Construction Mastic in Foxbury
Sealant work in Foxbury for main contractors, managing agents and facilities managers: mastic packages for new-build and refurbishment projects, with a fixed quote first.
- Missed perimeter joints on a new elevation
- External joints sealed in damp or cold conditions that are now failing
- Bath and shower joints scraped during the final clean
Need construction mastic in Foxbury?
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Our process
Inspect, seal, sign off: every visit follows that pattern. First comes an inspection and agreement on scope, then we prepare and seal each joint with the specified product, and we finish with a walk round so the work can be signed off. Planning a London job such as one in Foxbury starts with access. Send the building rules and access times with your enquiry.
- First we look at the scope on site or from drawings.
- You receive a fixed quote covering scope, products and sequence.
- Paperwork is agreed and applicators are inducted on site.
- We seal plot by plot or floor by floor in line with the programme.
- Any frame gaps or issues outside our scope are flagged to the site team.
- The package is closed out, snags cleared and backed by our 12-month guarantee.
Before we start on site
- Tell us which areas need to stay in use
- Let us know about inductions and permits
- For older buildings, check the asbestos register before work
Ask for a quote
Send us photographs, drawings or a joint schedule and a fixed quote comes back to you. If the job needs a look first, we’ll arrange a site visit.
Related advice
How we handle construction mastic in Foxbury
External mastic depends on the weather in a way most internal trades don’t. Cold or damp mornings, frost and condensation on frames can all hold external sealing up. Internal areas can usually carry on while the outside waits. We work on window and door perimeters, sanitary and kitchen joints and internal decorators’ caulk, and the failures we are asked to look at most are missed perimeter joints on a new elevation and different trades sealing to different standards. Whether you call it commercial sealant work, mastic application or joint sealing, the work in Foxbury is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
The ULEZ covers the whole of Greater London, so contractors’ vehicles on a job in Foxbury must meet its standards or pay the daily charge. Add booked delivery slots and limited storage, and a London mastic package needs planning before the first bead.
Whoever the client is, the cover is the same: a 12-month guarantee on our workmanship. Faults in the structure, damage and other trades’ work fall outside it, and we say so plainly.
- Where
- Foxbury (DA14, BR7, DA15)
- Region
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- A fixed quote before we start
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Foxbury: questions and answers
Can you work around term dates at a campus such as University of Greenwich Avery Hill Campus?
Yes. Tell us the term dates, vacation periods and access windows, and we’ll plan the work around them. Let us know which documents your site asks for, and we’ll confirm them alongside the quote.
Can you take on a job at a hospital such as Queen Mary's Hospital?
Yes. We work in healthcare settings as well as offices and schools. The estates team’s permit system and infection-control rules come first, and the work is planned around them.
Do you do fire-rated sealing on new builds?
Fire-rated sealing at service penetrations and linear gaps can be included where specified. Record requirements are confirmed at quote stage.
Can you clear a mastic snag list before handover?
Yes. Share the list and photos, and a fixed quote follows, with the work timed to your handover date.
Do you seal on top of existing sealant?
No, never. Sealing over old material is one of the classic causes of early joint failure, so everything comes out first.
Are you CHAS accredited?
We are CHAS accredited and a Constructionline member, and our applicators hold CSCS cards. We confirm any paperwork you need with the quote.
Do you work in Foxbury?
Yes. Sites across Foxbury are covered, with one number for every area we cover.
What sets the cost
A fixed quote reflects the actual work. It allows for:
- The product specified
- How accessible the joints are
- Quantities, in metres or numbers
- Phasing around occupants
Quantities, awkward access and phased working all shape the price. Site requirements like inductions and permits play a part as well, along with the time of year for external work.
What we need to price the job
We can often quote from photos and a few details. Please tell us:
- Any specification or named product
- Your programme or deadline
- Drawings or a marked-up plan, if available
- Whether the building will be occupied during the work
A handful of photos and a postcode is the fastest way to a quote. Send them through the quote form, or give us a call on 01277 525 020 or send photos by email to discuss it first.
