Greater London · England
Sand mastic for sash & case windows in Brentham Garden Suburb, Greater London
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Brentham Garden Suburb, backed by a 12-month guarantee. Ask us for a quote.
- Gaps where the frame meets the masonry
- Cement or filler used on old window joints that has cracked
- Mastic round period door frames that has failed
Sand mastic for homes and businesses in Brentham Garden Suburb
Sand mastic doesn’t last for ever and gaps open up round the frame. We rake it out and renew it and tidies the surround. Common call-outs are for window mastic to renew ahead of painting and crumbling sand mastic round a window, on period & listed homes, brick reveals and sash and case windows.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Brentham Garden Suburb is something to talk through when you book.
A 12-month guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- Brentham Garden Suburb (W5, W13, UB6)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
New sealant cannot fix everything, and we will tell you before we start. It won’t solve:
- Decayed frames that need repair
- Masonry that needs repairing
- Broken panes
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before you book.
Where we work in Brentham Garden Suburb
- Timber door frames
- Tenement windows
- Period & listed homes
- Stone surrounds
- Brick reveals
- Sash and case windows
What affects the cost of sand mastic
The price is agreed before any work begins. It takes into account:
- How many areas need sealing
- The number and length of the joints
- Whether there’s mould to deal with
- Working hours on commercial sites
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
To help us quote quickly, please include:
- If someone has resealed it before
- What’s wrong with the joints now
- If it’s domestic, commercial or a hotel
- Roughly how big the job is
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
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How the visit works
Every visit runs the same way: we look at the joints together, protect the area around them, carry out the job and tidy away. It usually takes anything from a few hours to a full day, depending on how many windows. For a job in Brentham Garden Suburb, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- 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.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Where the joints are inside, avoid wetting them before we arrive
- Clear items away from the joints we are working on
Getting a quote
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details, and photos are welcome.
Related advice
Common questions in Brentham Garden Suburb
Can parking be tricky for a visit in Brentham Garden Suburb?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Can you help a landlord with a rental near Ealing Broadway station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will send you a clear quote.
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.
When will the new mastic be hard?
It takes a while. The skin forms first, and the full set comes later and we’ll give you an idea for your job.
Which is right for my windows, sand mastic or modern sealant?
Sand mastic normally suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we’ll explain why.
Is the work guaranteed?
All our work has a one-year guarantee, and we are fully insured.
Can I choose the sealant colour?
In most cases you can choose. We’ll tell you which colours the right product comes in and agree one before we start.
Can I do it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
Signs you need sand mastic in Brentham Garden Suburb
Age is the main cause. Even well-laid mastic needs renewing in time and how long it lasts depends on the weather it faces.
People generally contact us when they notice something like this:
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Wind and rain getting in round a sash window
- Patchy fillers round a sash window
For site and facilities teams at buildings such as St Gregory's Catholic Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- What guarantee comes with the work
- How the colour is chosen
- Who does the work, and how experienced they are
- What preparation is included
Can I do it myself?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can go on one quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Ask the planning authority about consent for listed or conservation-area homes
- Do not run silicone over sand mastic
- Go gently near the mastic when preparing windows
- Keep sills and gutters clear so water drains away
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Gaps round a sash box let in draughts and rain. The longer it’s left, the more the joint opens as more mastic falls out.
Frames and glazing around Brentham Garden Suburb
With historic houses such as Pitzhanger Manor (about 1.1 miles south) nearby, there’s older building stock in the area around Brentham Garden Suburb as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around Church of St Barnabas, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Brentham Garden Suburb is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Brentham Garden Suburb is about 1 mile north of Ealing, in Greater London. Anywhere in W5, our applicators can take on sand mastic. Across Greater London, we cover 764 places, Brentham Garden Suburb among them. You can also see our page for London, roughly 9 miles from Brentham Garden Suburb.
We cover every part of the W5, W13 and UB6 postcode area for sand mastic. Sand mastic is available to properties on Kings Road, Selby Road and Marsh Road. Neighbouring places we cover for sand mastic include Pitshanger (1 mile west), Perivale (1 mile north-west), Ealing (1 mile south), Hanwell (2 miles south-west) and South Ealing (2 miles south). We also work in nearby towns such as London (9 miles east), City of Westminster (7 miles east), Marylebone (7 miles east), Kensington (5 miles east), St Pancras (8 miles east) and Shoreditch (10 miles east).
Around Brentham Garden Suburb
We work in homes and buildings around Ealing Independent College, Library for Iranian Studies and St Benedict's School, among other places. Nearby too are Castle Bar Park (1 mile west) and Brentham Clubhouse pub (within half a mile north-west). The closest station to Brentham Garden Suburb is Ealing Broadway station, about 0.9 miles south. Other landmarks nearby include London Transport Museum Depot (1.9 miles south-east) and Central Middlesex Hospital (1.7 miles east). For a walk, there’s Castlebar Hill and Middle Lake.