Construction Mastic in Lewisham
Mastic packages for new-build and refurbishment projects across Lewisham, by CSCS-carded applicators. CHAS accredited and fully insured.
- Bath and shower joints scraped during the final clean
- Failed sealant in an existing building being refurbished
- Oversized or tapered gaps around new frames
Need construction mastic in Lewisham?
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Construction mastic in Lewisham
Perimeter sealing outside needs a dry joint and the right temperature. Each sealant has a temperature range, and damp, frost or condensation on frames stops work so it helps to sequence elevations with some flexibility. Internal sealing often fills those days. If you are dealing with sanitary sealant damaged by following trades and failed sealant in an existing building being refurbished, we can help, on internal decorators’ caulk, floor and skirting junctions and brick and block movement joints alike. Most enquiries from Lewisham 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.
A great deal of London construction is refurbishment of occupied or part-occupied buildings, alongside new blocks. New frames, overcladding and fit-outs all end in perimeter and facade joints, frequently with occupants close by, so tidy, well-planned work matters.
Our 12-month guarantee is about workmanship, not wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we spell out the cover before we begin.
- Place
- Lewisham (SE13, SE8, SE6)
- Wider area
- Greater London
- Cover
- A 12-month guarantee
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
What sealant work can’t fix
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Damage to finishes by other trades after we have sealed
- Oversized gaps that need packing or adjustment by others
- Joint design decisions that belong to the architect or engineer
Not sure which it is? You can speak to us on 01277 525 020 or use the quote form and we will tell you honestly before you book.
What we seal
- Internal decorators’ caulk
- Floor and skirting junctions
- Brick and block movement joints
- Sanitary and kitchen joints
- Window and door perimeters
- Cladding and panel joints
When to bring in a specialist
Using site staff can make sense for a small touch-up, but anything bigger is another matter: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
Redoing a failed joint usually costs more than getting it right at the outset, because the whole bead must be removed and the faces cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.
Building and refurbishing in Lewisham
As part of Greater London, Lewisham is inside the ULEZ, which applies to every van on site. Deliveries are booked and storage is tight, so mastic materials come in as needed. There are a good number of hotels within about 2 miles of Lewisham. Hotel extensions and refits typically have to fit around bookings, so mastic dates are tight.
For contractors on a campus like University of Greenwich - Greenwich Campus, which lies north of Lewisham, facade and perimeter sealing has to fit around students and term dates. Work at a hotel such as St Wolframs Hotel (0.8 miles north-east of Lewisham) tends to be programmed around bookings, mastic included. When a college such as Christ the King Sixth Form College (to the north-east of Lewisham) builds or refurbishes, the mastic package usually has to fit around students and staff.
Lewisham is about 3 miles west of Eltham, in Greater London. We send applicators to Lewisham for mastic packages, handled exactly as we handle every other area. We work across 764 places in Greater London, large and small.
Postcode districts covered here: SE13, SE8 and SE6 for mastic packages. Among the streets we cover are Station Road, Lewisham High Street and Lewis Grove. Main routes into Lewisham include the B220, which helps when planning parking and deliveries for the job. Close to Lewisham, our area also takes in Ladywell (1 mile south-west), St Johns (1 mile north-west), Hither Green (1 mile south-east), Blackheath (1 mile north-east) and Lee (1 mile south-east). Bigger towns within reach include London (4 miles north-west), City of Westminster (7 miles north-west), Marylebone (7 miles north-west), Kensington (9 miles west), St Pancras (6 miles north-west) and Shoreditch (5 miles north-west).
What’s near Lewisham
In Lewisham, that means premises near St Joseph's Academy, Ladywell Fields and The Watch House and the streets around them. Lewisham has its own railway station: Lewisham station. Other landmarks nearby include Greenwich Castle (1.2 miles north) and Fan Museum (1.2 miles north). For a walk, there’s Knight's Hill and Brookmill Road Local Nature Reserve.
Owners, agents and contractors
For main contractors, we work as the sealant subcontractor on new-build and refurbishment projects. We work to your programme, your specification and your site rules, with CSCS-carded applicators on site.
Agents, factors and owners’ representatives all follow the same route: send details, get a fixed quote, we seal, guaranteed. Keys, access and contacts can be agreed in advance.
Keeping the joints sound
Problems stay small when the joints are checked regularly. Specifically:
- Stick to the specified sealant rather than a generic substitute
- Protect sealed areas from following trades
- Record the products used in the O&M file
- Check frame gaps are within the sealant’s range before sealing
After we’ve sealed an area, it helps to keep other trades from damaging the joints. New beads should be left to cure before cleaning or decorating nearby, and that time depends on the product, temperature and joint depth.
Frames with gaps too wide for sealant need sorting before the mastic goes on. Filling a wide gap with sealant alone sets up a failure, so the installer needs to correct it first. We raise them during our first walk of the area.
Your questions answered
Do you work in London buildings with loading restrictions?
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. The ULEZ covers the whole of Greater London, which we allow for
Will you plan work around the academic year at somewhere like University of Greenwich - Greenwich Campus?
Yes. Education sites normally want the work in vacations or in phases during term, and we plan to suit. Any paperwork you need, from RAMS to our insurance certificate and CSCS details, is confirmed with the quote.
What guarantee comes with a mastic package?
Our workmanship carries a 12-month guarantee from sign-off. The guarantee covers our work, not later damage by other trades.
Is Lewisham in your area?
Yes. Lewisham is in our area and the rest of Greater London, within our coverage of Greater London, South East England and Scotland. For a quote, give us a call on 01277 525 020 or email the details over.
Do you need to see the site first?
Photos, drawings or a schedule are often enough to quote. If the job needs a look first, we will arrange a visit before quoting.
Can you follow the specification on our project?
Yes. The specification and the manufacturer’s installation guidance are what we work to, and we raise anything unclear before work begins.
What’s the quickest route to a quote?
There are four steps: send details, receive a fixed quote, we carry out the work, and it’s guaranteed. Step one needs little more than photographs and a postcode.
Why act early in Lewisham
When a package runs over budget, downgrading the product is a common first thought. A failed joint in the defects period costs far more than the product difference. We price the specified product and will tell you plainly where an alternative would or wouldn’t work. Repeat call-outs disrupt occupied London buildings, so a proper job first time, with the old sealant fully removed, is worth it.
What a job costs comes down to how many linear metres there are, how much old material needs removing and the access. Call for a fixed quote once you have the details.
Why choose Mastic Doctor in Lewisham
- 12-month guarantee on workmanship
- Products installed to the manufacturer’s instructions
- Colour options checked against the specified product
- One phone line for London, the South East and Scotland
From enquiry to sign-off
Tell us your site hours and access windows and we’ll plan around them. While we’re working, the area stays contained and tidy, and your contact hears from us before we move to the next area. All of Greater London is in the ULEZ, and kerbside space in Lewisham can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- We walk the site or review drawings to understand the package.
- 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.
- 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.
Before we start on site
- Tell us your opening times and when work is allowed
- Tell us what induction or permit system the site runs
- Move anything stored against the joints
Request a quote
Photos, drawings or a schedule of the joints are often enough for a fixed quote. Where a site visit makes more sense, we’ll arrange one.