Greater London · England
Sand Mastic in Wennington
Sand mastic in Wennington from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Crumbling sand mastic round a window
- Old cement repairs round a window that have failed
- Gaps where the frame meets the masonry
About our sand mastic in Wennington
If your home is listed or in a conservation area, check with your local planning authority whether consent is needed for work to windows. Like-for-like sand mastic is often the preferred finish. We work on brick reveals, sash and case windows and timber door frames, and the jobs we see most are cracked mastic round a front door frame and weathered mastic on the most exposed windows.
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.
There’s a 12-month guarantee on every job, large or small.
- Where
- Wennington (RM13)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How the visit works
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work begins. Most jobs take anything from a few hours to a full day, depending on how many windows. In a London area like Wennington, 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.
- We check the window surrounds and agree which joints need renewing.
- Old, loose mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us if parking is tricky
- Move anything stored near the joints
Ask for a quote
For sand mastic in Wennington, phone 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.
Related advice
What happens if it’s left?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
Why book with us
- We never seal over old sealant
- We leave the area clean and tidy
- 180+ five-star Google reviews
- Fully insured
What the job involves on each surface
Timber door frames
Round a period front door, sand mastic gives the right look.
Stone surrounds
Old stone surrounds are often uneven, so the joint varies in width. Sand mastic is shaped by hand to suit.
Common problems we fix in Wennington
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows.
Signs it’s time to call us include:
- Modern sealant on a period surround
- Mastic dropping out of the joint
- Gaps where the frame meets the masonry
- Window mastic to renew ahead of painting
Letting a property close to Rainham (Essex) station? Then any sash windows need sound mastic to keep draughts and rain out.
What to look for in a quote
- Are they insured?
- Is the old sealant removed completely?
- What happens if they find a problem under the old sealant
- When the joint can take water or movement
DIY sealant or a professional job?
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.
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.
Windows and doors in Wennington
With historic houses such as Rainham Hall (about 1.5 miles north-west) nearby, there’s older building stock in the area around Wennington as well as newer homes. Where a home is older, 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 it’s worth checking before booking.
If you live in an older home near St Mary and St Peter's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. As a London address, Wennington can be tricky for parking: let us know about parking bays, permits or a driveway.
Wennington is about 4 miles south of Hornchurch, in Greater London. Our applicators cover sand mastic for householders, landlords and businesses in Wennington and nearby, as part of our work across Greater London. Across Greater London, we cover 764 places, Wennington among them. London is on our list too, around 14 miles away.
Work in RM13 works the same way as everywhere else we cover. Neighbouring places we cover for sand mastic include Aveley (1 mile east), Hacton (2 miles north), South Ockendon (3 miles east), Upminster Bridge (4 miles north) and Hornchurch (4 miles north). Within a short drive, we also cover London (14 miles west), St Pancras (15 miles west), Shoreditch (13 miles west), Walthamstow (12 miles north-west), Hoxton (13 miles west) and Whitechapel (12 miles west).
Near you in Wennington
Locally, jobs take us to homes and businesses close to Lennard Arms Inn, Wildspace Conservation Park and Harris Academy Rainham, among other places. For rail, the closest station is Rainham (Essex) station, roughly 1.4 miles north-west. Well-known places in the area include St George's Hospital (2.8 miles north) and Erith Museum (2.5 miles south-west). Open spaces near Wennington include Rainham Marshes Nature Reserve.
Quotes for sand mastic in Wennington
We do not publish a price list. The quote depends on:
- The product the joint needs
- The size of the job
- Whether the work is at height
- How many rooms, windows or areas are involved
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or drop us an email.
Helping us quote
When you contact us, it’s useful to know:
- The rough size of the job
- How we’d reach the joints
- The address or postcode of the job
- A few photos by email, if you can
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
Questions from Wennington
I let a flat near Rainham (Essex) station. Can you help?
Yes. We work for landlords and agents as well as homeowners. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll send you a clear quote.
Is Wennington in your area for sand mastic?
Yes, Wennington is within the area we cover. We work across London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Where is Mr Mastic based?
Our base is in Crawley, and we work across South East England, London and Scotland.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Do you guarantee sand mastic work?
You get our 12-month guarantee on every job.
Can you quote for more than one area?
Yes. Tell us about everything you’d like done and you’ll get one quote.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Check the mastic when you check the paintwork
- Go gently near the mastic when preparing windows
- Ask us before painting near the mastic
- Renew mastic before redecorating the windows
Leave the new mastic unpainted, which is the traditional advice. If you are redecorating, ask us first.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.