Mastic sealant contractors in Colindale
Mastic sealing for Colindale, from a contractor working since 2005. Fully insured and CHAS accredited.
- Worn sealant at communal door frames
- Leaks at window and door perimeters
- Patchy repairs in mismatched sealant
Need mastic sealing in Colindale?
Share the site address and what’s failing, and we’ll reply with a fixed quote or arrange a visit.
Mastic sealing in Colindale
Across Colindale and the rest of Greater London, we work the same way: you send details, we return a fixed quote, the joints are resealed and the 12-month guarantee follows. A list of buildings, a few photographs and approximate joint numbers are enough for a quick quote, and site visits can be arranged. The enquiries we see most involve movement joints with sealant missing and the same joint failures repeated across a portfolio, across communal kitchens and washrooms, communal entrances and stairwells and window and door perimeters on blocks. Whoever orders the work in Colindale, the brief is usually the same: a clear scope, tidy work and joints that don’t fail again.
Across Greater London, Colindale 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.
Our 12-month guarantee is about workmanship, not wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we spell out the cover before we begin.
- Location
- Colindale (NW9, NW4, HA8)
- Region
- Greater London
- Cover
- 12 months on every job
- Quotes
- Quoted before any work starts
- Call
- 01277 525 020
- Last updated
- 3 November 2026
How the quote is worked out
Quotes vary with the job. It mainly depends on:
- Removal of failed or old sealant
- The product specified
- How accessible the joints are
- Induction, permit and paperwork requirements
A quote for mastic joints depends on quantities, condition and access, and any specification that applies. Ask us for a fixed quote.
Details that help us quote
It doesn’t need to be a full survey. These details are enough to start:
- Asbestos survey details if the building is older
- A wide shot and a close-up of the area
- When you need the work done
- Access details, including height
Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to call the office on 01277 525 020 or email us with what you know.
What sealant work can’t fix
Our job is the joint, not everything around it. On its own, sealant can’t deal with:
- Masonry that has broken away beside the joint
- Failed window or door frames, which need a window contractor
- Roof leaks, gutters or failed flashings that aren’t sealant joints
If you are not sure, just phone 01277 525 020 or send details through our quote form and we will give you a straight answer.
Joints and surfaces we work on
- Balcony and threshold joints
- Shopfronts below residential blocks
- Window and door perimeters on blocks
- Communal entrances and stairwells
- Communal kitchens and washrooms
- External wall and movement joints
Should maintenance staff do it?
A short, simple internal joint is often within reach of a maintenance team. The usual problems come from preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.
For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint.
For owners and agents in Colindale
Two care or nursing homes sit less than 2 miles from Colindale. Care home owners need frame and external mastic kept sound without unsettling residents. In London, mastic work on a block goes through the managing agent or landlord, with notice to residents. We plan around the notices and access you arrange.
Schools and community buildings such as Colindale Primary School need frame and external mastic kept sound like any building. For agents with blocks near Hendon station, 1 mile south-east of Colindale, a block-wide mastic programme deals with frames, balconies and entrances in one go.
Colindale is about 1 mile south-east of Burnt Oak, in Greater London. Colindale sits inside our coverage and the rest of Greater London, with the same fixed quotes and 12-month guarantee as everywhere else. 764 places across Greater London fall within our area, Colindale among them. Our London page has more on work in that area.
Commercial sites across NW9, NW4 and HA8 are covered. If your site is on Cecil Road, Booth Road and Ajax Avenue or close by, we can quote for mastic joints. Main routes into Colindale include the A5150, useful when we plan access and materials. Nearby places we also cover include West Hendon (1 mile south), The Hyde (1 mile south), The Burroughs (1 mile east), Hendon (1 mile south-east) and Kingsbury (1 mile south-west) for mastic joints. A short drive away, we cover London (9 miles south-east), City of Westminster (7 miles south-east), Marylebone (7 miles south-east), Kensington (7 miles south), St Pancras (7 miles south-east) and Shoreditch (9 miles south-east).
Near you in Colindale
Around Colindale, our work takes us to commercial buildings near Sunny Hill Park, Saracens High School and Kisharon College. Colindale’s nearest station is Hendon station, about 1 mile south-east. Other landmarks nearby include Edgware Community Hospital (1.3 miles north-west) and Brent Cross Shopping Centre (1.5 miles south-east). The countryside around Colindale includes Darland's Lake and Parliament Hill.
Our process
Site rules come first: signing in, inductions and any permit to work. With the paperwork done, the joints are worked through in the order agreed with your site contact. Most London premises stay occupied while we are on site, so zones and timings are agreed with whoever manages the building. Phased work keeps the rest of the building in use.
- A building-by-building inspection lists the failed joints.
- You get a fixed quote, per block or for the whole programme.
- We agree the programme and dates with you.
- Failed sealant is removed and the faces prepared.
- New sealant goes in with backing rod and primer where needed.
- Each building is checked and signed off with the 12-month guarantee.
Before we start on site
- Share the asbestos register for older buildings
- Flag any permit to work we will need
- Warn occupants and staff about the work
Ask for a quote
Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, phone 01277 525 020 or email drawings and photos.
Read more
Towns and villages near Colindale
What else we do in Colindale
Questions about Colindale
Can you work at a site such as Colindale Retail Park, by Colindale?
Yes. Estates, retail parks and business parks around Colindale, Colindale Retail Park among them, are all within reach. A few photographs and the unit address let us price the work.
Will you take on a block within reach of Hendon station?
Yes. Managing agents, landlords, property factors and housing associations are who this service is for. Send the address, photographs of the elevations and your access arrangements, and we’ll give a fixed quote.
Can you reseal a whole block or estate?
Yes. Each building is inspected, quoted and scheduled in turn starting wherever is most urgent.
Do you work in Colindale?
Yes. We cover Colindale, and the simplest way to start is to give us a call on 01277 525 020 or email us.
What if the old mastic contains asbestos?
Asbestos removal isn’t part of our work. If old sealant is suspected, work stops until it’s tested, and the duty to manage asbestos sits with the dutyholder.
Do you work to architects’ specifications?
Yes. We follow the specification, along with the manufacturer’s installation guidance, and we raise anything unclear before work begins.
Do you supply RAMS and insurance details?
Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we will confirm with the quote. We hold CHAS accreditation and Constructionline membership.
Do you need mastic sealing in Colindale?
UV and rain age external sealant. It stiffens, stops stretching and cracks, especially on south and west faces.
Clients usually get in touch after noticing something like this:
- Damp patches beside frames
- Repeated reactive repairs to the same buildings
- Worn sealant at communal door frames
- Mastic failing across several blocks on an estate
Property owners at sites such as Colindale Retail Park (to the west of Colindale) can have mastic renewed between lettings.
What to look for in a quote
- What site paperwork they can supply
- Whether their applicators hold CSCS cards
- What level of public liability insurance do they hold?
- Their plan for phasing and protecting the area
Why deal with it now?
Dealing with failed joints one report at a time is slow and scattered. A planned programme treats each building once and is simpler to manage and budget. 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.
No two sites price the same: joint size, product, access and site hours all play a part. A fixed quote follows once we understand the job.
Why appoint us
- CHAS accredited
- Fully insured, including public liability cover
- Commercial sealant work since 2005
- Fixed quotes based on photographs, drawings or a visit