastic in Staples Corner: local notes
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For an older house near a landmark such as Church of St John, the joint between an old wall and a newer frame is usually the first place rain gets in. Staples Corner is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Staples Corner is about 1 mile south of Hendon, in Greater London. We carry out sand mastic for homeowners, landlords and businesses in Staples Corner and nearby, as part of our work across Greater London. 764 places in Greater London are on our list, from the larger towns to small villages. There’s also a page for London, roughly 8 miles from Staples Corner.
Work in NW2, NW4 and NW9 is quoted and booked the same way as anywhere else. You will find streets such as Park Road, Humber Road and Oxgate Lane. Close by, we work in Brent Cross (1 mile north-east), Dollis Hill (1 mile south-west), Hendon (1 mile north), The Hyde (1 mile north-west) and West Hendon (1 mile north-west). Further out, we also cover London (8 miles south-east), City of Westminster (5 miles south-east), Marylebone (5 miles south-east), Kensington (5 miles south), St Pancras (6 miles south-east) and Shoreditch (7 miles south-east).
Landmarks near Staples Corner
Around Staples Corner, our work takes us to homes and buildings near Clarefield Park, Clarion and Woodfield School, among other places. There’s a railway station in Staples Corner itself: Brent Cross West station. A little further out are St Andrew's Hospital (0.7 miles south) and Church Farmhouse Museum (1.3 miles north). Green spaces nearby include Westbere Copse and Darland's Lake.
What affects the cost of sand mastic
The price is agreed before any work begins. It takes into account:
- The product the joint needs
- Whether there’s mould to deal with
- Access and height
- When we can work, for business premises
Doing several joints on one visit generally makes better use of the time than several visits. You’ll get one clear quote for the whole job.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- Access, such as stairs, a lift or height
- The rough size of the job
- Where the job is, and your postcode
- Any previous sealing or DIY work
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved before giving you a price.
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours for a single window, longer for several, depending on how much there is to do. For a job in Staples Corner, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by checking each surround and agreeing the joints to renew.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
Before we arrive
- Mention any tricky access
- Move anything stored near the joints
- Keep children and pets away from the work area
How to get a quote
Getting a quote is simple: let us know the job and the location. A few pictures by email make the job easier to understand.