Hertfordshire · England
Mastic man in St Albans
Neat, colour-matched resealing for St Albans homes, from Fishpool Street cottages and Clarence Park villas to Marshalswick and Jersey Farm.
- Fully insured
- Arbo and Everbuild sealants
- Clear quote before we start
Sealant jobs we do in St Albans
St Albans homeowners tend to notice detail. A bright white bead slapped round a cream bath or a period window stands out in a city where so many houses have been looked after for generations. Good resealing should be almost invisible: straight, tight to the joint and in a colour that suits the surfaces either side.
Mr Mastic covers St Albans from our base in Crawley. We reseal baths, showers, basins and kitchens, replace mastic around windows and doors, and seal external joints on houses, flats and commercial buildings. Where tiles, trays or worktops are not plain white, our colour-matched resealing service helps the new joint blend in. Every job begins with the old sealant coming out completely, and any mould treated before the new bead goes on.
A cathedral city that grew in rings
The historic core around the cathedral and Market Place holds timber-framed and Georgian buildings, and Fishpool Street runs down from Romeland to St Michael’s village. Much of the centre is covered by the St Albans conservation area. Old timber frames and soft brick move with the seasons, so external joints there need soft, flexible materials.
The railway arrived in 1858, and a building boom at the end of the century pushed the population up by 37% between 1891 and 1901. Around Clarence Park, most homes went up between the 1880s and 1920s: large Edwardian and late Victorian houses, terraced cottages with bay windows, and sash or casement windows set in red brick. Fleetville and the streets off Hatfield Road add rows of terraces and interwar semis.
Further out, Marshalswick was built up from the 1920s on the grounds of a sold mansion, with a second large estate from the 1950s on former farmland, and Jersey Farm followed in the 1970s. Their bathrooms have usually been refitted at least once, and the uPVC windows that replaced original frames now often have hard, cracked mastic.

Converted villas, tight parking and period windows
Many large Victorian and Edwardian houses in St Albans have been split into flats, and bathrooms in conversions are often squeezed into old bedrooms with timber floors. A failed bath or shower seal in an upper flat can stain the ceiling below within weeks, so we treat those jobs as a priority and can arrange access through the managing agent where needed.
Parking near the centre and in the terraced streets can be tight, so we ask about permits and access when you book. On sash and casement windows we take care around old paintwork and glazing, and we use traditional or flexible products that suit the frame rather than thick modern beads. Outside, joints where bay windows meet brickwork and where newer extensions join the original walls are common places for gaps to open up.
Restaurants, offices, colleges and healthcare
The city centre has a dense mix of restaurants, cafés and pubs whose kitchens and washrooms see hard use, and our restaurant sealant work is planned around service times. Offices along Hatfield Road and in the centre need staff kitchens and toilets kept in good order, and schools and colleges, from St Albans School to Oaklands College’s Smallford campus, have washrooms and changing areas to maintain.
Clinics and care settings near St Albans City Hospital need hygienic, anti-bacterial products, which our healthcare sealant page explains.
How it works
- Get in touch. Call or email with the job, your postcode and a few photos if you have them.
- Quote and booking. We quote clearly before anything starts and fix a day that works for you.
- Preparation first. Old sealant out completely, surfaces cleaned, mould treated and the joint left dry.
- Lay the new bead. We apply the right product for each joint and tool it to a clean, even line.
- Leave it to cure. We tell you how long to leave it before use, and the work carries our one-year guarantee.
What we do in St Albans
- Bathroom & kitchen resealing: Bathroom and kitchen joints taken back to a clean, dry surface and finished with fresh anti-fungal silicone that won’t lift.
- Window & door mastic: Window and door mastic that has dried out in the sun replaced with a weather-resistant joint that can move with the frame.
- Commercial & hotel sealant: Hotels, offices, washrooms and welfare areas resealed room by room, with out-of-hours working possible to arrange.
- Remedial sealant & repairs: Second opinions on sealant that keeps failing: we strip it out, check for movement or leaks and reseal it properly.
- Fire-rated sealant: Intumescent and fire-rated joints around pipes, cables and frames, installed to the manufacturer’s tested specification.
- External & façade joints: Expansion joints in brick, render and cladding cut out and renewed at the right depth so they can move without splitting.
- New-build mastic & snagging: Failed builder sealant in new homes put right, and plot mastic for developers.
- Floor & skirting joints: Movement joints in tiled and concrete floors, and skirting gaps, sealed so they stay tidy and keep dirt out.
- Regrouting: Cracked, stained or crumbling grout raked out and replaced, with corners resealed in silicone.
- Glazing & conservatory sealant: Glazing joints on conservatories, roof lanterns and screens renewed with a sealant suited to glass and frames.
- Gutter, fascia & soffit sealing: Leaking gutter joints, end caps, fascia and soffit joints resealed with 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 St Albans
We’d rather show our standards than describe them, but here are the basics. Mr Mastic has over 20 years’ experience and full insurance, and we’re an ARBOMaster approved applicator using Arbo and Everbuild sealants. Across 2,847+ projects we’ve earned a 4.9-star Google rating from more than 180 five-star reviews. Each job comes with a clear quote before work starts and a one-year guarantee when it’s done.
Getting around St Albans
From the centre, the nearest railway station is St Albans station. Well-known places nearby include The Maltings (less than half a mile west) and St Albans Musical Museum (0.5 miles north-east). Typical jobs near the centre are in homes and businesses around Alban City School, Loreto College, Verulam School and Church of St. Peter. Nearby green spaces include The Wick Local Nature Reserve and Verulamium Lake.
What customers say
Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.
“Harper Drive in Maidenbower — kitchen worktop had been leaking behind for a while. Came out the next day, sorted it properly. Really tidy job.”
“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!”
Areas of St Albans we cover
Find your area below, or call 07833 053749 or email us with your postcode and a few details.
Nearby towns we cover
St Albans: common questions
Do you cover all of St Albans?
Yes. We cover the city centre, St Michael’s, Fleetville, Clarence Park, Bernards Heath, Marshalswick, Jersey Farm, Sopwell, St Stephens and Chiswell Green, plus nearby London Colney and Sandridge.
Can you match the sealant to cream or grey tiles?
Yes. We carry a range of colours and choose the closest match to your bath, tray, tiles or worktop.
I have a flat in a converted Victorian house. Can you work around the other residents?
Yes. We’ll arrange access with you or your managing agent and keep shared areas clean and clear.
Do you reseal sash windows?
Yes. We remove failed filler or mastic around the frame and use a traditional or flexible product that suits the window.
Can you reseal a restaurant kitchen without closing for the day?
Usually. We work between services or out of hours and use food-safe products near preparation areas.
My Jersey Farm bathroom sealant keeps going black. Why?
Mould often survives behind old sealant. We remove it all, treat the joint, let it dry and reseal with anti-fungal silicone.
Is parking a problem?
Let us know about permits or restrictions when you book and we’ll plan around them.
Can you reseal a bathroom in a 1930s Marshalswick house?
Yes. Bathrooms in those homes have usually been refitted more than once, so we remove every layer of old sealant before resealing with anti-fungal silicone.
