Construction and new-build mastic in Downham, Greater London
Need construction mastic in Downham? Send us the details for a fixed quote, backed by a 12-month guarantee on the work.
- A long mastic snag list close to completion
- Missed perimeter joints on a new elevation
- Old sealant on a refurbishment that needs stripping before new work
Construction mastic for Downham sites
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Facades, frames and programmes in Downham
As part of Greater London, Downham is inside the ULEZ, which applies to every van on site. Delivery slots and scarce storage shape how and when the mastic goes in. Several hotels sit less than 2 miles from Downham. Hotel schemes tend to have fixed reopening dates, so the mastic is programmed tightly with the other trades.
Recladding or extending a unit at a site like Chiltonian Industrial Estate, 1.7 miles north of Downham, brings panel joints and frame perimeters into the programme. Hotel extensions and refits, at places such as Bromley Court Hotel, 0.6 miles to the south of Downham, normally run between busy periods, so the sealing is squeezed into short windows.
Downham is about 2 miles north of Bromley, in Greater London. Anywhere in BR1, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Downham is one of 764 places we cover in Greater London for mastic packages. Sites around London have their own page, roughly 7 miles from Downham.
We take on mastic packages across the BR1, SE6 and SE12 postcode area. Buildings on Shaw Road, Arcus Road and Brook Lane are within our area. Close to Downham, our area also takes in Plaistow (1 mile south), Grove Park (1 mile north-east), Sundridge (1 mile south-east), Chinbrook (1 mile east) and Bellingham (1 mile west). Further afield, our area takes in London (7 miles north-west), City of Westminster (9 miles north-west), Marylebone (9 miles north-west), Kensington (10 miles north-west), St Pancras (9 miles north-west) and Shoreditch (8 miles north-west).
Local landmarks in Downham
We work on buildings around Holy Trinity College Bromley, Downham Fields and Bonus Pastor Catholic College and the streets around them. The closest station to Downham is Grove Park station, about 0.8 miles north-east of the centre. Well-known places in the area include The Glades (1.6 miles south) and Greenwich Castle (3.6 miles north). For a walk, there’s Summer Hill and Downham Woodland Walk.
Construction mastic for commercial buildings in Downham
On refurbishments, the mastic package normally includes cutting out old sealant as well as sealing new work. Existing joints have to be stripped back to sound faces, because fresh sealant can’t key into cured silicone. After that, the joints are prepared and sealed to the specification. If you have sealant knocked or painted over by other trades and frame perimeters left unsealed or poorly sealed, we can help, on brick and block movement joints, internal decorators’ caulk and sanitary and kitchen joints alike. One point of contact handles commercial sealant work in Downham from the first photographs to the final walk-round, for single jobs and planned programmes alike.
Every London site, Downham included, is inside the ULEZ, which applies to deliveries and contractors’ vans alike. Alongside that, sites typically need booked deliveries and a plan for where materials go.
Work we carry out comes with a 12-month guarantee. If an installation problem shows up, ring 01277 525 020 or email drawings and photos and we’ll arrange a return visit.
- Location
- Downham (BR1, SE6, SE12)
- Wider area
- Greater London
- Cover
- A 12-month guarantee
- Price
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
What the job involves on each surface
Bathrooms, en suites and washrooms
On multi-unit schemes, consistency matters across hundreds of bathrooms. One applicator team gives the same finish everywhere, plot by plot or floor by floor.
Kitchens and utility areas
Worktop upstands, sinks and splashbacks are sealed once the kitchen is fitted. A kitchen-suitable sealant is used and hygienic or food-safe grades wherever food contact is possible.
Nearby places to Downham
Also in Downham
Common questions from Downham clients
Can you work in a London building with booked loading and goods-lift slots?
Yes, most London buildings have access rules of some kind, and we plan around them. Send the building rules and access times with your enquiry. All of Greater London is inside the ULEZ, and our planning allows for it
Could you schedule work at a campus like University of Greenwich - Avery Hill for the vacation?
Yes, holiday working periods are the norm on campus jobs. Let us know which documents your site asks for, and we’ll confirm them alongside the quote.
