Greater London · England
Chase Cross Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Chase Cross and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Modern sealant on a period surround
- Tired mastic found when preparing windows for paint
- Patchy fillers round a sash window
How we handle sand mastic in Chase Cross
Sand mastic suits most period window surrounds. Newer frames generally get a flexible sealant instead, and we will talk through which suits your home. Common call-outs are for draughty sash windows at the surround and old cement repairs round a window that have failed, on period & listed homes, stone surrounds and tenement windows. Whether you’re looking for a mastic company, a sealant applicator or a sealant contractor in Chase Cross, Mr Mastic can help.
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.
There’s a 12-month guarantee on every job.
- Where
- Chase Cross (RM5, RM1, RM4)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 07833 053749
- Last updated
- 26 October 2026
Landlords, agents and businesses in Chase Cross
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Failed sealant is one of the commonest items on a check-out report. We can quote for more than one property at once.
What we are called out for in Chase Cross
Timber frames move with the seasons. That movement opens up the mastic joint little by little.
It’s worth asking for a quote if you see:
- Mastic that needs renewing before redecorating
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
- Crumbling sand mastic round a window
For site and facilities teams at buildings such as Bower Park Academy, the mastic around its windows and doors needs looking after like any other building’s.
Questions to ask before you book
- Whether you can choose the colour
- Whether they’re fully insured
- What preparation is included
- How much experience the applicator has
How it works
Most of a good job is in the preparation, so that is where we spend the time. Every joint is cleaned and dried before new material goes in. In total, it usually takes 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. Mention any building rules, key holders or managing agents when you book.
- We start by checking each surround and agreeing the joints to renew.
- We rake out the old mastic and clean the joint.
- We pack any deep gaps so the mastic sits at the right depth.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. Whenever you are ready, call 07833 053749 or drop us an email.
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How we quote for sand mastic
Jobs vary more than people expect. What affects the quote:
- Whether the work is at height
- Whether old sealant or filler has to be cut out
- How many areas need sealing
- The product the joint needs
What it costs depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before any work starts.
Helping us quote
There’s no need for technical detail. Just tell us:
- The problem you’ve noticed
- Photos by email, if that is easy
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
Want a quote for sand mastic? Please ring 07833 053749 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Places near Chase Cross
Also in Chase Cross
Common questions in Chase Cross
Can parking be tricky for a visit in Chase Cross?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you cover Chase Cross for sand mastic?
Yes. Our work covers London and the South East, and Chase Cross is part of that. You can phone 07833 053749 or email us and let us know what needs doing.
What information do you need?
Let us know what needs doing and where. We’ll ask anything else we need to know.
Will there be a smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Do you hold any approvals?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where do you work from?
Our base is Crawley. We work across South East England, London and Scotland.
What do you put in the joint?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you work for letting agents?
Yes, we do. We work in homes, commercial premises and hotels, and we’re fully insured.
What the job involves on each surface
Sash and case windows
The mastic round a sash window is on show, so a neat, even finish matters.
Stone surrounds
Stone surrounds suit sand mastic well. The finish blends with the masonry.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
What sand mastic looks like in Chase Cross
With historic houses such as Hare Hall (about 2 miles south-east) nearby, there’s older building stock in the area around Chase Cross as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Chase Cross is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you live in an older home near St James, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Chase Cross is about 2 miles north of Romford, in Greater London. If you need sand mastic in Chase Cross, it’s easy to get a quote: please call 07833 053749 or send us an email. We cover Greater London from our Crawley base, Chase Cross included. We cover 786 towns and villages across Greater London, large and small.
We cover every part of RM5, RM1 and RM4 for sand mastic. If you need sand mastic at a property on Merlin Road, Avelon Road and Vernon Road or a nearby road, we can help. Nearby, we also carry out sand mastic in Havering-atte-Bower (1 mile north-east), Redbridge (2 miles west), Stapleford Abbotts (2 miles north), Lambourne End (3 miles north-west) and Chigwell Row (3 miles west). Further out, we also cover London (14 miles south-west), Marylebone (15 miles south-west), St Pancras (14 miles south-west), Shoreditch (12 miles south-west), Walthamstow (9 miles west) and Hoxton (12 miles south-west).
What’s near Chase Cross
Around Chase Cross, our work takes us to homes and buildings near Havering Country Park, Clockhouse Primary School and Colley Rowe Inn, among other places. For rail, the closest station is Gidea Park station, roughly 2.1 miles south-east of the centre. A little further out are Harold Wood Hospital (2.3 miles south-east) and Romford Shopping Hall (1.8 miles south). Not far away are Bedfords Park.
When it is not the sealant
In fairness, there are a few things sealant won’t fix:
- Sashes that rattle, stick or won’t open
- Damaged stone surrounds
- Timber that has rotted
If in doubt, call 07833 053749 or drop us an email and we will say what we think before you book.
Surfaces we seal
- Tenement windows
- Sash and case windows
- Period & listed homes
- Timber door frames
- Stone surrounds
- Brick reveals