Hertfordshire · England
How Wood New Build Mastic
Professional new build mastic in and around How Wood, with old sealant always removed completely and a 12-month guarantee.
- Gaps opening as the house dries out and settles
- Kitchen sealant that has pulled off the wall
- Leaking shower tray seals in a new home
What affects the cost of new build mastic
There’s no set price list, because no two jobs are the same. What we look at:
- Whether old sealant or filler has to be cut out
- The number and length of the joints
- Working hours on commercial sites
- Mould in or behind the old joints
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Asking for a quote
To make quoting easier, please include:
- Photos by email, if that’s easy
- Any previous sealing or DIY work
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
New build mastic in How Wood, done properly
We work in new homes and on new-build sites across How Wood. Whether it’s one en suite or a run of plots, the method is the same: cut out, clean, prime where needed and reseal neatly. We work on windows & doors, skirting & floors and plot handovers, and people most often call us about beads laid onto grit and dust from the build and untidy sealant flagged on a snagging list.
In and around How Wood, floors range from older timber boards to tiles and newer finishes, from timber that moves with the seasons to tiles laid on concrete. Skirting and threshold joints need a sealant that suits the floor.
All our work comes with a one-year guarantee.
- Location
- How Wood (AL2)
- Wider area
- Hertfordshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
More services for How Wood
Honest limits
It helps to know what we cannot do too:
- Leaks from pipes, valves or wastes, which need a plumber
- Damaged fittings that need replacing
- Deciding who is responsible under a builder’s warranty
If you are not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Skirting & floors
- Show homes
- Bathrooms & en suites
- Kitchens
- Windows & doors
- Plot handovers
For landlords and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will quote.
Failed sealant is one of the commonest items on a check-out report. Several properties can be quoted together.
What we do, step by step
Every visit runs the same way: we check the joints, protect the area around them, do the work and tidy away. Most jobs take a few hours in a single home. For a job in How Wood, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First we work through your snagging list or plot schedule with you.
- Failed or untidy sealant is cut out completely.
- Surfaces are cleaned of building dust and primed where needed.
- A sealant chosen for each area goes in and is tooled smooth.
- Each area is checked and left with its cure time.
Preparing for the visit
- Clear the area around the work
- Where the joints are inside, avoid wetting them before we arrive
- Mention any tricky access
Ask for a quote
For a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
Related advice
What the job involves on each surface
Show homes
We can refresh show-home sealant that has discoloured or been knocked. The old bead comes out and a clean new one goes in.
Bathrooms and en suites
Baths, showers, basins and trays in new bathrooms are the most common new-build reseal. We cut out the failed bead, clean and prime, and reseal with anti-fungal sanitary silicone.
New homes and floors in How Wood
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around How Wood, as everywhere, new build mastic is only as good as the preparation behind it. For new homes near How Wood station, it’s worth checking the sealant early, while snags are still fresh.
How Wood is about 2 miles south-west of St Albans, in Hertfordshire. Jobs in How Wood get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Our area takes in 381 places across Hertfordshire, large and small. London is on our list too, around 19 miles away.
Here we cover the AL2 postcode area for new build mastic. Local streets include Ringway Road, Alder Close and How Wood. If you are just outside How Wood, we cover Park Street (1 mile north-east), Chiswell Green (1 mile north-west), Frogmore (1 mile east), Bricket Wood (1 mile south-west) and Colney Street (1 mile south-east). Within a short drive, we also cover Watford (4 miles south-west), Hemel Hempstead (5 miles north-west), Stevenage (15 miles north-east), Welwyn Garden City (9 miles north-east), Harpenden (7 miles north) and Hoddesdon (15 miles east).
Around How Wood
Typical jobs here are in homes near Marlborough Science Academy and The Falcon pub. There’s a railway station in How Wood itself: How Wood station. Nearby you will also find Hilfield Castle (4.6 miles south) and Hypocaust Museum (2.1 miles north). The countryside around How Wood includes Broad Colney Lakes and Verulamium Lake.
Common questions in How Wood
Do you cover smaller places like How Wood?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Is How Wood in your area for new build mastic?
Yes. Our work covers London and the South East, and How Wood is part of that. You can call 0345 464 0079 or drop us an email and let us know what needs doing.
Do you work for landlords and businesses?
Yes, often. We can quote for several properties at once.
What information do you need?
A short description and the location, plus photos if you have them. If we need more, we will ask.
Are you fully insured?
Yes, we’re fully insured for domestic and commercial work.
What colour sealant will you use?
It depends on the joint: white or clear in most bathrooms, and a colour to suit worktops, frames and floors elsewhere. We agree the colour before we start.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Where do you work from?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
Why it’s worth doing now in How Wood
If you’re still in the builder’s snagging or warranty period, ask them to put it right first. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. In an older home around How Wood, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts, so you know where you stand.
Why book with us
- Domestic, commercial and hotel work
- Sanitary silicone with an anti-fungal additive in wet areas
- We leave the area clean and tidy
- An ARBOMaster approved applicator
Take a look at what affects the cost and our reviews.