Greater London · England
Gants Hill Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Gants Hill and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
Sand mastic in Gants Hill
Old sand mastic cracks, crumbles and falls out over time and gaps open up round the frame. Renewing it closes the gap and tidies the surround. We work on sash and case windows, tenement windows and stone surrounds, and common reasons people get in touch are cracked mastic round a front door frame and patchy fillers round a sash window.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out.
Every job comes with our 12-month guarantee, wherever you are in Greater London.
- Place
- Gants Hill (IG2, IG6, IG1)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Nearby places to Gants Hill
Also in Gants Hill
The process
We keep the work tidy and contained to the joints we are treating, so you can get on with your day. The job generally takes a few hours per window, depending on the condition of the joints. In a London area like Gants Hill, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- 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.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Mention if the joints have been sealed before
- Keep children and pets away from the work area
- Tell us if parking is tricky
How to get a quote
To get a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before work begins.
Related advice
How we quote for sand mastic
The price is agreed before any work begins. It takes into account:
- The amount of work
- Working hours on commercial sites
- Mould in or behind the old joints
- The number of rooms or windows
The cost depends on the size of the job, how much old material has to come out and access to the work. You will have a clear quote before any work starts, so you know where you stand.
Asking for a quote
When you contact us, it’s useful to know:
- Where the property is
- The rough size of the job
- What’s wrong with the joints now
- Whether it has been sealed before
If you are in Gants Hill and need sand mastic, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
What the job involves on each surface
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. We rake it out and renew it.
Your questions about sand mastic in Gants Hill
Can parking be tricky for a visit in Gants Hill?
Parking in Gants Hill, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can you do sand mastic in Gants Hill?
Yes. Our work covers London and the South East, and Gants Hill is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
How long does sand mastic take to harden?
The surface skins quite quickly and it hardens fully over a longer time. The weather and joint depth both affect it.
How long will you be here?
A typical job takes a few hours for a single window, longer for several, including preparation and clearing up. We’ll confirm how long when we quote.
What does sand mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Can tenants book the work?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we will advise.
Aftercare tips
After the cure time, these simple habits help:
- Ask the planning authority about consent for listed or conservation-area homes
- Don’t run silicone over sand mastic
- Keep sills and gutters clear so water drains away
- Take care around the mastic when scraping paint
Do not touch or press the mastic while it hardens. It skins over quickly but needs longer to fully harden.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.
Why act early in Gants Hill
Not every filler suits an old window surround. Sand mastic is the like-for-like choice and that can be important for listed homes. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Gants Hill, the repair is bigger than a sealant job.
Combining jobs into one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Why us?
- Fully insured
- An ARBOMaster approved applicator
- Trusted Arbo and Everbuild sealants
- Over 20 years’ experience
Read what affects the cost or customer reviews.
What sand mastic looks like in Gants Hill
Historic houses like Valentines Mansion (about 0.4 miles south-west) are a reminder that the area around Gants Hill has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to St George's Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. As a London address, Gants Hill can be tricky for parking: let us know about parking bays, permits or a driveway. If you let a flat or house near Ilford station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Gants Hill is about 3 miles north-east of Forest Gate, in Greater London. Gants Hill gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Gants Hill is one of 764 places in Greater London where we work for sand mastic. There’s also a page for London, roughly 9 miles from Gants Hill.
Here we cover the IG2, IG6 and IG1 postcode area for sand mastic. If you need sand mastic at a property on Bute Road, Perth Road and Shere Road or anywhere close by, our applicators can take on the job. Main roads around Gants Hill include the A123, which makes travel easy. Neighbouring places we cover for sand mastic include Newbury Park (1 mile east), Barkingside (1 mile north-east), Redbridge (1 mile west), Cranbrook (1 mile south-west) and Ilford (1 mile south). Larger places within reach include London (9 miles south-west), City of Westminster (11 miles south-west), Marylebone (10 miles south-west), Kensington (13 miles south-west), St Pancras (9 miles south-west) and Shoreditch (7 miles south-west).
Local landmarks in Gants Hill
Typical jobs here are in homes near Valentines Park and Valentines High School and the streets around them. For rail, the closest station is Ilford station, about 1.2 miles south of the centre. A little further out are Stratford Centre (3.9 miles south-west) and Goodmayes Hospital (1.7 miles east). For a walk, there’s Hollow Pond and Hainault Lodge.
Landlord and commercial work in Gants Hill
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
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.