Mastic sealing for building owners and managing agents in Bexley, Greater London
We carry out mastic sealing for building owners, managing agents and housing associations in Bexley. Send details for a fixed quote.
- Mastic failing across several blocks on an estate
- Brittle perimeter mastic across a building
- Complaints coming in block by block
Mastic sealing near Bexley
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Honest limits
Some faults sit outside our scope, and we point that out rather than sealing over them:
- Water coming in from the roof or rainwater goods
- Cracked or crumbling render, brick or stone at the joint edges (we will tell you if so)
- Glazing that needs replacing
If you’re not sure, just give us a call on 01277 525 020 or send details through our quote form and we’ll give you a straight answer.
Joints and surfaces we work on
- Communal kitchens and washrooms
- Communal entrances and stairwells
- Shopfronts below residential blocks
- External wall and movement joints
- Window and door perimeters on blocks
- Balcony and threshold joints
Mastic sealing for commercial buildings in Bexley
Different joints need different sealants. Low-modulus neutral-cure silicone suits many window perimeters and external movement joints, while hybrid polymer sealants grip many materials and are often paintable. We will confirm the colours available for the specified product. The enquiries we see most involve repeated reactive repairs to the same buildings and damp patches beside frames, across shopfronts below residential blocks, communal kitchens and washrooms and window and door perimeters on blocks. Whether you call it commercial sealant work, mastic application or joint sealing, in Bexley it comes down to the same thing: failed joints cut out, faces prepared and the right sealant laid to the right depth.
Planning mastic work on a London block means notices to residents, access to flats and agreed working areas. We work to the agent’s notice and access plan, so residents know what’s happening.
Our workmanship is guaranteed for 12 months, wherever the site is. If a joint we sealed fails because of how it was installed, we come back and put it right.
- Place
- Bexley (DA5, DA6, DA14, DA1)
- Region
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
Towns and villages near Bexley
Other services in Bexley
Commercial clients in Bexley
We take on planned maintenance as well as one-off repairs: resealing failed joints building by building, on a schedule that suits your budget. Sites in Bexley can sit alongside others in a wider programme.
We work for building owners and managing agents on sealant work across single buildings or whole portfolios. Several sites can go on one quote, which keeps the paperwork simple.
Surface by surface
External movement joints
Joint size and product are matched to the expected movement, often around 2:1 width to depth, as the manufacturer advises.
Commercial and mixed-use buildings
Mixed-use buildings combine shops below with flats or offices above, so phasing has to suit both. We plan around the site hours and access windows you give us.
On site: what to expect
Inspect, seal, sign off: that’s the shape of every visit. First comes an inspection and agreement on scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. In Bexley, most buildings stay in use during the work, so zones and timings are agreed with whoever manages the building. Phased work keeps the rest of the building in use.
- First comes a look at the joints and, for older buildings, the asbestos records.
- The products and programme are set out in a fixed quote.
- Failed mastic is removed completely.
- The joints are prepared and resealed with the right product.
- We finish each building before moving to the next.
What we need from you
- Flag any permit to work we’ll need
- Share the asbestos register for older buildings
- Have the specification and drawings to hand
Getting a fixed quote
A good quote starts with a clear picture: the joints involved, quantities, access and the product called for. Share whatever details you have and we’ll fill any gaps with a visit.
Advice
Looking after buildings in and around Bexley
Bexley has seven care or nursing homes no more than 2 miles away. Care home owners need frame and external mastic kept sound without unsettling residents. London blocks come with residents to inform, access to agree and often a concierge or estate office to work with. Our programme follows the access you agree with residents.
Student accommodation around universities such as University of Greenwich Avery Hill Campus (to the west of Bexley) is typically managed block by block, which suits a planned mastic programme. For owners of several units at places like Old Bexley Business Park, 0.7 miles to the east of Bexley, one programme can deal with frame and external mastic across the lot. For agents with blocks near Bexley station (0.6 miles east of Bexley), a block-wide mastic programme deals with frames, balconies and entrances in one go.
Bexley is about 3 miles east of Eltham, in Greater London. Businesses, contractors and managing agents in Bexley can call on us for mastic joints, as part of our coverage of Greater London. Across Greater London, 764 places are covered, including Bexley. For work in that direction, see our London page (11 miles or so).
Work on mastic joints is covered throughout DA5, DA6, DA14 and DA1. If your site is on Bexley High Street, Camden Road and The North Glade or close by, send details and we’ll quote for mastic joints. With the A2018 and B2210 nearby, Bexley is straightforward for us to reach. Close to Bexley, our area also takes in Blendon (1 mile north-west), North Cray (1 mile south), Bexleyheath (1 mile north), Upton (1 mile north) and Coldblow (1 mile east). A short drive away, we cover London (11 miles west), City of Westminster (13 miles west), Marylebone (13 miles north-west), Kensington (15 miles west), St Pancras (12 miles north-west) and Shoreditch (11 miles north-west).
Around Bexley
We work on buildings around St Columba's Catholic Boys' School, Danson Park and Townley Grammar School and the streets around them. Bexley’s nearest station is Bexley station, about 0.6 miles east. Well-known places in the area include Broadway Shopping Centre (1 mile north-east) and Bexley Museum (1.1 miles east). Open spaces near Bexley include Summer Hill and Wansunt Pit.
Common questions from Bexley clients
Will you work in a care home in Bexley without moving residents out?
Yes. We work around residents’ routines, a room or two at a time. We follow the home’s own procedures throughout.
Will you take on a block within reach of Bexley station?
Yes. Blocks of any size are within what we do. Give us the building’s details and say how residents are notified, and we will quote and plan to suit.
What about access for upper-floor joints?
Every block is different. We agree access with you at quote stage so the fixed quote reflects it.
Is mastic sealing guaranteed?
Every building we reseal has a 12-month guarantee. It applies to our workmanship rather than damage or problems with the frames.
How long does a typical visit take?
We plan the time on site around your programme and access. We’ll give you an estimate of time on site when we quote.
Does weather matter for sealant work?
It can, for external work. Sealant won’t bond properly to a wet or frosty joint, so we watch the forecast and rearrange outside work if we have to. Internal work is far less affected.
What if the old mastic contains asbestos?
Asbestos removal isn’t part of our work. If old sealant is suspected, work stops until it’s tested, and the duty to manage asbestos sits with the dutyholder.
Leave it or put it right?
Leaving failed external joints lets water reach the structure behind. Damp patches, stained plaster and decorating claims can follow and those cost far more to put right. Repeat call-outs disrupt occupied London buildings, so cutting the old sealant out fully and doing it right once is the better route.
The work involved drives the cost: removing old material, preparing the joints, the product, the access and how the work is phased. Call for a quote.
What you get with us
- A range of standard colours, depending on the product
- CHAS accredited contractor
- Work to your specification and the manufacturer’s guidance
- Constructionline member
Read how commercial sealant jobs are priced or our accreditations.
Doing it in-house
For a quick touch-up, site staff may be fine, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
What you see is the finished bead, but most of the work is hidden. Backing rod, primer where specified and a joint designed to move with the building are where general trades tend to cut corners.