Construction and new-build mastic in Lee, Greater London
Construction mastic in Lee, backed by over 20 years in commercial sealing. Fully insured, with a 12-month guarantee.
- Sanitary sealant damaged by following trades
- Perimeter gaps outside the sealant’s range
- Early adhesion failures on new external joints
Construction mastic across Lee
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
From enquiry to sign-off
At the end of each section, the masking comes off, the area is cleaned and every joint is checked with your site contact. If an area should be left alone while the sealant cures, we say how long and put signs out. Most London premises stay occupied while we’re on site, so we agree zones and timings with the building or facilities manager. Areas are handed back as each section is finished.
- Drawings, specification and programme come to us.
- Quantities are measured and a fixed price returned.
- The sequence is agreed with the site manager.
- Each area is sealed when it’s released.
- Joints are prepared, backed and sealed to the specification.
- Snags are cleared and the package signed off with our 12-month guarantee.
What we need from you
- Tell us your opening times and when work is allowed
- Send asbestos survey details if the building is pre-2000
- Point out parking and an unloading spot
Quotes
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price the work to it. For smaller jobs, photos and a description will do.
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About our construction mastic in Lee
Getting a subcontractor through site induction should be simple. Our applicators are CSCS-carded, and we are CHAS accredited and a Constructionline member, with public liability insurance in place. RAMS, an insurance certificate and CSCS details can be confirmed with the quote if you tell us what you need. The enquiries we see most involve old sealant on a refurbishment that needs stripping before new work and snag items on joints that need redoing before handover, across sanitary and kitchen joints, cladding and panel joints and internal decorators’ caulk. Most enquiries from Lee start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.
Around Lee, as across London, much of the work is refurbishing existing buildings as well as building new ones. Replacement windows, recladding and fit-outs leave perimeter and facade joints to seal, often next to people still using the building, so tidy, well-planned work matters.
Whoever the client is, the cover is the same: twelve months on the work we carried out. It doesn’t extend to damage, faults in the building or work by others, and we are upfront about that.
- Where
- Lee (SE12, SE13, SE3)
- Wider area
- Greater London
- Cover
- 12 months on every job
- Price
- A fixed quote before we start
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
After the work
Regular inspection catches problems early. Specifically:
- Ask cleaners to use soft cloths around fresh sealant
- Flag uneven or tapered frame gaps early
- Use the product the specification names
- Release areas for mastic once other trades have finished in them
Any damage after we have finished should go on the snag list straight away. We can return to clear snags before handover, priced as part of the package or separately.
In wet areas, a weak sanitary joint shows up quickly once the building is occupied. Leaks behind showers and basins damage finishes and floors, and the repair falls into the defects period. Proper preparation, with the right silicone first time, keeps it off the defects list.
Site staff or a sealant specialist?
Some joints are best left to specialists: for instance fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. A poor seal in places like these tends to cost more to put right later.
For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class.
Also in Lee
How the job changes by surface
Internal decorators’ caulk
Caulking is often done in a hurry by whoever’s on site. Done properly, it saves decorators time and gives a clean line.
External facade and movement joints
Many facade substrates need a primer before sealing. Primer goes on where the sealant maker calls for it and work only when conditions suit.
For managing agents and facilities managers
Housing associations and managing agents often need work done across blocks and communal areas. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.
FMs need a contractor who is easy to get on site. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we will confirm with the quote.
Facades, frames and programmes in Lee
Every borough of Greater London is inside the ULEZ, and that applies to contractors’ vehicles on any job in Lee. Delivery slots and scarce storage shape how and when the mastic goes in. A 2-mile radius around Lee takes in a good number of hotels. Hotel extensions and refits typically have to fit around bookings, so mastic dates are tight.
For contractors refurbishing units at places like Chiltonian Industrial Estate, under half a mile south of Lee, the mastic covers cladding panels, roller-door and window perimeters. For contractors on a campus like University of Greenwich - Greenwich Campus, 2.2 miles north of Lee, facade and perimeter sealing has to fit around students and term dates.
Lee is about 2 miles south of Greenwich, in Greater London. Commercial clients in Lee can call on us for mastic packages, as part of our coverage of Greater London. We work across 764 places in Greater London. Our London page has more on work in that area.
Commercial sites across SE12, SE13 and SE3 are covered for mastic packages. We cover commercial and managed buildings on Old Road, Manor Lane and Mallet Road. If your building is just outside Lee, we cover Hither Green (1 mile west), Horn Park (1 mile south-east), Lewisham (1 mile north-west), Ladywell (1 mile west) and Blackheath (1 mile north). A short drive away, we cover London (6 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (10 miles west), St Pancras (7 miles north-west) and Shoreditch (6 miles north-west).
Landmarks near Lee
Locally, jobs take us to sites close to Manor House Gardens, Trinity Church of England School and International Academy of Greenwich, among other places. Lee has its own railway station: Lee station. Nearby you’ll also find Lewisham Shopping Centre (1.1 miles north-west) and Prefab Museum (1.3 miles south). Not far away are Summer Hill and Birdbrook Road Nature Reserve.
Questions we’re asked in Lee
Can you cope with the access rules in a London building?
Yes, most London buildings have access rules of some kind, and we plan around them. Say when the building is occupied and when it’s quiet, and we will plan accordingly. All of Greater London is inside the ULEZ, and our planning allows for it
Can work at a site such as University of Greenwich - Greenwich Campus fit around teaching?
Yes. Tell us the term dates, vacation periods and access windows, and we’ll 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 handle several sites?
Yes. We take on portfolio and planned maintenance work, planned site by site to suit how each building is used.
What will the job cost?
There isn’t a price list, as every site differs. Send photographs or drawings and we will price it at a fixed figure.
Is colour matching possible?
It depends on the product. Some ranges offer many colours, others very few, so we’ll confirm the colours available for the specified product with the quote.
Can you seal external joints in wet or cold weather?
External mastic depends on conditions: each sealant has a temperature range, and the joint must be dry. External work is sequenced with some flexibility.
Can you work to our specification?
The specified product is what goes in. If we think an alternative would suit better, we put it to you first.
Common problems we fix in Lee
Swapping the specified sealant for a cheaper general-purpose product is a common cause of failure. 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.
Look out for the following:
- Sealant knocked or painted over by other trades
- Snag items on joints that need redoing before handover
- Oversized or tapered gaps around new frames
- Inconsistent sealant finishes from plot to plot
Hotel extensions and refits, at places such as St Wolframs Hotel, 1 mile north of Lee, typically run between busy periods, so the sealing is squeezed into short windows.
Comparing quotes
- Who will actually carry out the work
- How the joint faces will be prepared and primed
- How they handle RAMS and site documents
- Health and safety accreditation such as CHAS