Southwark mastic sealing
Mastic sealing for Southwark, from a contractor working since 2005. Fully insured and CHAS accredited.
- Old repairs sealed over failed mastic
- Window mastic that has split and shrunk
- Leaks at window and door perimeters
Need mastic sealing in Southwark?
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Mastic sealing in Southwark, done properly
Before work starts, most agents and landlords want the documents in order. For documents, tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we will confirm with the quote. We are CHAS accredited and a Constructionline member, with public liability insurance. We work on shopfronts below residential blocks, balcony and threshold joints and communal entrances and stairwells, and the failures we are asked to look at most are open joints in brickwork or panels and the same joint failures repeated across a portfolio. For commercial sealant work in Southwark, you deal with one contact from quote to sign-off, whether it’s one building or several.
Across Greater London, Southwark included, the ULEZ applies, and parking and loading rules differ from street to street. For block-wide work, a place to park and store materials saves time on every visit.
Our workmanship is guaranteed for 12 months, in Southwark as everywhere else we work. If our installation lets you down in that time, we return and fix it.
- Location
- Southwark (SE1, SE11)
- Wider area
- Greater London
- Cover
- 12 months on every job
- Quote
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Last updated
- 3 November 2026
Keeping the joints sound
For the best life from the joints:
- Prioritise elevations facing the weather
- Group repairs into a planned programme
- Include mastic in your cyclical inspections
- List the paperwork your organisation requires when you send details
Where a paintable product was specified, it can be painted after curing. Non-paintable silicone shouldn’t be painted over unless told otherwise.
One failed perimeter normally means others on the same building are close so a single failure is a sign to check the rest. Doing them together saves going back again and again.
Cost factors for mastic joints
Sealant work doesn’t have a standard rate, because every site is different. What we look at:
- The size and state of each joint
- Location, for remote and island sites
- The total length or number of joints
- Working within restricted access windows
No two sites price the same: joint size, product, access and site hours all play a part. A fixed quote follows once we understand the job.
What we need to price the job
To price the job accurately, we need to understand the site. Useful things to include:
- How the joints are reached, and at what height
- Asbestos survey details if the building is older
- Clear photos of the problem areas
- Any specification or named product
We quote a fixed sum against the scope you give us, so you know the figure before anyone is on site. To start the process, speak to us on 01277 525 020 or use the quote form.
Why act early in Southwark
Dealing with failed joints one report at a time is slow and scattered. A planned programme treats each building once, under a single quote and a single programme. 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 how the joints are reached. Call for a fixed quote once you have the details.
Why choose Mastic Doctor in Southwark
- One phone line for London, the South East and Scotland
- Coloured sealants to suit the setting, where available
- Matching to RAL references, product permitting
- Sealing commercial buildings since 2005
Take a look at what affects the cost and how we’re accredited.
Doing it in-house
Redoing a failed joint typically costs more than getting it right at the outset, because the whole bead must be removed and the faces cleaned back again. That’s why many clients bring in a specialist from the beginning.
For most general trades, sealant is a sideline. A specialist prepares properly, controls joint depth and picks a product with the right movement class.
When it isn’t the sealant
Some faults sit outside our scope, and we point that out rather than sealing over them:
- Glazing that needs replacing
- Frames that are rotten, warped or broken
- Materials that need asbestos testing before work
Not sure which it is? You can call the office on 01277 525 020 or send photos by email and we will tell you honestly before you book.
What we seal
- Shopfronts below residential blocks
- Balcony and threshold joints
- Window and door perimeters on blocks
- Communal kitchens and washrooms
- Communal entrances and stairwells
- External wall and movement joints
Also near Southwark
What else we do in Southwark
FAQs: Southwark
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. We allow for the ULEZ, which covers every borough
Can work in a care setting near Southwark go ahead while residents are there?
Yes. We work around residents’ routines, a room or two at a time. Noise and disruption are kept to a minimum.
Is any job too small?
Small jobs are welcome alongside larger packages. Send details for a fixed quote.
Can you plan resealing across several buildings?
We can. Each building is inspected, quoted and scheduled in turn starting wherever is most urgent.
How many days will you need on site?
That varies with the scale of the job, but the work normally takes one or more days per building, depending on the joint lengths and the access. For bigger or phased jobs, we’ll set out a timescale with the quote.
Will you come and look before quoting?
Many jobs can be quoted from photographs, drawings or a joint schedule. If the job needs a look first, we will arrange a visit.
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.
Mastic sealing around Southwark: points for this area
The 2 miles around Southwark include two care or nursing homes. For owners and operators of care buildings, window perimeters and external joints are best renewed in planned phases around residents. London blocks come with residents to inform, access to agree and often a concierge or estate office to work with. We work to your notice and access plan.
If you look after a block within reach of Elephant & Castle station, 0.5 miles south of Southwark, frame and balcony mastic can be renewed on one programme. For owners of several units at places like Southwark Bridge Business Centre, less than half a mile to the north of Southwark, one programme can deal with frame and external mastic across the lot. Student blocks close to universities like London South Bank University (less than half a mile south-west of Southwark) are easiest to work on between tenancies.
Southwark is about 0 miles north-west of London, in Greater London. Our applicators travel to Southwark for work on mastic joints, handled exactly as we handle every other area. 764 places across Greater London fall within our area, Southwark among them.
We take on mastic joints across the SE1 and SE11 postcode area, for business premises of every kind. We cover commercial and managed buildings on Borough Square, Trinity Church Square and Merrick Square. You’ll find Southwark on or near the A300 and B240, so getting applicators and materials to site is simple. If your building is just outside Southwark, we cover Tower Hill (1 mile north-east), City of London (1 mile north), Aldgate (1 mile north-east), Bishopsgate (1 mile north-east) and Barbican Estate (1 mile north). Nearby towns on our patch include City of Westminster (3 miles west), Kensington (5 miles west), Walthamstow (7 miles north-east), Hampstead (5 miles north-west), Ruislip (14 miles west) and Brompton (3 miles west).
What’s near Southwark
Recent enquiries here include premises near London School of Musical Theatre, Little Dorrit's Playground and St Mary-at-Hill and the streets around them. You will also find Ark Globe Academy (less than half a mile south-east), The BFI Reuben Library (0.9 miles north-west) and The Gladstone Arms (less than half a mile north-east). For rail, the closest station is Elephant & Castle station, about 0.5 miles south. Nearby you’ll also find Gabriel's Wharf (0.7 miles north-west) and Baynard's Castle (0.8 miles north). Open spaces near Southwark include Ludgate Hill and Bellenden Road Nature Garden.
Diagnose, treat, sign off
Diagnose, treat, sign off: that’s the shape of every visit. We inspect the joints and confirm what’s in scope, then the work is carried out to the specified product and detail, and we finish with a walk round so the work can be signed off. The ULEZ covers the whole of Greater London, and parking near a job is rarely simple. If there’s a loading bay, a car park or a permit we can use, tell us when you send details.
- First comes a look at the joints and, for older buildings, the asbestos records.
- A fixed quote covers the joints, products and order of work.
- Failed mastic is removed completely.
- Joint faces are cleaned, backed and resealed.
- Buildings are completed in turn.
What we need from you
- Let building users know which areas are affected
- Make sure the joints can be reached
- Flag any permit to work we’ll need
Ask for a quote
For a fixed quote, give us a call on 01277 525 020 or email drawings and photos. Our quote form is another easy route.