Mastic sealing for building owners and managing agents in Northwick Park, Greater London
Mastic sealing in Northwick Park, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.
- Open joints in brickwork or panels
- Repeated reactive repairs to the same buildings
- Cracked, hardened mastic round windows on a block
Mastic sealing near Northwick Park
Photos, a specification or a quick description of the joints is enough to start a fixed quote.
Mastic sealing for commercial buildings in Northwick Park
Treatment starts with a proper look: which joints have failed, why, and whether sealant is the right answer. Failed mastic is stripped, the faces taken back to sound material, primed where the manufacturer specifies and resealed and backing rod used wherever a joint is deep. We work on external wall and movement joints, shopfronts below residential blocks and window and door perimeters on blocks, and the failures we are asked to look at most are estate-wide sealant that is simply worn out and failed external movement joints. Searching for sealant specialists in Northwick Park? We’ve been sealing commercial buildings since 2005, CHAS accredited and a Constructionline member.
For managing agents in Northwick Park, resident access, notice periods and the building’s rules shape the job. Work is planned with the agent so residents get notice and access is arranged in advance.
We sign every job off with a 12-month guarantee. The promise is simple: if the work we did fails within twelve months, we return to fix it.
- Where
- Northwick Park (HA1, HA3, HA0)
- Wider area
- Greater London
- Cover
- 12 months on every job
- Quotes
- Quoted before any work starts
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
How the job changes by surface
Window and door perimeters on blocks
Blocks have a mix of frame materials, so the grade we pick has to bond to frame and wall alike. Colours are confirmed for the product used.
Tenement and older buildings
Natural stone can be marked by the wrong sealant and we choose accordingly.
For managing agents and facilities managers
We work for building owners and managing agents on sealant work across single buildings or whole portfolios. Several sites can go on one quote, which keeps the paperwork simple.
As a CHAS accredited contractor and Constructionline member, we’re straightforward to vet for your supplier list. We are fully insured, and our insurance certificate can go with the quote.
For owners and agents in Northwick Park
London blocks come with residents to inform, access to agree and often a concierge or estate office to work with. We work to your notice and access plan.
Schools and community buildings such as Harrow High School need frame and external mastic kept sound like any building. Older community buildings, Saint Cuthberts Church among them, often have frames of mixed ages whose mastic varies. If you own or manage units on a site such as Harrovian Business Village, 0.8 miles to the west of Northwick Park, failed mastic on frames, door surrounds and external joints can be dealt with unit by unit.
Northwick Park is about 1 mile south-west of Kenton, in Greater London. We cover commercial sites throughout Northwick Park, whether it’s a single job or part of a planned programme. Across Greater London, 764 places are covered, including Northwick Park. Sites around London have their own page, about 11 miles away.
We cover the HA1, HA3 and HA0 postcode districts. We cover commercial and managed buildings on Lyon Road, Manor Road and Gayton Road. Being close to the A404, Northwick Park is straightforward for us to reach. We also cover Greenhill (1 mile north-west), Harrow on the Hill (1 mile south-west), South Kenton (1 mile east), Kenton (1 mile north-east) and Harrow (1 mile west). Nearby towns on our patch include London (11 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles south-east), Kensington (7 miles south-east), St Pancras (10 miles east) and Shoreditch (11 miles east).
Around Northwick Park
In Northwick Park, that means premises near St Anselm's Catholic Primary School, Orley Farm School and Preston Park, among other places. For rail, the closest station is Kenton station, roughly 0.6 miles north-east. Other landmarks nearby include Northwick Park Hospital (less than half a mile north-east) and Kodak Museum (1.5 miles north-west). Green spaces nearby include Masons Field and Northala Fields.
Quoting for work in Northwick Park
To price the job, we consider:
- Joint width, depth and condition
- Phasing around occupants
- How accessible the joints are
- The product specified
What a job costs comes down to the quantity of joints, how much old material needs removing and the access. Call for a fixed quote once you have the details.
Details that help us quote
A few photographs plus some basic facts will normally do. Please tell us:
- Clear photos of the problem areas
- The site address and postcode
- Whether the building will be occupied during the work
- Approximate linear metres or a joint schedule
We quote a fixed sum against the scope you give us, so the cost is agreed before work starts. To ask for one, phone 01277 525 020 or send photos by email.
Doing it in-house
Some joints are best left to specialists: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. A poor seal in places like these tends to cost more to put right later.
Redoing a failed joint normally costs more than getting it right at the outset, since all of it has to come out and the faces be cleaned back again. For that reason, many FMs and contractors use a sealant specialist from the outset.
From enquiry to sign-off
A typical day starts with protection: tape along each joint edge and covers over finishes, stock and equipment close by. On site, the work typically takes anything from a day to a few weeks, depending on the number of buildings and joints, and we clear our waste as we work. 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.
- First comes a look at the joints and, for older buildings, the asbestos records.
- A fixed quote covers the joints, products and order of work.
- We strip out the old sealant.
- The joints are prepared and resealed with the right product.
- Buildings are completed in turn.
Preparing the site
- Arrange parking or a loading space
- Make sure the joints can be reached
- Flag any permit to work we’ll need
Quotes
Send us photographs, drawings or a joint schedule and a fixed quote comes back to you. Where a site visit makes more sense, we will arrange one.
Related advice
FAQs: Northwick Park
We manage a building near Kenton station. Can you help?
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 will give a fixed quote.
Will you take on work at estates like Harrovian Business Village, close to Northwick Park?
Yes, sites like Harrovian Business Village are within our area, along with the rest of Northwick Park. To start, just call 01277 525 020 or email the details over with the unit, the joints involved and your access times.
Can you reseal a whole block or estate?
Block-wide and estate programmes are common. The quote can be split however suits your budgeting.
Can you work to our specification?
Yes. Include it with the drawings when you ask for a quote, and the quote will be based on it, flagging anything that needs clarifying.
How long does a typical visit take?
We plan the time on site around your programme and access. We’ll give you an estimate of time on site when we quote.
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, so we will confirm the curing time on the day.
What about access for upper-floor joints?
It depends on the building. We agree access with you at quote stage so the fixed quote reflects it.
Also near Northwick Park
More services for Northwick Park
Leave it or put it right?
Replacing mastic before water gets in is a planned job. Once water has tracked in, the repair list grows, and the complaints come with it. Getting scaffold, permits or access booked in Northwick Park takes effort, so it makes sense to deal with every failing joint while access is in place.
There’s no price list, since every building and every scope is different. Call for a quote and we will price your job on its own details.
Why choose Mastic Doctor in Northwick Park
- Workmanship guaranteed for 12 months
- RAL and finish matching where the product range allows
- Our applicators hold CSCS cards
- Colour agreed before work starts
Take a look at what affects the cost and how we’re accredited.