North Harrow mastic sealing
Mastic sealing in North Harrow, backed by over 20 years in commercial sealing. Fully insured and CHAS accredited.
- Communal area joints that look neglected
- Draughts at frames across a block
- Open joints in brickwork or panels
Need mastic sealing in North Harrow?
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Questions about North Harrow
Can you quote for a block close to Harrow-on-the-Hill station?
Yes. Managing agents, landlords, property factors and housing associations are who this service is for. Send the address, photos of the elevations and your access arrangements, and we’ll give a fixed quote.
Do you cover business parks and estates near North Harrow, such as Harrovian Business Village?
Yes. Our area takes in North Harrow and its surroundings, with estates and business parks such as Harrovian Business Village included. Send details of the unit and the work through our quote form for a quick quote.
How long does a job like this take?
The duration is planned around your programme and the access we are given. We will give you an estimate of time on site when we quote.
Do you work to architects’ specifications?
Yes. We follow the specification, along with the manufacturer’s installation guidance, and any queries are raised before we start.
How long before the joints can be used?
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.
Can you plan resealing across several buildings?
Yes. We survey and price each building, then work through them in order starting wherever is most urgent.
Do you work in North Harrow?
Yes. We take on work across North Harrow, and the same phone number covers every area.
About our mastic sealing in North Harrow
Managing agents and housing associations typically need paperwork before anyone starts. For documents, tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we will confirm with the quote. We are CHAS accredited and a Constructionline member, with public liability insurance. We work on external wall and movement joints, window and door perimeters on blocks and communal kitchens and washrooms, and what we’re called in for most is failed external movement joints and old repairs sealed over failed mastic. Whether you call it commercial sealant work, mastic application or joint sealing, the work in North Harrow is the same: failed joints cut out, faces prepared and the right sealant laid to the right depth.
London’s ULEZ covers every borough, and parking and loading rules vary street by street. For block-wide work, a place to park and store materials saves time on every visit.
The 12-month guarantee is for workmanship rather than wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we spell out the cover before we begin.
- Place
- North Harrow (HA2, HA1, HA5)
- Wider area
- Greater London
- Cover
- 12 months on our workmanship
- Quotes
- Quoted before any work starts
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
More services for North Harrow
Honest limits
We seal joints; we don’t mend everything behind them. On its own, sealant can’t deal with:
- Old mastic suspected of containing asbestos, which must be tested and dealt with by a specialist first
- Substrate edges that need repairing first
- Failed window or door frames, which need a window contractor
If you’re not sure, just call 01277 525 020 or email us and we’ll give you a straight answer.
Where we work in North Harrow
- Communal kitchens and washrooms
- Shopfronts below residential blocks
- Communal entrances and stairwells
- Balcony and threshold joints
- External wall and movement joints
- Window and door perimeters on blocks
Keeping the joints sound
For the best life from the joints:
- Make mastic part of routine maintenance checks
- Start inspections with the most exposed faces
- Avoid piecemeal callouts where you can
- Ask residents or tenants to report leaks and draughts early
Ask residents or tenants to report draughts or leaks round windows early. Early reports catch failures before damage spreads.
Left open, joint edges in render, brick or frames can deteriorate. Then the edges may need repairing first.
Surface by surface
Commercial and mixed-use buildings
Tenants in commercial buildings need to keep trading so the work is phased.
Communal areas
Communal areas stay in use while we work. Work is planned in sections.
Should maintenance staff do it?
A short, simple internal joint is often within reach of a maintenance team. Where it goes wrong is preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.
There’s also the paperwork. Many sites expect CSCS cards, RAMS and proof of insurance, and we’ll confirm the paperwork you need with the quote.
For managing agents and facilities managers
FMs need a contractor who is easy to get on site. Let us know the documents you need (RAMS, insurance certificate, CSCS details) and we will confirm them with the quote.
When you manage a building on behalf of an owner, clear figures and clear communication matter. You get a fixed quote, an agreed scope and a walk round at the end, plus a 12-month guarantee.
From enquiry to sign-off
The first thing on site is a walk round with your contact, agreeing which joints are in scope, where to start and what must stay open. Then we strip out anything that has failed, prepare every joint and seal it. 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 we look at the mastic on each building and note what needs replacing.
- You get a fixed quote, priced per building where that helps your budgeting.
- 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 as the joint requires, then the new bead is placed and tooled.
- Finished joints are looked over and the 12-month guarantee confirmed.
Before we start on site
- Warn occupants and staff about the work
- Send any specification or drawings in advance
- Tell us what induction or permit system the site runs
Request a quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we’ll price the work to it. Smaller jobs need nothing more than photographs and a few notes.
Related advice
Block-wide mastic in North Harrow
Blocks in London are typically run by managing agents, landlords or housing associations, with residents to notify and access to arrange. We work to your notice and access plan.
Landlords with units on estates such as Harrovian Business Village, 1 mile south-east of North Harrow, can bring frame, door and external mastic across several units into one programme. Churches, halls and community buildings such as Church of St Alban are looked after by trustees and committees like any other owner, and their frames, doors and external joints need mastic renewed in time. Blocks of flats and mixed-use buildings often cluster around stations such as Harrow-on-the-Hill station (to the east of North Harrow) and their window and balcony mastic tends to age at the same rate across a building.
North Harrow is about 1 mile north-west of Harrow, in Greater London. Looking for mastic sealing in North Harrow? We can help. We work across 764 places in Greater London, from busy centres to rural villages. There’s a separate page for London, about 13 miles away.
We take on mastic joints across the HA2, HA1 and HA5 postcode area, whatever the building. Buildings on The Avenue, Pinner Road and Durham Road are within our area. Sites close to North Harrow are covered too, including Rayners Lane (1 mile south-west), Harrow (1 mile south-east), Roxbourne (1 mile south-west), Eastcote (1 mile west) and Greenhill (1 mile east). Further afield, our area takes in London (13 miles south-east), City of Westminster (10 miles south-east), Marylebone (10 miles south-east), Kensington (9 miles south-east), St Pancras (11 miles east) and Shoreditch (13 miles east).
Near you in North Harrow
We work on buildings around Nower Hill High School, Heathfield School and Headstone Manor Recreation Ground and the streets around them. The closest station to North Harrow is Harrow-on-the-Hill station, roughly 1.2 miles east. Nearby you will also find St. George's Shopping Centre (1 mile east) and Hilfield Castle (5 miles north). The countryside around North Harrow includes Northala Fields and Islip Manor Meadows.