Greater London · England
Streatham Park Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Streatham Park and across Greater London. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Weathered mastic on the most exposed windows
- Tired mastic found when preparing windows for paint
- Silicone on a period window that looks wrong
Landlord and commercial work in Streatham Park
We also work for property managers and facilities teams in Streatham Park and across Greater London. We can quote a run of properties together, and we’re fully insured for the work.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Sand mastic in Streatham Park
A silicone bead around a sash window can look out of place and does not suit the building. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. We work on period & listed homes, stone surrounds and tenement windows, and people most often call us about crumbling sand mastic round a window and cement or filler used on old window joints that has cracked.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Streatham Park as anywhere.
Our work is backed for twelve months, in Streatham Park and everywhere else we cover.
- Place
- Streatham Park (SW16, SW17, SW12)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Aftercare is simple:
- Keep sills and gutters clear so water drains away
- Look over the window mastic once a year
- Sort the mastic before the decorators arrive
- Have rotten timber repaired before new mastic goes in
Avoid painting over the new mastic, as traditional guidance advises. If you’re redecorating, ask us first.
It’s best to renew mastic before painting the windows. Painting over failed mastic hides the problem for a while.
Common questions in Streatham Park
Do you work for landlords with property near Streatham station?
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 send us an email with the details for a clear quote.
Is parking a problem for a job in Streatham Park?
Parking in Streatham Park, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
What does sand mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
How long does sand mastic take to go off?
Not straight away. It skins first and hardens fully later and we will give you an idea for your job.
What exactly is sand mastic?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and shaped to suit the surround.
What information do you need?
Only a few details: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or drop us an email.
Is sand mastic better than silicone for my windows?
We’ll help you decide. Period homes often look best with sand mastic and newer frames suit modern sealant.
How long will you be here?
Most jobs take a few hours per window, depending on the condition of the joints, including preparation and clearing up. We’ll confirm how long when we quote.
Nearby places to Streatham Park
What else we do in Streatham Park
When to call us in Streatham Park
Sand mastic slowly weathers. It dries out, cracks and loses its grip from the frame or the masonry.
Signs it’s time to call us include:
- Window mastic to renew ahead of painting
- Draughts and rain around sash boxes
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
If you let a flat or house near Streatham station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Questions to ask before booking
- Whether they’re fully insured
- Who turns up on the day
- What happens if the job turns out different
- Is VAT in the price?
Surface by surface
Timber door frames
Doors face weather and wear, so their mastic can fail sooner. We rake it out and renew it.
Period and listed homes
A traditional finish suits a period property.
What we do, step by step
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. Expect the work to take anything from a few hours to a full day, depending on how many windows, and we explain the cure time before we leave. In a London area like Streatham Park, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- We look at the surrounds with you and agree the joints to renew.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
- Let us know about stairs, lifts or work at height
Get a quote
For sand mastic in Streatham Park, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Read more
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
What we can’t put right
Before you book, it’s worth knowing the limits:
- Putty and glazing repairs
- Decisions on consent for listed homes
- Masonry that needs repairing
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Sash and case windows
- Timber door frames
- Period & listed homes
- Stone surrounds
- Tenement windows
- Brick reveals
Sand mastic in Streatham Park: local notes
Historic houses like Kingswood House (about 2.6 miles east) are a reminder that the area around Streatham Park 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. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
Homes close to Parish Church of St Alban include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in. Schools such as St Leonard's Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Streatham Park is about 1 mile west of Streatham, in Greater London. Every kind of property in Streatham Park is covered for sand mastic. The work is guaranteed for a year. Across Greater London, we cover 764 places, and Streatham Park is one of them.
Postcode districts we cover here for sand mastic: SW16, SW17 and SW12. Whether your property is on Lewin Road, Rydal Road and Natal Road or anywhere close by, we can help. If you’re just outside Streatham Park, we cover Furzedown (1 mile south-west), Streatham (1 mile east), Tooting (1 mile west), Tooting Bec (1 mile west) and Hyde farm estate (1 mile north). Further out, we also cover London (5 miles north), City of Westminster (6 miles north), Marylebone (6 miles north), Kensington (6 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Landmarks near Streatham Park
In Streatham Park, that means homes and buildings near Furzedown Secondary School, Streatham Common and Graveney School and the streets around them. Streatham Park’s nearest station is Streatham station, about 0.5 miles east. A little further out are London Sewing Machine Museum (0.9 miles north-west) and Southside Wandsworth (2.9 miles north-west). Not far away are Battersea Park Lake and Knight's Hill.