Construction and new-build mastic in Greenhill, Greater London
Mastic packages for new-build and refurbishment projects across Greenhill, by CSCS-carded applicators. CHAS accredited and fully insured.
- A long mastic snag list close to completion
- Failed sealant in an existing building being refurbished
- Sealant knocked or painted over by other trades
Construction mastic across Greenhill
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Construction mastic for commercial buildings in Greenhill
We work to the specification and the programme rather than whatever product is to hand. If a product is named, that’s what goes in. Backing, primer and depth follow what the sealant maker sets out. We work on cladding and panel joints, floor and skirting junctions and sanitary and kitchen joints, and the usual reasons a site gets in touch are new external sealant already peeling away and snag items on joints that need redoing before handover. Whether you call it commercial sealant work, mastic application or joint sealing, in Greenhill it comes down to the same thing: the right product in a properly prepared joint.
Building sites in London tend to be tight: small compounds, delivery slots and shared hoists and scaffold. We fit around the programme, sealing each elevation or floor as other trades hand over.
We sign every job off with a 12-month guarantee. The promise is simple: if our work fails within that year, we put it right.
- Location
- Greenhill (NW3, NW6)
- Wider area
- Greater London
- Cover
- 12 months on every job
- Quotes
- Quoted before any work starts
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
How the quote is worked out
To price the job, we consider:
- How much existing material needs removing
- Working within restricted access windows
- How accessible the joints are
- Distance, for remote addresses
The work involved drives the cost: stripping out, preparation, sealing, access and phasing. Call for a quote.
What we need to price the job
There’s no need for a formal survey. These details are enough to start:
- Your programme or deadline
- Whether the building will be occupied during the work
- Rough lengths or quantities, or drawings if you have them
- Where the site is, with the postcode
Every quote starts with the facts: what’s there, how much of it, how we reach it and what’s specified. Send what you have, and we will arrange a site visit if anything is unclear.
Questions about Greenhill
Is a hospital such as Royal Free Hospital somewhere you can work?
Yes. We work in healthcare settings as well as offices and schools. Work is phased so departments keep running, under the site’s own rules.
Is Regis Road Business Park, near Greenhill, within your area?
Yes. We cover Greenhill and the area around it, including industrial estates, business parks and retail parks such as Regis Road Business Park. A few photos and the unit address let us price the work.
What joints do you seal on a new build?
It depends on the specification, but most packages include frame perimeters, sanitary and kitchen joints, caulking where specified and a snagging pass.
Do you guarantee new-build sealant work?
Each package is signed off with a 12-month workmanship guarantee. The guarantee covers our work, not later damage by other trades.
Do you cover Greenhill?
Yes. Greenhill is in our area and the rest of Greater London. To discuss a job, speak to us on 01277 525 020 or send details through our quote form.
What will the job cost?
There isn’t a price list, as every site differs. With photographs or drawings, we can give you a fixed quote.
Can the sealant be colour-matched?
In many cases, yes. Many products come in a range of standard colours, and matching to RAL references or surrounding finishes is often possible. We confirm what’s available for the specified product when we quote.
Building owners, agents and FMs in Greenhill
Hospitality, education, healthcare, office and retail clients come to us directly as well. The work is planned around how the building runs, so guests, pupils, patients or staff are disturbed as little as possible.
Agents, factors and owners’ representatives all follow the same route: send details, get a fixed quote, we seal, guaranteed. We can agree access arrangements and keyholder contacts beforehand.
Facades, frames and programmes in Greenhill
Greenhill has plenty of hotels close by, all within 2 miles. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up. As part of Greater London, Greenhill is inside the ULEZ, which applies to every van on site. Add booked deliveries and tight storage, and the mastic package needs planning with the site team.
Hospital estates such as Royal Free Hospital, under half a mile east of Greenhill, tend to grow and change in phases, often next to occupied wards, so facade and perimeter sealing has to fit the estates team’s plan. When units on a site such as Regis Road Business Park (to the east of Greenhill) are refurbished or reclad, the panel joints and window perimeters are part of the mastic package.
