Greater London · England
Sand Mastic in Gallows Corner
Professional sand mastic in and around Gallows Corner, with every bit of old sealant taken out first and a 12-month guarantee.
- Mastic worn away on windows facing the weather
- Cracked mastic round a front door frame
- Mastic dropping out of the joint
Different surfaces, different methods
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
Timber door frames
Round a period front door, sand mastic gives the right look.
About our sand mastic in Gallows Corner
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s a mix of sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. If you’re dealing with mastic worn away on windows facing the weather and modern sealant on a period surround, we can put it right.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
Every job is covered by our one-year guarantee.
- Location
- Gallows Corner (RM3, RM2, RM11)
- Region
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Ask a joiner to look at soft timber first
- Avoid heavy scraping on the mastic joint
- Make sure water runs off the sill
- Check the mastic when you check the paintwork
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.
Nearby places to Gallows Corner
What else we do in Gallows Corner
The process
On the day, we start by going over the job with you. Surfaces next to the work are protected before any work begins. Most jobs take a few hours for a single window, longer for several. In a London area like Gallows Corner, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First we agree which joints need doing.
- 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.
Preparing for the visit
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- Plan for the work area to be out of bounds to pets and children
How to get a quote
Need a quote? Please call 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Landlord and commercial work in Gallows Corner
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Common problems we fix in Gallows Corner
Some old mastic was never deep enough. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Most people get in touch after spotting one of these:
- Cement or filler used on old window joints that has cracked
- Draughts and rain around sash boxes
- Gaps between timber frames and stone or brick
- Old sand mastic that has cracked, crumbled or fallen out
For landlords with property near Gidea Park station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Comparing quotes
- When the joint can take water or movement
- Which colour the sealant will be
- Whether all the old sealant comes out first
- What insurance they hold
What we can’t put right
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Decayed frames that need repair
- Masonry that needs repairing
- Whether work needs listed building consent
If you are not sure, just ring 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Tenement windows
- Brick reveals
- Stone surrounds
- Period & listed homes
- Sash and case windows
- Timber door frames
Windows and doors in Gallows Corner
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. With historic houses such as Hare Hall (about 0.5 miles south) nearby, there’s older building stock in the area around Gallows Corner as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like Royal Liberty School? Then its window and door frames need their mastic kept sound, just like a home’s. For an older house near a landmark such as St Michael and All Angels Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Gallows Corner is about 2 miles north-east of Romford, in Greater London. Jobs in Gallows Corner get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Greater London, we cover 764 places, and Gallows Corner is one of them. We also work in London, around 15 miles away.
We cover every part of the RM3, RM2 and RM11 postcode area for sand mastic. Sand mastic is available to properties on Ewan Road, Briar Road and Bell Avenue. Neighbouring places we cover for sand mastic include Gidea Park (1 mile west), Ardleigh Green (1 mile south), Harold Wood (1 mile east), Heath Park (1 mile south) and Emerson Park (1 mile south-east). Within a short drive, we also cover London (15 miles south-west), St Pancras (15 miles west), Shoreditch (13 miles west), Walthamstow (10 miles west), Hoxton (13 miles west) and Whitechapel (13 miles south-west).
Around Gallows Corner
We work in homes and buildings around Havering College of Further and Higher Education, Ardleigh Green Junior School and Raphael Park and the streets around them. For rail, the closest station is Gidea Park station, roughly 0.8 miles south-west. Other landmarks nearby include Upminster Tithe Barn Museum of Nostalgia (2.6 miles south-east) and Harold Wood Hospital (0.6 miles east). Green spaces nearby include Bedfords Park.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Your questions about sand mastic in Gallows Corner
Is parking a problem for a job in Gallows Corner?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
I let a flat near Gidea Park station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Can I paint the new mastic?
The usual advice is to leave sand mastic unpainted. Ask us before you decorate around it and we’ll talk you through it.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little.
Can new sealant go over the old?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
Where is Mr Mastic based?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. Once the silicone is out and the joint prepared we point it with sand mastic.