Greater London · England
Sand Mastic in Custom House
Problem with your window and door surrounds in Custom House? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Gaps where the frame meets the masonry
- Crumbling sand mastic round a window
- Silicone on a period window that looks wrong
What the job involves on each surface
Brick reveals
We rake out the old mastic and pack deep voids before the new mastic goes in.
Stone surrounds
The stone is treated with care when the old mastic comes out.
Sand mastic for homes and businesses in Custom House
Silicone on a period window often looks wrong and doesn’t suit the building. Sand mastic is the traditional choice and we can swap the silicone for it. If you have patchy fillers round a sash window and weathered mastic on the most exposed windows, we can put it right.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Custom House as anywhere.
There’s a 12-month guarantee on every job, large or small.
- Location
- Custom House (E16, E13)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Questions from Custom House
Is parking a problem for a job in Custom House?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you cover Custom House for sand mastic?
Yes. We work across London and the South East, and Custom House is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Do you guarantee sand mastic work?
There’s a 12-month guarantee on every job, sand mastic included.
Can you do several jobs on one visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient.
How long does sand mastic take?
Most jobs take a few hours per window, depending on the condition of the joints, including preparation and clearing up. We will confirm how long when we quote.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
Are you fully insured?
Yes. We’re fully insured.
What exactly is sand mastic?
A traditional pointing material made from sand and a linseed-oil-based binder for the joint between timber frames and masonry.
Keeping the joints in good condition
Aftercare is simple:
- Find out about consent before window work on a listed home
- Go gently near the mastic when preparing windows
- Have rotten timber repaired before new mastic goes in
- Do not run silicone over sand mastic
Keep paint scrapers and sanders off the mastic when redecorating. It can be damaged by heavy scraping.
Small cracks are a sign the mastic is ageing. It’s easier to renew it before it drops out.
Places near Custom House
Also in Custom House
How the visit works
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes anything from a few hours to a full day, depending on how many windows, depending on the size of the job. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Custom House. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- We dress the finish so it sits neatly against the masonry.
Before we arrive
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
- For business premises, tell us about site rules or sign-in
How to get a quote
Need a quote? Please phone 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
When something else is needed
Before booking, it’s worth knowing the limits too:
- Sash cords, weights and draught-proofing of the sashes
- Crumbling stone or brickwork round the window
- Rotten sashes, sills or window boxes (a joiner’s job)
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Surfaces we seal
- Brick reveals
- Tenement windows
- Sash and case windows
- Timber door frames
- Period & listed homes
- Stone surrounds
Landlord and commercial work in Custom House
Landlords and agents in Custom House can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
Frames and glazing around Custom House
Historic houses like Queen's House (about 2.3 miles south-west) are a reminder that the area around Custom House 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. 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.
For site and facilities teams at buildings such as St Joachim's Catholic Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near St Matthew's Church, the joint between an old wall and a newer frame is usually the first place rain gets in. Custom House is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Custom House is about 1 mile south of Canning Town, in Greater London. Custom House gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Custom House is one of 764 towns and villages in Greater London we cover for sand mastic.
Jobs for sand mastic in E16 and E13 works the same way as everywhere else we cover. Sand mastic is available to properties on Tree Road, Ethel Road and Booth Road. Being close to the A1020, Custom House is simple for us to get to. Neighbouring places we cover for sand mastic include West Silvertown (1 mile south-west), Silvertown (1 mile south), Canning Town (1 mile north), Royal Docks (1 mile east) and Limmo Peninsula (1 mile west). Larger places within reach include London (5 miles west), City of Westminster (8 miles west), Marylebone (8 miles west), Kensington (10 miles west), St Pancras (6 miles west) and Shoreditch (5 miles west).
Around Custom House
Locally, jobs take us to homes and businesses close to Thames Barrier Park, The Royal Docks Community School and Royal Docks Academy, among other places. There’s a railway station in Custom House itself: Custom House station. Nearby you’ll also find Gallions Reach Shopping Park (2.2 miles east) and Charlton Athletic Museum (1.5 miles south). For a walk, there’s Gilbert's Pit and Tower Hill.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
What affects the cost of sand mastic
We do not publish a price list, because no two jobs are the same. The quote depends on:
- How much there is to do
- Whether there’s mould to deal with
- The old material and how stubborn it is
- The number of rooms or windows
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- What’s wrong with the joints now
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- Where the job is, and your postcode
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.