West Hampstead mastic sealing
Mastic sealing for building owners, managing agents and housing associations throughout West Hampstead and nearby, carried out by CSCS-carded applicators. CHAS accredited and fully insured.
- Leaks at window and door perimeters
- A mix of products and colours from past repairs
- Cracked, hardened mastic round windows on a block
Mastic sealing in West Hampstead
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
When to call us in West Hampstead
Frames, panels and masonry expand and contract through the year, and the sealant takes up that movement. A joint that was too narrow, too thin or the wrong product can’t cope long before it should.
Most enquiries start with something like this:
- No planned programme for sealant
- Damp patches beside frames
- The same joint failures repeated across a portfolio
- Cracked, hardened mastic round windows on a block
If you own or manage units on a site such as The Quadrant Business Centre, which lies south-west of West Hampstead, failed mastic on frames, door surrounds and external joints can be dealt with unit by unit.
Before you book anyone
- Whether old or failed sealant will be cut out, not overlaid
- Will CSCS-carded applicators be on site?
- Their pre-qualification and accreditations
- What the guarantee covers, and for how long
About our mastic sealing in West Hampstead
Treatment starts with a proper look: which joints have failed, why, and whether sealant is the right answer. Old mastic is removed entirely, the faces prepared, primer used where the maker specifies it and new sealant tooled in, with backing rod setting the depth where it’s needed. If you have water getting in round frames after rain and brittle perimeter mastic across a building, we can put it right. Looking for mastic applicators who cover West Hampstead? We’ve been sealing commercial buildings since 2005, CHAS accredited and a Constructionline member.
Across Greater London, West Hampstead included, the ULEZ applies, and parking and loading rules differ from street to street. For a block or estate, it helps to know where we can park and stage materials.
Every job ends the same way: guaranteed. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.
- Location
- West Hampstead (NW3, NW6, NW2)
- Region
- Greater London
- Cover
- 12 months on every job
- Quotes
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Updated
- 3 November 2026
What affects the price in West Hampstead
A fixed quote reflects the actual work. It takes account of:
- Access and working height
- Location, for remote and island sites
- Quantities, in metres or numbers
- Joint width, depth and condition
Whether it’s a single area or a whole estate, the same things set the price: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote, and you will have a fixed figure to work with.
What we need to price the job
A good diagnosis starts with the right details. Let us know:
- A wide shot and a close-up of the area
- What the building is and how it’s used
- The site address and postcode
- Any dates the work must fit around
For a fixed quote, call 01277 525 020 or email a schedule or drawings with the site address and an outline of the work. You can also send details through our quote form.
Should maintenance staff do it?
General builders and handymen seal joints, but it isn’t their main trade. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint.
Some joints are best left to specialists: for instance fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. Getting these wrong typically costs more in the end than doing them right.
Diagnose, treat, sign off
We bring the products specified for the job, along with primers and backing rod. Any old material is cut back to clean, sound faces, primer goes on where the manufacturer specifies it, and each bead is tooled to a neat concave finish. 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.
- Each block or building is walked and the failed joints recorded with the likely cause.
- We send a fixed quote that sets out the joints, the products and the programme.
- Dates, areas and access are agreed so residents or tenants can be told in advance.
- Old sealant is stripped and each face prepared back to firm material.
- Backing rod and primer go in where the joint and the product need them, then new sealant is applied and tooled.
- Finished joints are looked over and the 12-month guarantee confirmed.
What we need from you
- Tell us which areas need to stay in use
- Tell staff and tenants when we will be in
- Share the asbestos register for older buildings
Ask for a 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.
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Also near West Hampstead
Also in West Hampstead
Frames, entrances and external joints in West Hampstead
For a London block, the agent or landlord typically handles notices to residents and access to flats. We plan around the notices and access you arrange. Four care or nursing homes sit less than 2 miles from West Hampstead. Frame mastic on care buildings is best renewed elevation by elevation, with the manager deciding timings.
For agents with blocks near Finchley Road & Frognal station, which lies south-east of West Hampstead, a block-wide mastic programme deals with frames, balconies and entrances in one go. Trustees of buildings like Presbyterian Church Of St Andrew can bring frame and external mastic into a planned maintenance list.
West Hampstead is about 3 miles north-west of City of Westminster, in Greater London. We cover West Hampstead and the rest of Greater London, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. Our Greater London coverage takes in 764 places. Sites around London have their own page, roughly 6 miles from West Hampstead.
Commercial sites across NW3, NW6 and NW2 are covered for mastic joints. For a building on Mill Lane, Acol Road and Ajax Road or nearby, send details and we will quote for mastic joints. Being close to the A502, West Hampstead is straightforward for us to reach. We also cover Fortune Green (1 mile west), Hampstead (1 mile east), Greenhill (1 mile east), Childs Hill (1 mile north-west) and Vale of Health (1 mile north-east). Further afield, our area takes in London (6 miles south-east), City of Westminster (3 miles south-east), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (5 miles east).
Landmarks near West Hampstead
Recent enquiries here include premises near South Hampstead High School, Holly Bush pub and Kilburn Grange Park, among other places. There’s a railway station in West Hampstead itself: Finchley Road & Frognal station. A little further out are Isokon Gallery (1.2 miles east) and New End Hospital (0.5 miles north-east). For a walk, there’s Parliament Hill and Westbere Copse.
Questions about West Hampstead
Can you work in a London building with booked loading and goods-lift slots?
Yes. Inductions, permits and timed loading are routine for us in London. Share the building’s contractor rules and we’ll work to them.
We manage a building near Finchley Road & Frognal station. Can you help?
Yes. Blocks of any size are within what we do. Photos of each elevation help us quote accurately.
What paperwork can you provide?
We’re CHAS accredited, a Constructionline member and carry public liability insurance. For specific documents, tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote.
Can weather delay the job?
For external joints, yes. The joint has to be dry and within the product’s temperature range, so damp, frosty or very cold days can stop external work. Inside work is seldom held up.
Can you seal joints high up on a block?
It depends on the building. How upper joints are reached is agreed before work is booked so the fixed quote reflects it.
Will residents or tenants be disturbed?
Residents and tenants carry on as normal. We flag any areas that need internal access well before the dates so it can be arranged.
How soon can the area be used again?
That comes down to the sealant and the temperature. Some products skin over quickly but need longer to cure fully, and we confirm it before leaving site.
How the job changes by surface
Commercial and mixed-use buildings
Tenants in commercial buildings need to keep trading so the work is phased.
Planned maintenance
Adding mastic to planned maintenance avoids reactive repairs and keeps budgets predictable.
When it isn’t the sealant
We check first that sealant really is the fix. It isn’t the answer for:
- Frames that are rotten, warped or broken
- Cracked or crumbling render, brick or stone at the joint edges (we will tell you if so)
- Materials that need asbestos testing before work
Not sure which it is? You can call the office on 01277 525 020 or email a schedule or drawings and we will tell you honestly before you book.
Surfaces we seal
- Communal kitchens and washrooms
- Window and door perimeters on blocks
- Shopfronts below residential blocks
- External wall and movement joints
- Communal entrances and stairwells
- Balcony and threshold joints