Greater London · England
Sand mastic for sash & case windows in Hatch End, Greater London
Professional sand mastic in and around Hatch End, with every bit of old sealant taken out first.
- Gaps round a timber door in stone or brick
- Draughty sash windows at the surround
- Mastic that needs renewing before redecorating
Sand mastic for homes and businesses in Hatch End
Sand mastic does not last for ever and gaps open up round the frame. We rake it out and renew it so the surround looks right again. We work on tenement windows, brick reveals and timber door frames, and the jobs we see most are gaps round a timber door in stone or brick and silicone on a period window that looks wrong.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Hatch End is something to talk through when you book.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Hatch End (HA5, HA2, HA3)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Why it’s worth doing now in Hatch End
Not every filler suits an old window surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. In London conversions, one flat’s bathroom is often above another flat’s ceiling, 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.
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or send us an email.
Why book with us
- Homes, businesses and hotels
- Rated 4.9 stars on Google
- Fully insured
- Anti-fungal silicone where joints get wet
Read our cost guide or customer reviews.
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 fails, we can still redo it.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
How the job changes by surface
Stone surrounds
The stone is treated with care when the old mastic comes out.
Brick reveals
Loose mastic comes out and deep gaps are packed before the new mastic goes in.
When something else is needed
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Planning or listed building consent (your local planning authority decides)
- Cracked or broken glass
- Damaged stone surrounds
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Timber door frames
- Period & listed homes
- Tenement windows
- Stone surrounds
- Brick reveals
- Sash and case windows
How the visit works
We work through the job in order: protect, prepare, seal, tidy. Typically it takes a few hours per window, depending on the condition of the joints and we leave things clean and tidy. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- 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.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
- Mention any tricky access
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, call 0345 464 0079 or send us an email.
Read more
What sand mastic looks like in Hatch End
With historic houses such as Headstone Manor (about 1 mile south-east) nearby, there’s older building stock in the area around Hatch End as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
As a London address, Hatch End can be tricky for parking: let us know about parking bays, permits or a driveway. Letting a property close to Hatch End station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. For an older house near a landmark such as Pinner Baptist Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Hatch End is about 4 miles south of Watford, in Greater London. Every kind of property in Hatch End can book us for sand mastic, old or new, large or small. The work is guaranteed for a year. Across Greater London, we cover 764 places, Hatch End among them. There’s also a page for London, roughly 14 miles from Hatch End.
We cover every part of HA5, HA2 and HA3 for sand mastic. Streets in the area include Love Lane, Moss Lane and Tudor Road. Neighbouring places we cover for sand mastic include Headstone (1 mile east), South Oxhey (2 miles north-west), Harrow Weald (2 miles east), Carpenders Park (2 miles north) and Belmont (2 miles east). Further out, we also cover London (14 miles south-east), City of Westminster (11 miles south-east), Marylebone (11 miles south-east), Kensington (10 miles south-east), St Pancras (12 miles south-east) and Shoreditch (14 miles east).
What’s near Hatch End
Typical jobs here are in homes near The Moon & Sixpence pub, Nower Hill High School and Headstone Manor Recreation Ground and the streets around them. The closest station to Hatch End is Hatch End station, about 0.6 miles north of the centre. Nearby you will also find Heath Robinson Museum (0.8 miles south-west) and Hilfield Castle (4 miles north-east). Green spaces nearby include Harrow Weald Common and Northala Fields.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Keep modern sealant off the mastic
- Have rotten timber repaired before new mastic goes in
- Go gently near the mastic when preparing windows
- Check with your local planning authority if your home is listed
Avoid painting over the new mastic, which is the traditional advice. If you are redecorating, ask us first.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry, so renewing it early is worth it.
Hatch End questions
I let a flat near Hatch End station. Can you help?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Can you do sand mastic in Hatch End?
Yes, Hatch End is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Do I need to be at home?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
When will the new mastic be hard?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
Where is Mr Mastic based?
We are based in Crawley, and we work across South East England, London and Scotland.
Are you fully insured?
Yes. We are fully insured for every job we do.
What information do you need?
A short description and the location, with photos by email if possible. We’ll ask anything else we need to know.
Places near Hatch End
What else we do in Hatch End
Work for landlords, hotels and businesses
We work for landlords and letting agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.