New build and refits around Foxbury
There are a number of hotels within about 2 miles of Foxbury. When hotels extend or refit, the work is usually squeezed between peak periods, mastic included. As part of Greater London, Foxbury is inside the ULEZ, which applies to every van on site. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for.
Projects at colleges like Bird College (1.2 miles north-east of Foxbury) tend to run to term dates, so the mastic is planned tightly. Extensions at sites like Queen Mary's Hospital, 0.7 miles to the east of Foxbury, typically sit beside working departments, and the mastic follows strict access rules. For contractors on a campus like University of Greenwich Avery Hill Campus, 1.9 miles north of Foxbury, facade and perimeter sealing has to fit around students and term dates.
Foxbury is about 1 mile east of Chislehurst, in Greater London. Looking for construction mastic in Foxbury? We can help, as we do across Greater London. We work across 764 places in Greater London. We also cover London, some 10 miles away.
Business premises anywhere in DA14, BR7 and DA15 are within our area for mastic packages. We cover commercial and managed buildings on Kemnal Road, Sydney Road and Carlton Road. Sites close to Foxbury are covered too, including Longlands (1 mile north), Chislehurst (1 mile west), New Eltham (1 mile north-west), Elmstead (2 miles west) and Coldharbour (2 miles north-west). Bigger towns within reach include London (10 miles north-west), City of Westminster (12 miles north-west), Marylebone (12 miles north-west), Kensington (14 miles north-west), St Pancras (12 miles north-west) and Shoreditch (10 miles north-west).
Near you in Foxbury
We work on buildings around Chislehurst Common, Mead Road Infant School and The Bulls Head Public House, among other places. Foxbury’s nearest station is Sidcup station, about 1.2 miles north-east of the centre. Nearby you will also find The Glades (3.3 miles west) and Queen Mary's Hospital (0.6 miles east). Not far away are Summer Hill and The Tarn.
Honest limits
A proper diagnosis includes knowing what sealant can’t do. You will hear from us if the cause turns out to be any of the following:
- Joint design decisions that belong to the architect or engineer
- Fire-stopping design or sign-off (that’s for the designer, fire engineer and building control)
- Faulty frames rather than failed sealant
Not sure which it is? You can phone 01277 525 020 or email the details over and we will tell you honestly before you book.
Joints and surfaces we work on
- Window and door perimeters
- Sanitary and kitchen joints
- Floor and skirting junctions
- Brick and block movement joints
- Cladding and panel joints
- Internal decorators’ caulk
Maintenance after handover
After handover, a little attention goes a long way:
- Allow flexibility for external sealing in damp or cold weather
- Check frame gaps are within the sealant’s range before sealing
- Share drawings and the specification as soon as possible
- Release areas for mastic once other trades have finished in them
Expect some settlement in the first months. The right product in each joint copes with that while rigid fillers and caulk can crack where movement is larger. We can advise if a joint needs a different product.
One unsealed frame can let water into finished internal areas. On a new building that means remedial work after decorating, and a delay to handover. Checking perimeters before internal finishes go on avoids it.
Also near Foxbury
More services for Foxbury
Work for main contractors and building owners
As a CHAS accredited contractor and Constructionline member, we’re straightforward to vet for your supplier list. Our insurance certificate can be sent along with the quote.
Whether you’re a managing agent, a property factor or an owner’s representative: send details, get a fixed quote, we seal, guaranteed. We can agree access arrangements and keyholder contacts beforehand.
How the job changes by surface
Snagging before handover
The last pass before handover is where mastic snags are cleared. Snags are cleared room by room, cutting out damaged joints and resealing them properly.
Kitchens and utility areas
Kitchen joints are sealed after fitting and before final clean. The sealant is a kitchen-grade product and hygienic or food-safe grades wherever food contact is possible.