How do we ask for a quote?
There are four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. The first step only needs photos and a postcode.
Do you work to architects’ specifications?
Yes. The specification and the manufacturer’s installation guidance are what we work to.
Can you work to our specification?
We work to the specification and the manufacturer’s installation guidance. Preparation, backing and depth follow the product guidance.
Can the building stay open while you work?
Yes, with some planning. Tell us your site hours and access windows and we’ll plan around them.
How do you choose the sealant?
If the job is specified, we follow the specification. Otherwise, we recommend a product to suit the joint’s movement, the substrate and the conditions, following the manufacturer’s guidance.
Common problems we fix in Downham
Wide, tapered or inconsistent gaps around frames are a common problem. Sealant has a range of joint widths it can cope with, so gaps outside that range need sorting by the installer first. We flag them early rather than filling them with sealant that won’t last.
Any of the following is a good reason to get the joints checked over:
- Missed perimeter joints on a new elevation
- Existing joints on a refurb that need cutting out and resealing
- A mastic package split between trades with no clear owner
- Sanitary sealant damaged by following trades
Projects at colleges like Hadlow College, 1.5 miles to the north-east of Downham, tend to run to term dates, so the mastic is planned tightly.
What to look for in a quote
- How they handle RAMS and site documents
- How long is the guarantee, and what does it include?
- Health and safety accreditation such as CHAS
- Proof of insurance
When something else is needed
Before quoting, we check that sealant is the right answer. It isn’t the answer for:
- Approving fire stopping as compliant
- Frames fitted out of tolerance
- Defective windows, doors or glazing units (the supplier or installer’s job)
If you’re not sure, just ring 01277 525 020 or email drawings and photos and we will give you a straight answer.
Joints and surfaces we work on
- Floor and skirting junctions
- Cladding and panel joints
- Sanitary and kitchen joints
- Internal decorators’ caulk
- Window and door perimeters
- Brick and block movement joints
How a job runs
Occupied buildings need a little choreography. We sign and contain the area we are in, keep walkways clear and work section by section so the rest of the building stays in use. Planning a London job such as one in Downham starts with access. Give us the hours we can be on site and we will schedule to suit.
- Drawings, specification and programme come to us.
- We take off quantities and return a fixed quote.
- We agree with the site team which areas come first.
- Plots or floors are sealed as they’re handed over.
- Every joint is cleaned, set to depth and sealed with the specified product.
- After snagging, the work is handed over under our 12-month guarantee.
Getting the site ready
- Point out parking and an unloading spot
- Confirm the product named in the specification
- Let building users know which areas are affected
Request a quote
Send us photographs, drawings or a joint schedule are often enough for a fixed quote. Where a site visit makes more sense, we’ll arrange one.
Advice
How the quote is worked out
A fixed quote reflects the actual work. It takes account of:
- Whether old sealant has to be cut out first
- Site requirements such as inductions and permits
- Joint width, depth and condition
- How accessible the joints are
There’s no price list, since every building and every scope is different. Call for a quote and we’ll price your job on its own details.
Details that help us quote
A few photographs plus some basic facts will normally do. Please tell us:
- The asbestos register, for older buildings
- The product your specification calls for
- Where the site is, with the postcode
- Access details, including height
A handful of photographs and a postcode is the fastest way to a quote. Upload them with the quote form, or give us a call on 01277 525 020 or send details through our quote form if you’d rather talk the job through.
What happens if it’s left?
Refurbishments sometimes budget for new windows when the frames are sound and only the seal has failed. Sound frames often need only a new perimeter seal, which is a much smaller cost. We’ll say so if a frame itself is the problem. Getting scaffold, permits or access booked in Downham takes effort, so while access is arranged it pays to renew all failing joints, not just the worst.
Larger quantities, tricky access or phasing all shape the price. So do site requirements such as inductions and permits, along with the time of year for external work.
What you get with us
- One number for every site we cover
- Public liability insurance in place
- Commercial sealant work since 2005
- A Constructionline member, so easy to vet
Take a look at our cost guide and our accreditations and insurance.