Greater London · England
Sand Mastic in North Wembley
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for North Wembley, backed by a one-year guarantee. Call for a quick quote.
- Draughty sash windows at the surround
- Weathered mastic on the most exposed windows
- Old cement repairs round a window that have failed
Keeping the joints in good condition
Aftercare is simple:
- Sort the mastic before the decorators arrive
- Leave the new mastic unpainted
- Check the mastic when you check the paintwork
- Go gently near the mastic when preparing windows
Do not touch or press the mastic while it hardens. It skins over quickly, but takes longer to harden fully.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
About our sand mastic in North Wembley
We renew sand mastic around sash windows and doors set in stone or brick. Out comes the old, loose mastic, and new mastic is applied and shaped by hand. We work on period & listed homes, brick reveals and stone surrounds, and the jobs we see most are weathered mastic on the most exposed windows and modern sealant on a period surround.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking, and access in North Wembley is something to talk through when you book.
Big or small, it’s backed by our one-year guarantee.
- Location
- North Wembley (HA0, HA9, UB6)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near North Wembley
What else we do in North Wembley
What affects the quote in North Wembley
You will get a clear quote before we start. It’s based on:
- Access and height
- Whether there’s mould to deal with
- The type of sealant required
- How much old sealant there is and how hard it is to remove
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
What to tell us for a quote
What to tell us when you ask for a quote:
- The problem you’ve noticed
- The address or postcode of the job
- Pictures of the joints, sent by email
- Roughly how big the job is
There’s no standard price list, because every job is different. Instead, we give you a clear quote for your job. To arrange one, ring 0345 464 0079 or drop us an email.
FAQs for North Wembley
Is parking an issue for sand mastic in North Wembley?
Parking in North Wembley, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot.
Do you work for landlords with property near Wembley Central station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Do I need to be at home?
It depends on the job. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. We remove the silicone and clean the joint before the sand mastic goes in.
Should I use sand mastic or silicone?
It depends on the window. On many period windows, sand mastic looks right and suits the building and newer frames usually get a flexible sealant.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us.
Can I paint the new mastic?
Sand mastic is normally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
What happens on the day
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. Once we’ve agreed what’s being done, we protect the area and start. It normally takes anything from a few hours to a full day, depending on how many windows. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in North Wembley. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Getting ready for the visit
- Move anything stored near the joints
- Mention any parking rules near the property
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Advice
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
The biggest DIY mistake is sealing over old sealant. 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.
What we can’t put right
We’d rather tell you now than do work that will not last, so these are the limits:
- Putty and glazing repairs
- Damaged stone surrounds
- Decisions on consent for listed homes
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly before booking.
Joints and surfaces we work on
- Timber door frames
- Sash and case windows
- Tenement windows
- Stone surrounds
- Period & listed homes
- Brick reveals
Why it’s worth doing now in North Wembley
Not every filler suits an old window surround. Sand mastic matches what was there, which can matter on listed and conservation-area homes. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in North Wembley, the repair is bigger than a sealant job.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, ring 0345 464 0079 or email us for an honest opinion and a quote.
Why North Wembley clients choose us
- Domestic, commercial and hotel work
- Fully insured
- Over 20 years’ experience
- Old sealant always removed completely
See how sealant jobs are priced and our reviews.
North Wembley homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. With historic houses such as Northolt Manor (about 2.9 miles west) nearby, there’s older building stock in the area around North Wembley 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.
North Wembley is in London, so parking needs planning: let us know about parking bays, permits or a driveway. If you let a flat or house near Wembley Central station, any sash windows need sound mastic to keep draughts and rain out. Managing a site like Park Lane Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
North Wembley is about 2 miles south-east of Harrow, in Greater London. Across the HA0 area, our applicators can take on sand mastic. Our Greater London coverage runs to 764 places, and North Wembley is one of them. London is on our list too, around 10 miles away.
Here we cover the HA0, HA9 and UB6 postcode area for sand mastic. Streets in the area include Elm Road, East Lane and High Road, and we cover them all. Being close to the A4089, North Wembley is easy for our applicators to reach for sand mastic. Neighbouring places we cover for sand mastic include Brondesbury Park (1 mile north), Sudbury Hill (1 mile west), Sudbury (1 mile west), South Kenton (1 mile north) and Perivale (1 mile south-west). Within a short drive, we also cover London (10 miles south-east), City of Westminster (7 miles south-east), Marylebone (7 miles east), Kensington (6 miles south-east), St Pancras (8 miles east) and Shoreditch (10 miles east).
Near you in North Wembley
We work in homes and buildings around Wembley High Technology College, Preston Park and J.J. Moon's pub, among other places. There’s a railway station in North Wembley itself: Wembley Central station. Well-known places in the area include Clementine Churchill Hospital (1.4 miles north-west) and London Designer Outlet (0.8 miles east). Not far away are Perivale Wood and Castlebar Hill.
Landlords, agents and businesses in North Wembley
We also work for property managers and facilities teams in North Wembley and across Greater London. We can quote a run of properties together.
We work for landlords and agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.