Hertfordshire · England
Mastic man in Harpenden
Anti-mould resealing and window mastic for Harpenden’s Victorian and Edwardian houses, interwar roads and the estates of Batford and Southdown.
- 20+ years’ experience
- ARBOMaster approved applicator
- One-year guarantee
Resealing and mastic work across Harpenden
Black spots creeping along the bottom of a shower screen are the most common reason Harpenden homeowners get in touch. Often the sealant itself is only a few years old, but the mould is living behind it, in a joint that was never cleaned out properly. Covering it again only buys a few months.
Mr Mastic covers Harpenden from our base in Crawley. We strip out old silicone, treat the joint, let it dry and reseal with anti-fungal products, and our anti-mould resealing page explains the method. We also reseal baths, basins and kitchens, replace mastic around windows and doors, and seal external joints on houses, flats and commercial buildings across the town.
Railway villas, a horseshoe of Edwardian roads and 1930s growth
The Midland Railway reached Harpenden in 1868, and farmland was sold for housing over the following decades. Milton Road was the first development after the railway, the Avenues followed from 1895, and builders worked plot by plot, so streets were filled piecemeal. By 1912 the houses formed a horseshoe around the old village core. The conservation area, first designated in 1969, is one of the largest in the county and takes in the town centre, the Common, Hatching Green and those post-railway suburbs, with red brick, tile hanging, roughcast and painted timber sash windows.
The 1930s brought fast growth, with ribbon development along existing roads and new streets in between; a little earlier, Highfield Oval had been laid out as a garden suburb around 1912–13. After the war, Batford, Southdown and the town joined up, and the 1970s and 1980s added larger estates such as Aldwickbury, Wood End and Beesonend.
Older houses need soft, discreet joints; interwar and post-war homes often have replacement windows and bathrooms that have been redone several times. On those, we often find a newer bead laid over an older one, which traps mould and lets moisture creep in behind, so everything comes out before we start again.
Large period homes, en-suites and wet rooms
Many of Harpenden’s bigger Victorian and Edwardian houses now have several bathrooms, including en-suites built into old bedrooms and lofts. Timber floors under those showers flex, and if a tray or tiled floor is not sealed well, water can reach ceilings and cornices below. Where homeowners have chosen level-access showers, our wet room sealing service covers the joints that keep them watertight.
Edwardian houses often have little or no off-street parking, so we check access when you book and bring only what the job needs into the house. In the conservation area we keep external joints slim and in colours that suit white sashes, red brick and tile hanging.
High Street restaurants, research campus and schools
Harpenden’s High Street has many independent shops, restaurants and cafés, with kitchens and customer toilets that see daily use. Rothamsted Research, the large agricultural research centre based in Harpenden, has offices and laboratories, and schools such as Roundwood Park, Sir John Lawes and St George’s have washrooms and changing areas to keep sealed.
Landlords and agents call us for tenancy changeovers, and we can work out of hours for businesses that can’t close. Care homes, clinics and surgeries can ask for anti-bacterial sealant, and we can stage work so rooms come back into use as each one cures.
How a job runs
- Tell us about the job. A quick call or email with what needs sealing and where. Photos help us quote accurately.
- Quote and booking. We quote clearly before anything starts and fix a day that works for you.
- Cut out and prepare. All the old sealant comes out, and the joints are cleaned, treated and dried.
- Lay the new bead. We apply the right product for each joint and tool it to a clean, even line.
- Cure and guarantee. We tell you when it can be used, and every job has our one-year guarantee.
Jobs we take on in Harpenden
- Bathroom & kitchen resealing: Baths, showers, basins, wet rooms, worktops and sinks: old sealant cut out, mould treated and a new bead of anti-fungal silicone laid.
- Window & door mastic: Cracked or shrunken mastic around window and door frames, sills and patio doors replaced with a weatherproof sealant.
- Commercial & hotel sealant: Guest bathrooms, staff washrooms and kitchens in commercial buildings resealed in a planned order that keeps the site running.
- Remedial sealant & repairs: Leaks and lifting beads from earlier sealant jobs put right, starting with finding out why they failed.
- Fire-rated sealant: Fire-rated sealant for service penetrations and frame gaps where it has been specified, applied to the tested details.
- External & façade joints: Outside movement joints given new backing rod and a flexible, weatherproof sealant in a colour to match the wall.
- New-build mastic & snagging: Failed builder sealant in new homes put right, and plot mastic for developers.
- Floor & skirting joints: Skirting-to-floor gaps, tiled floor movement joints and concrete floor joints sealed with the right product.
- Regrouting: Crumbling grout in showers and wet areas raked out and refilled, so water stays out of the wall behind.
- Glazing & conservatory sealant: Glass-to-frame joints on conservatories, rooflights and shower screens cut out and resealed.
- Gutter, fascia & soffit sealing: Dripping gutter joints and end caps, and gaps at fascias and soffits, sealed with weatherproof exterior sealant.
- Sand mastic for sash & case windows: Traditional sand mastic for period windows and doors where a modern sealant would look out of place.
What you get with Mr Mastic in Harpenden
Choosing someone to work in your home is a fair question to take time over, and our guide to choosing a mastic man covers what to ask. For our part: more than 20 years in the trade, full insurance, ARBOMaster approved applicator status, Arbo and Everbuild sealants, 2,847+ projects and a 4.9-star Google rating from 180+ five-star reviews. You’ll see a clear quote before we start, and a one-year guarantee follows.
Landmarks near Harpenden
From the centre, the nearest railway station is Harpenden station. Well-known places nearby include Harpenden Museum (less than half a mile south-west) and Luton Castle (5 miles north-west). Closer in, we work on homes, rented flats and businesses near Harpenden Academy, Sir John Lawes School, St Nicholas Church and The Junction pub. Nearby green spaces include Wheathampstead Local Nature Reserve and Verulamium Lake.
What customers say
Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.
“Called for a bathroom reseal and the mastic man showed up on time with all the right equipment. Brilliant attention to detail. The sealant looks perfect and they kept everything tidy.”
“We had old mastic that needed replacing throughout our kitchen and bathrooms. The mastic man professional was knowledgeable, quoted fairly, and delivered excellent quality work. Highly recommend!”
“Professional mastic man service from start to finish. They assessed the work properly, gave a clear quote, and executed the job perfectly. Very satisfied with the results.”
Areas of Harpenden we cover
Select your area for more local detail, or call 07833 053749 or email us with your postcode.
Towns near Harpenden
Questions we’re asked in Harpenden
Do you cover all of Harpenden?
Yes. We cover the town centre, the Avenues, Batford, Southdown, Kinsbourne Green, West Common and the newer estates, plus nearby Wheathampstead and Redbourn.
Why does mould keep coming back on my shower seal?
It usually survives behind the old sealant. We remove it all, treat the joint, dry it and reseal with anti-fungal silicone.
Can you seal a loft en-suite on a timber floor?
Yes. We use a sanitary silicone with good movement, and fill a bath or load a tray while it cures where that helps.
Do you work on houses in the conservation area?
Yes. We keep joints neat and use colours and products that suit the building’s original materials.
Can you reseal a restaurant kitchen on the High Street?
Yes. We can work before opening or after closing and use food-safe products near preparation areas.
Do you seal wet room floors?
Yes. We seal the perimeter and the joints around drains, screens and fittings so the room stays watertight.
How long does a reseal take?
A single bath or shower usually takes a few hours, plus curing time before use.
Can you reseal around a roll-top bath?
Usually there is no wall joint, but we can seal around the waste, taps and any floor joint so the surrounding floor stays dry.