Expansion joint sealing in St John's Wood
Planning work on a movement joint in St John's Wood? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Weathered movement joint sealant that no longer flexes
- Movement joints with split or torn sealant
- Joints where the bead has lost adhesion
Expansion joint sealing across St John's Wood
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
About our expansion joint sealing in St John's Wood
Mastic Doctor has sealed movement joints since 2005. Our applicators are CSCS-carded, we are CHAS accredited and a Constructionline member, and we carry five million pounds of public liability insurance. Each job is backed by a 12-month guarantee on the workmanship. Most enquiries involve movement joints with split or torn sealant and new sealant over old, now failing, on car park decks and ramps, cladding panel joints and precast concrete panel joints. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in St John's Wood, preparation and product choice get the time they need.
Most London buildings can’t shut a car park, loading bay or warehouse floor for long. Joints are done in sections, with bays coned off one after another, so the site keeps operating.
We stand behind the joints we seal: 12 months, guaranteed. It covers how we prepared and applied the sealant, and if something we did falls short, we return to it.
- Where
- St John's Wood (NW8, NW6, NW3)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Quotes
- A fixed quote before we start
- Telephone
- 01277 525 020
- Updated
- 3 November 2026
Diagnose, treat, sign off
At the end of each section, we remove the tape, clean down and inspect every joint. Where the sealant needs time to cure before use, we tell you and sign the area. All of Greater London is in the ULEZ, and kerbside space in St John's Wood can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.
- First the joints are inspected, widths measured and the type of failure noted.
- A fixed quote names the sealant we propose and its movement class.
- Where areas have to stay open, we agree a phased sequence before starting.
- The failed seal is cut out and both joint faces cleaned back to sound material.
- Backing rod or bond-breaker sets the depth, primer goes on where specified, and the sealant is applied and tooled.
- Finished joints are inspected, the cure time confirmed and the 12-month guarantee applies.
What we need from you
- Share your working hours and any access restrictions
- Send any specification or drawings in advance
- Tell us what induction or permit system the site runs
Request a quote
For a fixed quote, call the office on 01277 525 020 or email the details over. You can also send details through our quote form.
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What the job involves on each surface
Joints between different materials
Hybrid or MS polymer sealants bond to many substrates. We pick the product for the materials and the movement, and confirm it in the quote.
Brickwork and blockwork joints
A brick movement joint full of old mortar or debris can’t close. Everything is raked out before backing and sealant go in.
What we can’t put right
Not every problem is a sealant problem, and we are upfront when that’s the case. It won’t fix:
- Leaks coming from the membrane rather than the joint seal
- A joint that has to be widened or re-detailed before it can work
- Movement on a scale no sealant is meant to absorb
If in doubt, ring 01277 525 020 or email us and we will say what we think.
Where we work in St John's Wood
- Precast concrete panel joints
- Podiums and floor movement joints
- Blockwork control joints
- Cladding panel joints
- Car park decks and ramps
- Brickwork movement joints
Why it’s worth doing now in St John's Wood
Doing joint resealing alongside other planned works can save on access. Leaking joints need sealing now, as damage continues meanwhile. Urgent joints now, the rest later, is often the sensible plan. Getting scaffold, permits or access booked in St John's Wood takes effort, so while access is arranged it pays to renew all failing joints, not just the worst.
Quantities, awkward access and phased working all shape the price. So do site requirements such as inductions and permits.
Why clients in St John's Wood choose us
- One number for every site we cover
- Over 20 years of commercial sealing
- Products installed to the manufacturer’s instructions
- Standard and matched colours in many product ranges
FAQs: St John's Wood
Can you work on a hospital site such as Hospital of St John and St Elizabeth?
Yes, hospitals are one of the sectors we cover. Each area is agreed with the ward or department and the estates team in advance.
Will you take on work at estates like The Quadrant Business Centre, close to St John's Wood?
Yes. Our area takes in St John's Wood and its surroundings, with estates and business parks such as The Quadrant Business Centre included. A few photos and the unit address let us price the work.
Do you work in St John's Wood?
Yes. We take on work across St John's Wood, with one number for every area we cover.
What will the job cost?
It depends on the job: the volume of work, the access, the specified product and how it’s phased. Call for a quote.
Will you just go over the old sealant?
No, never. Overlaying old sealant is a frequent cause of early failure, so it all comes out first.
What exactly is a movement joint?
The terms overlap a great deal. Both let materials grow and shrink with temperature, moisture and load, and the seal across it keeps water and debris out.
How soon can the area be used again?
That comes down to the sealant and the temperature. Some take light use quickly, others need longer to cure, so we will confirm the curing time on the day.
Should maintenance staff do it?
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.
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.
Also near St John's Wood
Other services in St John's Wood
Traffic, movement and joints around St John's Wood
London car parks, loading bays and podium decks often can’t close for long, so the work is broken into short sections agreed with the building manager. At least three named trading, business or retail sites lie within about 3 miles of St John's Wood. Floors, loading bays and yards on sites like these are where floor and movement joints work hardest.
At a retail site such as O2 Centre (0.9 miles north of St John's Wood), trolleys, cages and cars run over floor and slab joints all day. On a site such as The Quadrant Business Centre, 1.4 miles west of St John's Wood, the movement joints are in car park slabs, paving and building elevations. At places like Regis Road Business Park, which lies north-east of St John's Wood, joints are sealed a section at a time so operations carry on.
St John's Wood is about 1 mile south of Hampstead, in Greater London. We cover commercial sites throughout St John's Wood, whether it’s a single job or part of a planned programme. We work across 764 places in Greater London.
Commercial sites across NW8, NW6 and NW3 are covered for movement joints. We cover commercial and managed buildings on The Lane, Hall Road and Hill Road and the roads nearby. St John's Wood sits on or close to the A5205, which helps when planning parking and deliveries for the job. Close to St John's Wood, our area also takes in South Hampstead (1 mile north), Swiss Cottage (1 mile north), Primrose Hill (1 mile north-east), Lisson Grove (1 mile south) and Haverstock (1 mile north-east). A short drive away, we cover London (4 miles south-east), Kensington (3 miles south-west), St Pancras (3 miles east), Shoreditch (4 miles east), Walthamstow (7 miles north-east) and Hoxton (4 miles east).
Around St John's Wood
In St John's Wood, that means premises near Cecil Sharp House, Primrose Hill and Arnold House School, among other places. Nearby too are Quintin Kynaston Community Academy (under half a mile north-west) and Cafe Med pub (under half a mile north-west). St John's Wood has its own railway station: South Hampstead station. Well-known places in the area include Hospital of St John and St Elizabeth (under half a mile south) and Montfichet's Tower (3.5 miles south-east). Open spaces near St John's Wood include The Long Water and Primrose Hill.
Commercial clients in St John's Wood
Whether you are a managing agent, a property factor or an owner’s representative: send details, get a fixed quote, we seal, guaranteed. Keys, access and contacts can be agreed in advance.
Facilities managers want contractors who arrive with the paperwork sorted. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we’ll confirm them with the quote.