Hertfordshire · England
Mastic man in London Colney
Careful mastic and resealing for London Colney, from timber-framed cottages by the Colne to Napsbury Park conversions and the post-war estates.
- Old sealant cut out, never covered
- ARBOMaster approved
- One-year guarantee on every job
Mastic and sealant work in London Colney
London Colney sits on the River Colne about two and a half miles south-east of St Albans, close to junction 22 of the M25. For a village of under 10,000 people it has a wide spread of buildings, and each kind needs its sealant handled a little differently. Mr Mastic comes up from our base in Crawley to reseal bathrooms and kitchens and to renew mastic around windows and doors across the parish.
Some jobs are routine: a bath seal gone black, a worktop joint that has opened up behind the sink. Others need more thought, such as a painted timber casement in a listed cottage or a tall window in a converted hospital building. Our window mastic guide explains how we choose between modern sealants and more traditional finishes, and we’ll talk you through the options on the day.
Old village core, Napsbury Park and post-war estates
The heart of the village is the London Colney Conservation Area, first designated in 1974 and extended in 2010. It takes in the brick bridge of 1774, the triangular green at Waterside, St Peter’s Church of 1825 and the old coaching road along High Street and Barnet Road. Here you’ll find 16th and 17th century timber-framed houses, many later cased in brick, short runs of 18th and early 19th century brick cottages, and Victorian groups such as Mullingar Cottages of 1878. Much of the brick is painted or rendered, and traditional windows are painted timber casements, with some sashes and bays.
Since the Second World War, large housing estates have filled in the farmland around that core. These family houses and bungalows have mostly had their bathrooms and kitchens refitted, often more than once, and their original or replacement frames now need fresh mastic.
Napsbury Park is different again. The former Middlesex County Asylum, later Napsbury Hospital, opened in 1905 and closed in 1998. Crest Nicholson turned the site into about 500 homes, mixing new houses with apartments inside the original buildings, and it is protected as a conservation area. Converted buildings with deep window reveals and old masonry take a softer, more careful approach than a modern box.
Riverside cottages, conversions and village terraces
Buildings along the Colne near Waterside include some with low walls built to hold back floodwater, and homes close to the river and the lakes to the south-west see more damp in the air. That shortens the life of external mastic and encourages mould on inside joints, so we use anti-fungal silicone indoors and flexible, weatherproof external joint sealant outside.
In the conservation area, the aim is to keep timber casements and sashes looking right. We can work with painted joinery, match the bead to the frame and avoid anything that would look out of place. In the Napsbury Park apartments, we coordinate with the managing agent where work touches shared parts, and we plan around parking and access to the older blocks.
Colney Fields, village businesses and rented homes
Colney Fields retail park brings together large stores such as Sainsbury’s, Marks & Spencer, Next, Boots and TK Maxx, and units like these have staff toilets, kitchens and customer washrooms that need resealing from time to time. Our shop fitting sealant page covers new and refitted retail units.
The village itself has doctors’ practices, pubs, takeaways, salons and estate agents, along with landlords letting houses to people who commute to St Albans. We can work early or late for businesses, and between tenancies for rented homes.
How a job runs
- Call or email. Tell us what needs doing, where it is and anything about access. Photos by email help.
- 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.
- Seal and finish. The right sealant for each joint is applied and tooled to a neat, even finish.
- Guaranteed work. You’ll know the cure time before we leave, and every job comes with a one-year guarantee.
What we do in London Colney
- Bathroom & kitchen resealing: Every joint in the bathroom and kitchen, from the bath edge to the worktop, stripped back and resealed with anti-fungal silicone.
- Window & door mastic: Frame perimeters inside and out resealed with flexible, colour-matched sealant, with backing rod where the gap is deep.
- Commercial & hotel sealant: Commercial washrooms, kitchens and wet areas resealed floor by floor, so only a few rooms are out of use at once.
- Remedial sealant & repairs: Messy, layered or wrong-product sealant cut out and replaced with the right sealant, laid the right way.
- 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: 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: Leaking conservatory and rooflight joints, glass panels and shower screens resealed with silicone made for glass.
- Gutter, fascia & soffit sealing: Gutter unions, outlets and fascia joints that leak in heavy rain cleaned and resealed.
- Sand mastic for sash & case windows: Old sand mastic around sash windows and doors raked out and renewed with traditional burnt sand mastic.
Why choose Mr Mastic in London Colney
A 17th century cottage and a 1960s semi need different handling, and two decades in the trade have taught us how to treat both. We are an ARBOMaster approved applicator, fully insured, and we work with Arbo and Everbuild products. More than 2,847 projects are behind us, along with a 4.9-star Google rating from 180+ five-star reviews. We price the job clearly before starting, and the finished work is covered by a one-year guarantee.
Landmarks near London Colney
From the centre, the nearest railway station is Park Street station. Places most people will know nearby are The Maltings (2.5 miles north-west) and St Albans Musical Museum (2.6 miles north-west). Typical jobs near the centre are in homes and businesses around Bowmansgreen Primary School, Samuel Ryder Academy, Church of St Peter and White Horse pub. For open space, Broad Colney Lakes and Verulamium Lake are close by.
What customers say
Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.
“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.”
“1950s terrace on Crossways — bath had black mould coming back constantly. Mr Mastic stripped it all back and did it properly. Bathroom looks brand new.”
Where we work in London Colney
Select your area for more local detail, or call 07833 053749 or email us with your postcode.
Towns near London Colney
Questions from London Colney
Do you cover all of London Colney?
Yes. We cover the village centre, Waterside and the green, the post-war estates, Napsbury Park, and nearby places such as Shenley, Ridge and the edge of St Albans.
My cottage is in the conservation area. Can you reseal round timber casements?
Yes. We work carefully with painted timber frames and choose a sealant and colour that suit the building.
I live in a Napsbury Park apartment. Do you need the managing agent’s permission?
Not for work inside your flat. If anything affects the outside or shared areas, we’re happy to liaise with the managing agent first.
Why does the sealant near the river go mouldy so quickly?
Damp air keeps joints wet for longer, which helps mould grow. We remove the old bead, treat the area and use an anti-fungal silicone.
Can you work in a shop at Colney Fields before it opens?
Out-of-hours visits can be arranged so staff and customer facilities aren’t out of use during trading.
Will you seal over my old bath sealant?
No. New silicone won’t bond properly to old silicone, so we always cut it all out first.
How long does a typical bathroom reseal take?
Most baths or showers take a couple of hours. We’ll give you a clearer idea when we quote.