Construction Mastic in Childs Hill
Sealant work in Childs Hill for main contractors, managing agents and facilities managers: mastic packages for new-build and refurbishment projects, with a fixed quote first.
- Frame gaps too wide for sealant alone
- Frame perimeters left unsealed or poorly sealed
- Cracks opening in caulked internal joints
Construction mastic in Childs Hill
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Why deal with it now?
A quick bead over a damaged joint can get an area past inspection, but it won’t last. Sealant can’t grip a contaminated or existing bead. We cut out and redo the joint properly. Access in London is hard enough to arrange once, so while access is arranged it pays to renew all failing joints, not just the worst.
Access can matter as much as the joints themselves: easy-to-reach joints are quicker than those that need equipment to get to. Tell us how the joints are reached and call for a quote.
Why appoint us
- Matching to RAL references, product permitting
- One phone line for London, the South East and Scotland
- Colour options checked against the specified product
- Fully insured, including public liability cover
Read our cost guide and our accreditations.
How we handle construction mastic in Childs Hill
Refurbishment work needs a slightly different approach from new build. Old beads come out completely, as fresh silicone can’t grip old, and on older buildings we ask for the asbestos survey before disturbing anything. After that, the joints are prepared and sealed to the specification. Site teams most often ask us about missed perimeter joints on a new elevation and internal caulk splitting as the building dries out, across floor and skirting junctions, cladding and panel joints and brick and block movement joints. Most enquiries from Childs Hill start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.
Around Childs Hill, as across London, much of the work is refurbishing existing buildings as well as building new ones. New frames, overcladding and fit-outs all end in perimeter and facade joints, frequently with occupants close by.
What our 12-month guarantee covers is the way we did the job: preparation, application and finish. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.
- Where
- Childs Hill (NW2, NW3, NW11)
- Wider area
- Greater London
- Guarantee
- 12 months on every job
- Quotes
- Quoted before any work starts
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Work for main contractors and building owners
Hotels, schools, healthcare sites, offices and retail units book us directly too. The work is planned around how the building runs, so guests, pupils, patients or staff are disturbed as little as possible.
We work for building owners and managing agents on sealant work across single buildings or whole portfolios. One quote can cover more than one site, so there’s one set of paperwork to deal with.
Doing it in-house
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.
Putting right a botched joint often costs more than sealing it well at the start, since all of it has to come out and the faces be cleaned back again. That’s why many clients bring in a specialist from the beginning.
When something else is needed
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Joints damaged after sign-off by following trades
- Approving fire stopping as compliant
- Joint design decisions that belong to the architect or engineer
Not sure which it is? You can speak to us on 01277 525 020 or email a schedule or drawings and we’ll tell you honestly.
Where we work in Childs Hill
- Internal decorators’ caulk
- Sanitary and kitchen joints
- Brick and block movement joints
- Cladding and panel joints
- Window and door perimeters
- Floor and skirting junctions
On site: what to expect
Where the site stays busy, we agree a sequence with your contact so the disruption stays in one area at once. Each area is protected, prepared and sealed, then reopened once the sealant allows before the next one starts. In Childs Hill, most buildings stay in use during the work, so we agree zones and timings with the building or facilities manager. Areas are handed back as each section is finished.
- Drawings, the sealant specification and your programme come to us for pricing.
- A fixed quote sets out the scope, the products and the sequence.
- Any site paperwork you need (RAMS, insurance certificate, CSCS details) is confirmed with the quote.
- We seal each plot or floor as it’s released to us.
- Each joint is prepared, backed to depth and sealed in the product the specification names.
- Snags are cleared before handover and completed areas carry our 12-month guarantee.
Before we start on site
- Share your working hours and any access restrictions
- Move anything stored against the joints
- Let building users know which areas are affected
Getting a fixed quote
Send us photographs, drawings or a joint schedule and a fixed quote comes back to you. Where a site visit makes more sense, we’ll arrange one.
Read more
How the job changes by surface
Internal decorators’ caulk
Caulk is easy to apply badly. A neat, consistent caulk line makes the decorators’ job quicker.
Window and door perimeters
Perimeter joints between frames and the structure are the weather line on any new building. We use the specified perimeter sealant, normally a low-modulus neutral-cure silicone and set the depth with backing where needed.
Contractors’ notes for Childs Hill
Site traffic in Childs Hill falls within London’s ULEZ, like everywhere else in Greater London. London sites also mean booked deliveries and limited storage, which the mastic programme has to allow for. The area within 2 miles of Childs Hill holds plenty of hotels. Hotel refurbishments often run to tight programmes between busy periods, and perimeter and sanitary sealant has to keep up.
When a college such as College of North West London (2.2 miles west of Childs Hill) builds or refurbishes, the mastic package usually has to fit around students and staff. Extensions at sites like Royal Free Hospital (1.5 miles south-east of Childs Hill) usually sit beside working departments, and the mastic follows strict access rules. On a campus such as Middlesex University, 3 miles to the north-west of Childs Hill, new teaching buildings and residences are usually built and refurbished around the academic year.
Childs Hill is about 1 mile north-west of West Hampstead, in Greater London. Across the NW2 postcode area, it works the same way: send details, get a fixed quote, we seal, and the work is guaranteed. Childs Hill is one of 764 places in Greater London on our list. Our London page has more on work in that area, about 6 miles away.
We cover the NW2, NW3 and NW11 postcode districts for mastic packages. If your site is on Nant Road, Ridge Road and Garth Road or close by, send details and we’ll quote for mastic packages. Nearby places we also cover include Fortune Green (1 mile south), West Hampstead (1 mile south-east), Golders Green (1 mile north), North End (1 mile north-east) and Vale of Health (1 mile east). Nearby towns on our patch include London (6 miles south-east), City of Westminster (4 miles south-east), Marylebone (4 miles south-east), Kensington (4 miles south), St Pancras (4 miles south-east) and Shoreditch (6 miles south-east).
Landmarks near Childs Hill
We work on buildings around St Vedasts School For Boys, Hampstead School and The Old Bull and Bush pub. For rail, the closest station is Cricklewood station, roughly 0.7 miles south-west. A little further out are O2 Centre (1.2 miles south-east) and New End Hospital (0.9 miles east). Open spaces near Childs Hill include Parliament Hill and Westbere Copse.
Places near Childs Hill
More services for Childs Hill
Questions about Childs Hill
Do you work in London buildings with loading restrictions?
Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. Say when the building is occupied and when it’s quiet, and we will plan accordingly. We allow for the ULEZ, which covers every borough
Can you work around term dates at a campus such as Middlesex University?
Yes, holiday working periods are the norm on campus jobs. Tell us which site documents you need, such as RAMS, our insurance certificate or CSCS details, and they’re confirmed with the quote.
Can you work to our specification?
Yes. The specification and the manufacturer’s installation guidance are what we work to, and we raise anything unclear before work begins.
Can you clear a mastic snag list before handover?
Yes. We can work through a mastic snag list area by area before handover and damaged joints are redone properly.
Do you do internal caulk as well as external mastic?
Inside and out: frame perimeters, movement joints, caulk where called for, sanitary and kitchens.
Do you need to see the site first?
It depends on the job. Simple work can often be priced from photographs, while larger or less clear jobs get a site visit first.
What happens if old sealant might contain asbestos?
Asbestos is possible in some older mastics, particularly in buildings from before 2000. We check the asbestos register before cutting out old sealant in an older building, and work stops until any suspect material has been tested. Removing asbestos is a job for asbestos specialists, not us.