Greenhill is about 1 mile north-east of Hampstead, in Greater London. We cover Greenhill and the rest of Greater London, with the same fixed quotes and 12-month guarantee as everywhere else. Our Greater London coverage takes in 764 places.
Anyone looking for construction mastic in NW3 and NW6 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. For a building on Back Lane, Well Road and Ornan Road or nearby, we can quote for mastic packages. If your building is just outside Greenhill, we cover Hampstead (1 mile south-west), Vale of Health (1 mile north), West Hampstead (1 mile west), Fortune Green (1 mile west) and Haverstock (1 mile south-east). Nearby towns on our patch include London (5 miles south-east), City of Westminster (3 miles south), Marylebone (3 miles south-east), Kensington (4 miles south), St Pancras (3 miles south-east) and Shoreditch (5 miles south-east).
Near you in Greenhill
In Greenhill, that means premises near Cecil Sharp House, Fitzjohn's Primary School and King William IV Public House, among other places. Also close by are South Hampstead High School (0.6 miles south) and Hampstead Heath (0.7 miles north-east). Greenhill has its own railway station: Hampstead Heath station. A little further out are New End Hospital (under half a mile north-west) and Montfichet's Tower (4.3 miles south-east). Not far away are Belsize Wood and Parliament Hill.
Do you need construction mastic in Greenhill?
On a live site, contamination is the biggest threat to a new joint. Plaster dust, release agents, protective film residue and damp all stop sealant bonding, so preparation matters as much here as on a reseal.
Any of the following is a good reason to get the joints checked over:
- New external sealant already peeling away
- Frame perimeters left unsealed or poorly sealed
- Failed sealant in an existing building being refurbished
- Internal caulk splitting as the building dries out
For contractors at a college like Working Men’s College, 1.7 miles east of Greenhill, perimeters and internal sealant are timed for the holidays.
Before you book anyone
- How they’ll work around occupants
- Whether old or failed sealant will be cut out, not overlaid
- Will RAMS and insurance details be available?
- Are they CHAS accredited or on Constructionline?
Diagnose, treat, sign off
Inspect, seal, sign off: that’s the shape of every visit. We inspect the joints and confirm what’s in scope, then we prepare and seal each joint with the specified product, and the job ends with a walk round and sign-off. In Greenhill, most buildings stay in use during the work, so zones and timings are agreed with whoever manages the building. Areas are handed back as each section is finished.
- We walk the site or review drawings to understand the package.
- You receive a fixed quote covering scope, products and sequence.
- Paperwork is agreed and applicators are inducted on site.
- Sealing follows the programme as areas are released.
- Problems we find, such as oversized gaps, are raised right away.
- The package is closed out, snags cleared and backed by our 12-month guarantee.
Before we start on site
- Flag any permit to work we will need
- Send your site hours and access windows
- Share the asbestos register for older buildings
Getting a fixed quote
Send details, get a quote, we seal, guaranteed: that’s how every job runs. The first step is to ring 01277 525 020 or send details through our quote form with what you know.
Advice
What the job involves on each surface
Window and door perimeters
A frame gap that’s too wide can’t just be filled with sealant. We check them during the first walk-round and flag any that need packing or adjusting.
Internal decorators’ caulk
Where the specification calls for it, acrylic decorators’ caulk goes on non-moving internal gaps before painting. It’s paintable and suits gaps that don’t move while moving joints need a flexible sealant.
Towns and villages near Greenhill
Other services in Greenhill
What sealant work can’t fix
We check first that sealant really is the fix. It isn’t the answer for:
- Frames fitted out of tolerance
- Rework caused by others damaging completed areas
- Faulty frames rather than failed sealant
Not sure which it is? You can phone 01277 525 020 or email us and we’ll tell you honestly before you book.
Where we work in Greenhill
- Internal decorators’ caulk
- Sanitary and kitchen joints
- Window and door perimeters
- Brick and block movement joints
- Floor and skirting junctions
- Cladding and panel joints