Mastic sealant contractors in South Hampstead
Commercial sealant work in South Hampstead for contractors, FMs and building owners: mastic sealing for building owners, managing agents and housing associations, with a fixed quote first.
- Draught complaints from residents or tenants
- A mix of products and colours from past repairs
- Cracked, hardened mastic round windows on a block
Mastic sealing across South Hampstead
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
What affects the price in South Hampstead
To price the job, we consider:
- Any access equipment needed
- Backing rod, priming and other preparation
- The site’s rules and procedures
- The total length or number of joints
A quote for mastic joints depends on how many there are, their condition and the access, and any specification that applies. Call for a quote.
What we need to price the job
For an accurate fixed quote, we need a clear picture of the site. Useful things to include:
- Whether the building will be occupied during the work
- How the joints are reached, and at what height
- Asbestos survey details if the building is older
- The site address and postcode
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to give us a call on 01277 525 020 or use the quote form with what you know.
How we handle mastic sealing in South Hampstead
Treatment starts with a proper look: what has failed, what caused it and whether new sealant will actually solve it. Old mastic is removed entirely, the faces prepared, primer used where the maker specifies it and new sealant tooled in and backing rod used wherever a joint is deep. If you are dealing with brittle perimeter mastic across a building and the same joint failures repeated across a portfolio, we can put it right, on communal entrances and stairwells, external wall and movement joints and window and door perimeters on blocks alike. Most enquiries from South Hampstead start with one failed joint and grow into a wider look at the building: we look at the rest while we are there and tell you what we find.
Across Greater London, South Hampstead 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.
Work we carry out in Greater London comes with a 12-month guarantee. If an installation problem shows up, speak to us on 01277 525 020 or send details through our quote form and we’ll arrange a return visit.
- Location
- South Hampstead (NW3, NW8, NW6)
- Wider area
- Greater London
- Guarantee
- 12 months on our workmanship
- Price
- A fixed quote before we start
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
Blocks and managed buildings in South Hampstead
South Hampstead has three care or nursing homes no more than 2 miles away. Owners of care premises can bring window and door mastic into a phased programme planned around the home. In London, mastic work on a block goes through the managing agent or landlord, with notice to residents. We work to your notice and access plan.
For owners of several units at places like Regis Road Business Park (1.4 miles north-east of South Hampstead), one programme can deal with frame and external mastic across the lot. Trustees of buildings like Church of All Souls can bring frame and external mastic into a planned maintenance list.
South Hampstead is about 1 mile south of Hampstead, in Greater London. Commercial clients in South Hampstead use us for work on mastic joints. Our Greater London coverage takes in 764 places.
Work on mastic joints is covered throughout NW3, NW8 and NW6, for business premises of every kind. Buildings on Avenue Road, Acacia Road and Harben Road are within our area. If your building is just outside South Hampstead, we cover Swiss Cottage (1 mile north), St John's Wood (1 mile south), Haverstock (1 mile east), Belsize Park (1 mile east) and Primrose Hill (1 mile east). Bigger towns within reach include London (4 miles south-east), Kensington (3 miles south-west), St Pancras (3 miles south-east), Shoreditch (4 miles east), Walthamstow (7 miles north-east) and Hoxton (4 miles east).
What’s near South Hampstead
Recent enquiries here include premises near Cafe Med pub, St. Mary's Town and Country School and Holy Trinity CofE Primary School, among other places. Nearby too are Cecil Sharp House (1.1 miles east) and Primrose Hill (0.6 miles east). There’s a railway station in South Hampstead itself: South Hampstead station. A little further out are Isokon Gallery (0.8 miles north-east) and O2 Centre (0.5 miles north-west). Not far away are Adelaide Nature Reserve and The Long Water.
Do you need mastic sealing in South Hampstead?
Previous repairs often sealed new mastic over old. New sealant won’t grip failed sealant and the repair soon fails.
Site and facilities staff are often the first to spot these:
- Damp patches beside frames
- Draughts at frames across a block
- Movement joints with sealant missing
- Communal area joints that look neglected
If your remit includes a building such as The UCL Academy, frame and door mastic can be programmed for the holidays.
Questions to ask before you book
- Whether their applicators hold CSCS cards
- How the existing material will be dealt with
- What level of public liability insurance do they hold?
- Which product they’ll use, and why it suits the joint
When to bring in a specialist
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.
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.
Also near South Hampstead
More services for South Hampstead
What sealant work can’t fix
Before quoting, we check that sealant is the right answer. It isn’t the answer for:
- Leaks from above rather than through a joint
- Asbestos-containing sealant, which we don’t remove
- Leaks through the frame itself rather than the perimeter
Not sure which it is? You can ring 01277 525 020 or email drawings and photos and we will tell you honestly before you book.
Joints and surfaces we work on
- Shopfronts below residential blocks
- Communal entrances and stairwells
- Communal kitchens and washrooms
- Window and door perimeters on blocks
- External wall and movement joints
- Balcony and threshold joints
FAQs: South Hampstead
Do you cover business parks and estates near South Hampstead, such as Regis Road Business Park?
Yes. We cover South Hampstead and the area around it, including industrial estates, business parks and retail parks such as Regis Road Business Park. To start, just call 01277 525 020 or send details through our quote form with the unit, the joints involved and your access times.
Can you work in a care home near South Hampstead with residents in?
Yes. We work around residents’ routines, a room or two at a time. Any site rules, from signing in to infection control, are agreed before we start.
Does weather matter for sealant work?
It can, when the joints are outside. Wet joints and cold, damp or frosty conditions stop the sealant bonding properly, so external work may be moved if conditions aren’t right. Indoors, the weather is rarely a problem.
How much does the work cost?
Every job gets its own fixed quote. To get one, phone 01277 525 020 or send details through our quote form with a description of the work.
Is any job too small?
Single areas, one-off repairs and whole buildings are all quoted the same way: details, then a fixed price, then sealing, then a 12-month guarantee.
Is asbestos a concern with old mastic?
We don’t remove asbestos-containing materials. Anything suspect is tested before we carry on in line with the dutyholder’s asbestos management.
How do I request 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 photos and a postcode.
What the job involves on each surface
External movement joints
The joint width has to suit the movement and the sealant’s capability with the width-to-depth ratio set as the manufacturer advises.
Planned maintenance
Mastic wears out like any building component; how fast comes down to movement, weather, UV and the product. Inspecting joints regularly keeps programmes on track.
Diagnose, treat, sign off
At the end of each section, we remove the tape, clean down and inspect every joint. If an area should be left alone while the sealant cures, we say how long and put signs out. In South Hampstead, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Phased work keeps the rest of the building in use.
- We check the asbestos register for older buildings and look at the joints.
- The products and programme are set out in a fixed quote.
- We strip out the old sealant.
- The joints are prepared and resealed with the right product.
- Buildings are completed in turn.
What we need from you
- Tell us which areas need to stay in use
- Share your working hours and any access restrictions
- Have the specification and drawings to hand
Getting a fixed quote
A handful of photos and a postcode is the fastest way to a quote. Upload them with the quote form, or give us a call on 01277 525 020 or email drawings and photos if you’d rather talk the job through.