Greater London · England
Sand mastic for sash & case windows in Crews Hill, Greater London
Sand mastic for Crews Hill, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Wind and rain getting in round a sash window
- Gaps where the frame meets the masonry
- Tired mastic found when preparing windows for paint
Sand mastic in Crews Hill, done properly
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant, and we’ll talk through which suits your home. If you have draughty sash windows at the surround and a silicone bead on a sash window that spoils the look, we can help, whatever the surface.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Crews Hill (EN2)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
How it works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours per window, depending on the condition of the joints, including the tidy-up. In Crews Hill, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
How to prepare
- Tell us about any water getting in
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
Get a quote
If you’re in Crews Hill and need sand mastic, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before any work starts.
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Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Avoid patching sand mastic with silicone
- Ask us before painting near the mastic
- Check with your local planning authority if your home is listed
- Inspect the joints round the windows every year or so
Look at the mastic when you look over the windows. Catching cracks early keeps repairs small.
An open joint round the box lets weather through. Left, the gap tends to get bigger as more mastic falls out.
For landlords and businesses
We work for landlords and letting agents as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
When something else is needed
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Sash cords, weights and draught-proofing of the sashes
- Putty and glazing repairs
- Rotten sashes, sills or window boxes (a joiner’s job)
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly.
Surfaces we seal
- Sash and case windows
- Period & listed homes
- Timber door frames
- Stone surrounds
- Tenement windows
- Brick reveals
What affects the quote in Crews Hill
We quote each job individually. These are the things that affect it:
- The number and length of the joints
- The number of rooms or windows
- Any working-time requirements on site
- Whether there’s mould to deal with
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You’ll know the price before we begin.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- Roughly how big the job is
- Where the job is, and your postcode
- Whether it’s a home or a business
- Any previous sealing or DIY work
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we’ll explain what’s involved before giving you a price.
Questions from Crews Hill
Is Crews Hill in your area for sand mastic?
Yes, Crews Hill is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
Do you work for landlords with property near Crews Hill station?
Yes, rental work is part of what we do. You can call 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.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
What do you need from me for a quote?
The location, the problem and the rough size of the job. If you can, email a few photos.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that usually means someone at home.
Can you match the sealant colour?
Most of the time, yes. We’ll tell you which colours the right product comes in.
What is sand mastic?
It’s the traditional filler for the joint round timber windows and doors. It’s made with sand and a linseed-oil-based binder.
Where are you based?
Mr Mastic is based in Crawley. We cover Crews Hill and the rest of Greater London, along with the rest of our area.
How the job changes by surface
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
Also near Crews Hill
Also in Crews Hill
Sand mastic in Crews Hill: local notes
Historic houses like Forty Hall (about 1.5 miles south-east) are a reminder that the area around Crews Hill 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. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book.
Schools such as St John's CofE Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. In the older streets around Church of St John the Baptist, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Crews Hill can be tricky for parking: let us know about parking bays, permits or a driveway.
Crews Hill is about 3 miles south-west of Cheshunt, in Greater London. Homes, rented property, offices and hotels in Crews Hill is covered for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. Our Greater London coverage runs to 764 places, and Crews Hill is one of them. We also work in London, about 13 miles from Crews Hill.
Jobs for sand mastic in EN2 is quoted and booked the same way as anywhere else. We cover properties on Rosewood Drive, Theobalds Park Road and Whitewebbs Road and the roads around them. Neighbouring places we cover for sand mastic include Clay Hill (1 mile south-east), Gordon Hill (1 mile south-east), Bulls Cross (2 miles east), Forty Hill (2 miles south-east) and Enfield Chase (2 miles south). Further out, we also cover London (13 miles south), City of Westminster (12 miles south), Marylebone (11 miles south), Kensington (13 miles south), St Pancras (11 miles south) and Shoreditch (11 miles south).
Landmarks near Crews Hill
Typical jobs here are in homes near Chace Community School and The Plough pub, among other places. Crews Hill has its own railway station: Crews Hill station. Other landmarks nearby include Chase Farm Hospital (1 mile south) and Museum of Enfield (2.3 miles south). Green spaces nearby include Fir and Pond Woods and Bowyer's Water.
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
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. Everything old must be removed first.