Greater London · England
Sand mastic for sash & case windows in Romford, Greater London
Sand mastic across Romford and nearby, with old sealant always removed completely.
- Crumbling sand mastic round a window
- A silicone bead on a sash window that spoils the look
- Mastic worn away on windows facing the weather
About our sand mastic in Romford
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s made from sand and a linseed-oil-based binder and built up by hand. On period homes, it looks right where silicone wouldn’t. We work on brick reveals, sash and case windows and stone surrounds, and the jobs we see most are old sand mastic that has cracked, crumbled or fallen out and cracked mastic round a front door frame.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, letting in draughts and water.
Our work is backed for twelve months.
- Location
- Romford (RM1, RM7, RM11, RM2)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Common questions in Romford
I let a flat near Romford station. Can you help?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear price.
Is parking a problem for a job in Romford?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Should I check with the council before work on a listed or conservation-area home?
Yes, it’s worth checking. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Can I choose the sealant colour?
In most cases you can choose. We’ll tell you which colours the right product comes in.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Do you cover Romford?
We do. Romford is part of the area we cover, and the service is the same as everywhere else.
Where do you work from?
We are based in Crawley, and we work across South East England, London and Scotland.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Looking after it afterwards
So the new joints stay in good condition:
- Find out about consent before window work on a listed home
- Avoid patching sand mastic with silicone
- Renew mastic before redecorating the windows
- Get any rot dealt with first
Avoid sealing over the mastic with silicone. If you see a crack, ask us to take a look rather than patching it.
Once mastic starts to crumble, rain gets in. It can soak into the frame and the surrounding masonry so early renewal protects both.
What we do, step by step
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and tidy away. Most jobs take a few hours per window, depending on the condition of the joints. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Keep pets and children clear of the area while we work
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
Ask for a quote
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details and send pictures if you have them.
Read more
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
When to call us in Romford
Scraping and sanding before painting can loosen old mastic. Many people find it crumbling when they prepare the windows.
If you can see any of these, it’s time to have the joints looked at:
- Silicone on a period window that looks wrong
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
- Wind and rain getting in round a sash window
As a London address, Romford can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- How much experience the applicator has
- Are they insured?
- Whether the sealant suits the joint
- How the joint is cleaned and prepared
Different surfaces, different methods
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Sand mastic in Romford: local notes
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Hare Hall (about 1.4 miles north-east) are a reminder that the area around Romford has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as Concordia Academy are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Romford station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Romford is about 12 miles west of Basildon, in Greater London. Wherever you are in the RM1 postcode area, our applicators can take on sand mastic. Our Greater London coverage runs to 764 places, Romford among them. We also work in London, about 13 miles from Romford.
We work across the RM1, RM7, RM11 and RM2 postcode area for sand mastic. If you need sand mastic at a property on High Street, Market Place and Market Link or a nearby road, our applicators can take on the job. Main roads around Romford include the A1251, so getting to you is simple. Nearby, we also carry out sand mastic in Rush Green (1 mile south-west), Collier Row (1 mile north), Rise Park (1 mile north), Becontree Heath (1 mile south-west) and Chadwell Heath (2 miles west). Further out, we also cover London (13 miles south-west), City of Westminster (15 miles west), Marylebone (15 miles west), St Pancras (13 miles west), Shoreditch (12 miles west) and Walthamstow (9 miles west).
Around Romford
Around Romford, our work takes us to homes and buildings near Lodge Farm Park, Frances Bardsley Academy for Girls and The Moon & Stars pub and the streets around them. There’s a railway station in Romford itself: Romford station. Nearby you’ll also find The Brewery (within half a mile south-west) and Oldchurch Hospital (under half a mile south). The countryside around Romford includes The Chase Nature Reserve.
Landlords, agents and businesses in Romford
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
Housing providers, facilities teams and property managers book us too in Romford and across Greater London. We can quote a run of properties together.
When it is not the sealant
We’ll always be straight with you, so here’s what sealant can’t fix:
- Putty and glazing repairs
- Sash cords, weights and draught-proofing of the sashes
- Crumbling stone or brickwork round the window
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Sash and case windows
- Stone surrounds
- Brick reveals
- Tenement windows
- Timber door frames
- Period & listed homes