Mastic Man Harrow: Window, Bathroom & Commercial Sealant
Pinner semis, Wealdstone flats, Stanmore extensions and Harrow town-centre shops: we are the mastic man and sealant contractor Harrow homeowners, landlords and builders use for neat, durable mastic and silicone.
- From Bedford
- About 45 miles, via the M1 and A41
- Postcodes
- HA1, HA2, HA3, HA5 and more
- Typical work
- Semis, flats, schools & shops
- We work for
- Homeowners, landlords & builders
Metroland homes and a busy town centre
Harrow is classic Metroland: street after street of 1920s and 1930s semis around Rayners Lane, North Harrow, Kenton and Headstone, most of them now on their second or third set of replacement windows.
Every replacement window and door relies on a perimeter joint of mastic sealant, and on pebbledash, render and old brick those joints take a beating. We cut out the cracked or shrunken mastic and renew it in a colour that suits the wall, so the frames stay watertight and draught-free.
Around Harrow town centre, Wealdstone and Station Road there is newer work too: apartment blocks, school extensions and shopfronts that need commercial sealant, from movement joints in brickwork to glazing and cladding perimeters. As a sealant specialist covering Harrow, we take on both.
Harrow on the Hill, with St Mary’s spire looking out over west London, has older brick and stone that needs low-modulus, non-staining sealant rather than a quick bead.
Mastic and silicone sealant services in Harrow
Window mastic Harrow
Cracked perimeter mastic on uPVC and aluminium windows raked out and renewed, colour-matched to render, pebbledash or brick.
Window & door mastic →Door & threshold sealant
Front doors, French doors and bifolds sealed at the frame and threshold, so rain and draughts stay out.
Doors & thresholds →Bathroom resealing Harrow
Baths, showers and basins resealed with anti-mould silicone after the old sealant is fully removed.
Bathroom resealing →Kitchen silicone
Worktop and sink joints redone neatly, from laminate to quartz and granite.
Kitchen sealant →Commercial sealant contractor
Shopfronts, school extensions and apartment blocks: glazing, cladding and movement joints.
Commercial mastic →Brick movement joints
Vertical movement joints in brick and block resealed with polyurethane sealant and the right backer rod.
Expansion joints →More Harrow services: kitchen sealant · bathroom and shower resealing · concrete joint sealing · façade and curtain wall sealing · window and door mastic · expansion and movement joints
On site now at Salisbury Square, City of London
Right now we are working at Salisbury Square in the City, sealing frames into a natural stone façade with a non-staining silicone. Harrow windows get the same attention.
Replacement windows that stay sealed
Many Harrow homes had their windows replaced in the 1990s or early 2000s, and the original installers often used a cheap, stiff mastic that has since cracked away from the frame. You see it as a dark gap round the frame, and you feel it as a cold draught.
We remove every bit of the old sealant, clean the reveal, fit backer rod where the gap is deep and apply a flexible low-modulus sealant that can move with the frame. On pebbledash we choose a colour that blends in, rather than a bright white line.
- Old mastic fully removed
- Backer rod where gaps are deep
- Colour chosen to suit the wall
- Neat tooled finish
Shower and bath resealing across Harrow
Harrow’s family homes mean busy bathrooms, and busy bathrooms mean mould in the silicone. Bleach on top only hides it for a while; the fix is to strip the old sealant, kill the mould spores, let the joint dry and reseal with proper sanitary silicone.
We do the same for landlords between tenancies and for bathroom fitters.
We are also a polyurethane and polysulphide sealant applicator for commercial joints, handle new-build plot mastic and snagging for developers, and colour-match sealant on extensions so the joint disappears.
Insured & pre-qualified
Peace of mind for homeowners, builders and main contractors.
- £10m Employer’s LiabilityInsurance cover
- £5m Public Liability & Professional IndemnityInsurance cover
- Constructionline Silver member
- CSCS Skilled WorkerSealant Applicator (NVQ Level 2)
Over 20 years in construction
Products we use
Professional-grade sealants and adhesives from leading manufacturers.
Brand names and logos are trademarks of their respective owners and are shown to identify products we use. No endorsement is implied.
Harrow neighbourhoods we cover
Harrow town centre, Harrow on the Hill and Wealdstone, out to Pinner and Hatch End in the north-west, Stanmore and Harrow Weald in the north, and Kenton, Rayners Lane and South Harrow. Searching for a mastic man near me in Harrow? We are here.
Postcode districts we cover: HA1, HA2, HA3, HA5, HA7, HA8.
London pages: Mastic Man London · Area page: west London · Nearby boroughs: Brent · Ealing · Barnet · Project: Salisbury Square · Contact us
- Harrow on the Hill
- Harrow town centre
- Wealdstone
- Pinner
- Hatch End
- Stanmore
- Canons Park
- Harrow Weald
- Belmont
- Kenton
- Queensbury
- Rayners Lane
- North Harrow
- South Harrow
- Headstone
- West Harrow
Harrow sealant questions
Can you reseal the windows on a Harrow semi in a day?
Usually, yes. A typical semi with eight to ten windows and two doors is a day’s work, weather permitting, including cutting out the old mastic.
How much does a mastic man cost in Harrow?
Most Harrow quotes are based on how many windows and doors there are, plus access. Photos on WhatsApp are usually enough for us to fix the price up front.
Do you work for builders and developers in Harrow?
Yes. We seal new-build plots, extensions and commercial units, and can provide RAMS and insurance documents for site work.
Do you cover Pinner, Stanmore and Wealdstone?
Yes. We cover the whole borough, including HA1, HA2, HA3, HA5, HA7 and the Harrow side of HA8.
Need a mastic man in Harrow?
For Harrow, Pinner or Stanmore, ring 01234 607 252 or send photos to 07757 772 880 and we will reply with a price. Contractors can email drawings or a joint schedule to office@pioneersealants.co.uk. We have over 20 years in construction behind us.
- Opening hours
- Monday – Friday8:00am – 6:30pm
- Saturday9:00am – 4:00pm
- SundayClosed
