Greater London · England
Sand Mastic in Mapesbury
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homeowners, landlords and businesses in Mapesbury. Fully insured, ARBOMaster approved and guaranteed for a year.
- Wind and rain getting in round a sash window
- Gaps between timber frames and stone or brick
- Silicone on a period window that looks wrong
Sand mastic in Mapesbury
Our applicators renew the sand mastic around sash and case windows and doors set in stone or brick. The old mastic is raked out, the joint is prepared and new mastic is shaped by hand. Common call-outs are for failed mastic on an exposed elevation and tired mastic found when preparing windows for paint, across brick reveals, period & listed homes and tenement windows.
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 Mapesbury.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Where
- Mapesbury (HA9, HA0, NW10)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
What happens on the day
We bring everything the job needs with us. Once we have 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. In Mapesbury, flats, stairs and shared entrances are part of the routine. 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.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Plan for the work area to be out of bounds to pets and children
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
To get a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. We will give you a clear quote before any work starts.
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Landlord and commercial work in Mapesbury
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.
What the job involves on each surface
Brick reveals
We rake out the old mastic and pack deep voids before pointing.
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we will confirm what’s needed.
FAQs for Mapesbury
Is Mapesbury in your area for sand mastic?
Yes, Mapesbury is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
I let a flat near Wembley Stadium station. Can you help?
Yes, we work for landlords and letting agents. You can phone 0345 464 0079 or email us with the address and a few details, and we’ll give you a fixed price before work begins.
Do I need to be at home?
It depends on the job. For work indoors, someone needs to let us in.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator.
Do I need permission for sand mastic on a listed building?
It’s best to ask your local planning authority first. Like-for-like sand mastic is often the preferred finish but the decision is theirs.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Mapesbury, along with the rest of our area.
What exactly is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
Will there be a smell?
Possibly a little. It fades as the sealant cures, and ventilation helps.
Nearby places to Mapesbury
Other services in Mapesbury
Common problems we fix in Mapesbury
Previous repairs in cement or silicone often trap water or crack away. They don’t move with the timber, and they normally need raking out.
Look out for any of the following:
- Mastic that needs renewing before redecorating
- Mastic dropping out of the joint
- Open joints round the window box
- Weathered mastic on the most exposed windows
If you let a flat or house near Wembley Stadium station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Questions to ask before booking
- Whether you can choose the colour
- Is the old sealant removed completely?
- Whether VAT is included
- Which sealant they’ll use, and why
Keeping the joints in good condition
After the cure time, these simple habits help:
- Check the mastic when you check the paintwork
- Clear gutters so water does not pour onto the windows
- Sort the mastic before the decorators arrive
- Do not paint over the new mastic
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.
Mapesbury homes and the weather
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. Historic houses like Pitzhanger Manor (about 3 miles south) are a reminder that the area around Mapesbury has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
As a London address, Mapesbury can be tricky for parking: let us know about parking bays, permits or a driveway. If you live in an older home near St Michael the Archangel, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Mapesbury is about 1 mile south-east of Wembley, in Greater London. Homes, rented property, offices and hotels in Mapesbury can book us for sand mastic. Every job comes with our one-year guarantee. Mapesbury is one of 764 places in Greater London where we work. London is on our list too, about 9 miles from Mapesbury.
Work in HA9, HA0 and NW10 works the same way as everywhere else we cover. Sand mastic is available to properties on London Road, Harrow Road and Cecil Avenue. We also cover the places around Mapesbury: Tokyngton (1 mile south-east), Stonebridge Park (1 mile south-east), Wembley Park (1 mile north), Wembley (1 mile north-west) and Brent Park (1 mile east). Further out, we also cover London (9 miles south-east), City of Westminster (6 miles south-east), Marylebone (6 miles east), Kensington (5 miles south-east), St Pancras (7 miles east) and Shoreditch (9 miles east).
What’s near Mapesbury
Around Mapesbury, our work takes us to homes and buildings near The Swaminarayan School, Hilton London Wembley pub and St. Raphael's Edible Garden. There’s a railway station in Mapesbury itself: Wembley Stadium station. A little further out are Brent Museum and Archives (2.2 miles east) and Neasden Hospital (0.9 miles east). The countryside around Mapesbury includes Fox Wood and Middle Lake.
What affects the cost of sand mastic
The quote reflects the job in front of us. We take into account:
- How much there is to do
- Any working-time requirements on site
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please call 0345 464 0079 or send us an email and we will talk you through it.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- Access, such as stairs, a lift or height
- The type of property
- The address or postcode of the job
- Photos by email, if that is easy
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved before giving you a price.