Custom House construction mastic
Planning work on a mastic package in Custom House? We look at it, seal it with the right product and hand it over with a 12-month guarantee.
- Failed sealant in an existing building being refurbished
- Sealant knocked or painted over by other trades
- Perimeter gaps outside the sealant’s range
Need construction mastic in Custom House?
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Diagnose, treat, sign off
In a busy building, we agree a sequence with your contact so the disruption stays in one area at once. Each section is protected, cleaned back and sealed, then handed back before the next one starts. All of Greater London is in the ULEZ, and kerbside space in Custom House can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- First we look at the scope on site or from drawings.
- A fixed quote sets out scope, products and phasing.
- Site paperwork is confirmed and our CSCS-carded applicators are inducted.
- Sealing follows the programme as areas are released.
- Problems we find, such as oversized gaps, are raised right away.
- The package is closed out, snags cleared and backed by our 12-month guarantee.
Getting the site ready
- Move anything stored against the joints
- Send any specification or drawings in advance
- Let us know about inductions and permits
Quotes
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to phone 01277 525 020 or email us with what you know.
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How we handle construction mastic in Custom House
We work to the specification and the programme. If a product is named, that’s what goes in. Joint widths, backing, primers and tooling follow the manufacturer’s guidance, so the joints perform as the designer intended. If you have a mastic package split between trades with no clear owner and existing joints on a refurb that need cutting out and resealing, we can help, whatever the surface. A single leaking joint is often how a building in Custom House first comes to us: we check the joints around it and give you an honest view of what needs doing now and what can wait.
Building sites in London tend to be tight: limited storage, booked deliveries and access shared with other trades. We fit around the programme, sealing each elevation or floor as other trades hand over.
We stand behind the joints we seal: 12 months, guaranteed. That covers our preparation and application.
- Location
- Custom House (E16, E13)
- Wider area
- Greater London
- Cover
- 12 months on every job
- Price
- Quoted before any work starts
- Call
- 01277 525 020
- Updated
- 3 November 2026
Custom House: questions and answers
Could you schedule work at a campus like Ravensbourne University London for the vacation?
Yes. Tell us the term dates, vacation periods and access windows, and we will plan the work around them. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
Can you work in a London building with booked loading and goods-lift slots?
Yes, we plan every London job around the building’s own access rules. The building manager’s rules go straight into our method.
Will you come and look before quoting?
It depends on the job. Straightforward work can often be priced from photos and measurements, while larger or less clear jobs get a site visit first.
Do you do internal caulk as well as external mastic?
It depends on the specification, but most packages include frame perimeters, sanitary and kitchen joints, caulking where specified and a snagging pass.
Will you just go over the old sealant?
No, never. Overlaying old sealant is a frequent cause of early failure, so it all comes out first.
Does the weather affect the work?
Outside, yes. Sealant needs a dry joint and a temperature within the product’s range, so frost, rain or cold mornings can delay outside work. Internal work is rarely affected.
How do we ask for a quote?
The quote form is the simplest route, though you can also phone 01277 525 020 or email a schedule or drawings. Include photographs or drawings if you have them.
Work for main contractors and building owners
Main contractors use us as their sealant subcontractor on new-build and refurbishment projects. Programme, specification and site rules come first, and our applicators hold CSCS cards.
FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we will confirm them with the quote.
How the quote is worked out
A fixed quote reflects the actual work. It takes account of:
- Removal of failed or old sealant
- Backing rod, priming and other preparation
- How much there is to seal
- Specialist products, such as fire-rated or hygienic sealants
No two sites price the same: joint size, product, access and site hours all play a part. Send the details and a fixed figure follows.
What to include in your enquiry
Diagnosis starts before we arrive. Tell us:
- What the building is and how it’s used
- Drawings or a marked-up plan, if available
- A wide shot and a close-up of the area
- How the joints are reached, and at what height
We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To start the process, ring 01277 525 020 or email a schedule or drawings.
Site staff or a sealant specialist?
There’s also the paperwork. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and our CSCS-carded applicators are used to working under those rules.
Redoing a failed joint normally costs more than getting it right at the outset, since all of it has to come out and the faces be cleaned back again. That’s why many clients bring in a specialist from the beginning.
Maintenance after handover
For the best life from the joints:
- Record the products used in the O&M file
- Keep scrapers and abrasive pads off new beads
- Flag uneven or tapered frame gaps early
- Ask for joint and product checks before the package is urgent
Expect some settlement in the first months. Flexible sealants in the right joints handle normal movement. If that happens, let us know.
In wet areas, a weak sanitary joint shows up quickly once the building is occupied. Water gets behind trays, vanity tops and panels. Proper preparation, with the right silicone first time, keeps it off the defects list.
Also near Custom House
What else we do in Custom House
Contractors’ notes for Custom House
Site traffic in Custom House falls within London’s ULEZ, like everywhere else in Greater London. Delivery slots and scarce storage shape how and when the mastic goes in. Custom House has a good number of hotels close by, all within 2 miles. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up.
Hotels like Sunborn Hotel, less than half a mile west of Custom House, rarely close for long, so refurbishment mastic is phased floor by floor. On a campus such as Ravensbourne University London, which lies west of Custom House, new teaching buildings and residences are usually built and refurbished around the academic year.
Custom House is about 1 mile south of Canning Town, in Greater London. Custom House sits inside our coverage, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. We work across 764 places in Greater London, large and small.
Business premises anywhere in E16 and E13 are within our area for mastic packages. Streets here include Tree Road, Ethel Road and Booth Road, and sites on any of them can send details for a fixed quote. Being close to the A1020, Custom House is straightforward for us to reach. Just outside Custom House, we also work in 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). Further afield, our area takes in 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).
Landmarks near Custom House
Locally, jobs take us to sites close to Thames Barrier Park, The Royal Docks Community School and Royal Docks Academy. Custom House has its own railway station: Custom House station. Well-known places in the area include Gallions Reach Shopping Park (2.2 miles east) and Charlton Athletic Museum (1.5 miles south). The countryside around Custom House includes Gilbert's Pit and Tower Hill.
Signs you need construction mastic in Custom House
Value-engineered products sometimes end up in the wrong joints. A general-purpose silicone on a facade or a caulk in a wet area won’t perform like the specified product. We stick to the specified product, or put any alternative to you first.
Site and facilities staff are often the first to spot these:
- Frame perimeters left unsealed or poorly sealed
- Snag items on joints that need redoing before handover
- Different trades sealing to different standards
- Failed sealant in an existing building being refurbished
For contractors refurbishing units at places like Greenshields Industrial Estate (0.5 miles south-west of Custom House), the mastic covers cladding panels, roller-door and window perimeters.
Before you book anyone
- The terms of the workmanship guarantee
- The named product and why it was chosen
- Whether their applicators hold CSCS cards
- Their plan for phasing and protecting the area