Greater London · England
Sand mastic for sash & case windows in Thamesmead, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Thamesmead, with a 12-month guarantee on every job. Ask us for a quote.
- Failed mastic on an exposed elevation
- Open joints round the window box
- Gaps round a timber door in stone or brick
Common questions in Thamesmead
Do you work for landlords with property near Abbey Wood station?
Yes, we work for letting agents and landlords. Just phone 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Do you cover Thamesmead for sand mastic?
Yes. We work across London and the South East, and Thamesmead is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Can I add another job to the visit?
Yes. More than one area can be quoted together.
What do you put in the joint?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we will explain our choice.
How long does sand mastic take?
Typically it takes a few hours for a single window, longer for several. Larger jobs naturally take longer.
Can new sealant go over the old?
No, because it fails. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
How we handle sand mastic in Thamesmead
Silicone on a period window often looks wrong and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. Common call-outs are for cracked mastic round a front door frame and failed mastic on an exposed elevation, across tenement windows, sash and case windows and period & listed homes.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
The work is covered for a year after we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Where
- Thamesmead (SE28, SE2, DA18)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Timber door frames
Door frames get knocked and soaked and the mastic can crack early. It’s renewed by hand.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
How the visit works
We bring everything the job needs with us. After a quick look at the joints together, we protect the area and start. It normally takes anything from a few hours to a full day, depending on how many windows. In Thamesmead, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Keep children and pets away from the work area
- Clear items away from the joints we’re working on
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
If you are in Thamesmead and need sand mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
Honest limits
A few problems are outside what sealant work can do:
- Masonry that needs repairing
- Whether work needs listed building consent
- Sashes that need overhauling
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Stone surrounds
- Tenement windows
- Brick reveals
- Period & listed homes
- Sash and case windows
- Timber door frames
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Keep modern sealant off the mastic
- Find out about consent before window work on a listed home
- Renew mastic before redecorating the windows
- Get any rot dealt with first
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Crumbling mastic lets rain into the joint. It can soak into the frame and the surrounding masonry so early renewal protects both.
When to call us in Thamesmead
Previous repairs in cement or silicone often trap water or crack away. They do not suit the joint and we normally remove them.
Any of these means the joints need attention:
- Cement or filler used on old window joints that has cracked
- Tired mastic found when preparing windows for paint
- Open joints round the window box
- Modern sealant on a period surround
Thamesmead is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What your quote should include
- How the colour is chosen
- What insurance they hold
- What the quote includes, VAT included or not
- Whether the sealant suits the joint
Nearby places to Thamesmead
Also in Thamesmead
For landlords and businesses
Letting agents and landlords in Thamesmead can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements.
Windows and doors in Thamesmead
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. Historic houses like Eastbury Manor House (about 2.4 miles north-west) are a reminder that the area around Thamesmead has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Homes close to St Paul include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. Letting a property close to Abbey Wood station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Thamesmead is about 2 miles north-east of Plumstead, in Greater London. For sand mastic in and around Thamesmead, please call 0345 464 0079 or send us an email for a quick quote. We’re based in Crawley and cover Greater London. Across Greater London, we cover 764 places, and Thamesmead is one of them. We also work in London, about 10 miles from Thamesmead.
We work across SE28, SE2 and DA18 for sand mastic. You’ll find streets such as Attlee Road, Aisher Road and Carlyle Road. If you are just outside Thamesmead, we cover Crossness (1 mile south-east), Dagenham Dock (1 mile north-east), Barking Riverside (1 mile north-west), Thames View Estate (2 miles north-west) and Hornchurch Marshes (2 miles north-east). Further out, we also cover London (10 miles west), City of Westminster (12 miles west), Marylebone (12 miles west), Kensington (14 miles west), St Pancras (11 miles west) and Shoreditch (9 miles west).
Around Thamesmead
Around Thamesmead, our work takes us to homes and buildings near Harris Garrard Academy and Abbey Wood Park, among other places. The nearest railway station is Abbey Wood station, about 1 mile south of the centre. Other landmarks nearby include Greenwich Borough Museum (1.7 miles south-west) and Gallions Reach Shopping Park (2 miles west). Not far away are Crossness Nature Reserve.
Why it’s worth doing now in Thamesmead
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic suits the building and finishes neatly against the masonry. In a flat in Thamesmead, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first.
Why book with us
- Homes, businesses and hotels
- 20+ years of sealant experience
- Old sealant always removed completely
- Full insurance on every job
Take a look at what affects the cost or what customers say.