Hertfordshire · England
Window Mastic in Gustard Wood
Window mastic across Gustard Wood and nearby, with every bit of old sealant taken out first and a one-year guarantee.
- Gaps where the sill meets the wall
- Sealant in the wrong colour for the frame
- Gaps between the frame and the inside reveal
Why act early in Gustard Wood
Failed mastic isn’t a reason to replace sound windows. Where the frames are sound, new mastic generally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. Where a wall is exposed, as many are in small places like Gustard Wood, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in Gustard Wood
- A choice of colours where the product allows
- Experience in homes, commercial sites and hotels
- We never seal over old sealant
- We leave the area clean and tidy
Read what affects the cost and what customers say.
Window mastic in Gustard Wood, done properly
From a single sill to a whole house of windows, you’ll get a clear quote before we start. Just ring 0345 464 0079 or email us and tell us how many frames there are and how they’re reached for window mastic in Gustard Wood. If you are dealing with cold air getting in at the frame edge and gaps between the frame and the inside reveal, we can help, whatever the surface.
Somewhere as small as Gustard Wood, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, so the sealant has to be chosen to suit the building.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Gustard Wood (AL4)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Gustard Wood
What else we do in Gustard Wood
Honest limits
In fairness, some problems need a different trade:
- A door that needs adjusting, rehanging or new seals
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp problems in the wall away from the window
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
Joints and surfaces we work on
- Composite doors
- Aluminium frames
- Patio & French doors
- Window sills
- Timber windows & doors
- uPVC windows
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
If you manage several properties in or around Gustard Wood, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Gustard Wood questions
Will you come out to Gustard Wood?
Yes, Gustard Wood is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you work for landlords with property near Harpenden station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or email us with the details for a clear quote.
Is it messy?
We keep the work tidy. We protect what’s around the joints.
Can new sealant go over the old?
No. We remove every bit of old sealant first.
Can resealing stop a draught around my window?
Often, yes. Air often gets in between the frame and the wall, and sealing the inside and outside joints closes that path.
What do you put in the joint?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Are you fully insured?
Yes. We’re fully insured for every job we do.
Is the work guaranteed?
Yes, with our one-year guarantee. A yearly look at the joints helps them last.
The process
All our tools and materials come with us in the van. Once we’ve agreed what’s being done, we protect the area and start. Most jobs take a morning for a couple of windows and a door. For a village or hamlet like Gustard Wood, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Finally we tidy up and check each joint.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
- For business premises, tell us about site rules or sign-in
Getting a quote
Need a quote? Please phone 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and send you a clear quote before any work starts.
Related advice
Common problems we fix in Gustard Wood
Mastic ages in the weather. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
Common reasons people contact us are:
- Water coming in at the bottom corners of a door
- Mastic that has split away from the wall
- A bead that does not match the frame
- Cracked internal joints between frame and plaster
For an older house near a landmark such as St Peter, the joint between an old wall and a newer frame is normally the first place rain gets in.
Questions to ask before you book
- How the joint is cleaned and prepared
- Which sealant they’ll use, and why
- How hidden problems are handled
- How long the guarantee is
What affects the cost of window mastic
You’ll get a clear quote before work begins. It takes into account:
- Whether old sealant or filler has to be cut out
- The size of the job
- Access and height
- Working hours on commercial sites
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
- Whether it has been sealed before
- What’s wrong with the joints now
We don’t publish a price list, as no two jobs are quite the same. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
Frames and glazing around Gustard 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. Historic houses like Shaw's Corner (about 1.2 miles north-east) are a reminder that the area around Gustard Wood has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Schools such as St Helen's Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Harpenden station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Gustard Wood is about 3 miles east of Harpenden, in Hertfordshire. Every kind of property in Gustard Wood can book us for window mastic, old or new, large or small. Every job comes with our 12-month guarantee. Gustard Wood is one of 381 towns and villages in Hertfordshire where we work. For nearby work, see our London page (24 miles or so).
Work in AL4 is quoted and booked the same way as anywhere else. Neighbouring places we cover for window mastic include Wheathampstead (1 mile south), Ayot St Lawrence (1 mile north-east), Kimpton (2 miles north), Ayot St Peter (2 miles east) and Codicote Bottom (2 miles north-east). Within a short drive, we also cover Watford (12 miles south), Hemel Hempstead (9 miles south-west), Stevenage (7 miles north-east), St Albans (5 miles south), Welwyn Garden City (5 miles south-east) and Harpenden (3 miles west).
Landmarks near Gustard Wood
Around Gustard Wood, our work takes us to homes and buildings near Sir John Lawes School and The Old Plough Public House, among other places. The closest station to Gustard Wood is Harpenden station, about 2.7 miles west. A little further out are St Albans City Hospital (5.1 miles south-west) and Harpenden Museum (2.9 miles west). For a walk, there’s Wheathampstead Local Nature Reserve.
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.