Hertfordshire · England
Window & door mastic in Borehamwood, Hertfordshire
Window mastic for Borehamwood, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Black, perished sealant on frames
- Damp patches on the reveal after heavy rain
- Cracked internal joints between frame and plaster
About our window mastic in Borehamwood
Homes in Borehamwood have every kind of window: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on composite doors, timber windows & doors and patio & French doors, and people most often call us about black, perished sealant on frames and gaps left after new windows were fitted.
Around Borehamwood, many houses have gained conservatories, French doors or replacement windows over time. Every addition brings more joints, each wearing at its own pace. Leaks normally start at a sill, a frame head or a glazing joint.
All of our work is guaranteed for twelve months.
- Location
- Borehamwood (WD6)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Surface by surface
Aluminium frames
Aluminium needs a sealant that bonds to coated metal. We use a neutral-cure product.
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. We pay most attention there.
Leave it or put it right?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Around Borehamwood, failed sealant lets water into hidden places, such as under the floor, behind a panel or into a wall. Left alone, that means rot, damp and a bigger repair.
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 Borehamwood clients choose us
- Homes, businesses and hotels
- You choose the colour before work begins
- 180+ five-star Google reviews
- A sealant colour to suit the surroundings
Read what affects the cost and what customers say.
Borehamwood: your questions answered
Is there a guarantee on window mastic in Borehamwood?
All our work, in Borehamwood and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Can you help a landlord with a rental near Elstree & Borehamwood station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Is the new sealant paintable?
Silicone generally will not take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
Where are you based?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that normally means someone at home.
Are you an approved applicator?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and you’ll get one quote.
Window mastic in Borehamwood: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Wyllyotts Manor (about 4.3 miles north-east) nearby, there’s older building stock in the area around Borehamwood as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you let a flat or house near Elstree & Borehamwood station, renewing tired window mastic between tenants heads off draught and damp complaints. For site and facilities teams at buildings such as St Teresa Catholic Primary School, the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near All Saints church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Borehamwood is about 5 miles east of Watford, in Hertfordshire. If you need window mastic in Borehamwood, please call 0345 464 0079 or email us for a quick quote. We’re based in Crawley and cover Hertfordshire. Our area takes in 381 places across Hertfordshire, large and small. Our London page covers work nearby (14 miles or so).
Work in WD6 works the same way as everywhere else we cover. If you need window mastic at a property on Station Road, Canterbury Road and Eldon Avenue or anywhere close by, our applicators can take on the job. Being close to the A1 and A5135, Borehamwood is simple for us to get to for window mastic. Close by, we work in Well End (1 mile north-east), Green Street (1 mile north), Deacon's Hill (1 mile south), Rowley Green (1 mile east) and Elstree (2 miles south-west). Further out, we also cover Watford (5 miles west), Hemel Hempstead (10 miles north-west), St Albans (7 miles north), Welwyn Garden City (10 miles north), Harpenden (11 miles north) and Hoddesdon (13 miles north-east).
Landmarks near Borehamwood
Typical jobs here are in homes near Aldenham Country Park, The Pick & Shovel pub and Yavneh College and the streets around them. For rail, the closest station is Elstree & Borehamwood station, roughly 0.6 miles south-west. Nearby you will also find Royal National Orthopaedic Hospital (2.4 miles south-west) and Spires Shopping Centre (3.1 miles east). For a walk, there’s Darland's Lake and Rowley Lodge Field.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Towns and villages near Borehamwood
Also in Borehamwood
What sealant work cannot fix
We’d rather tell you now than do work that won’t last, so these are the limits:
- Draughts through the window seals rather than the frame
- A frame that has rotted at the joint
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, call 0345 464 0079 or email us and we will say what we think before you book.
Joints and surfaces we work on
- Aluminium frames
- Patio & French doors
- Composite doors
- uPVC windows
- Window sills
- Timber windows & doors
The process
There’s no need to move everything out before we come, just the space around the work. We protect the rest, and the job takes anything from an hour or two to a full day, depending on how many frames there are for a typical job. In Borehamwood, parking is rarely complicated, though it helps to know about driveways or restrictions, and let us know if the work is upstairs, in a flat or up high outside.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- Let us know about parking restrictions
- Mention any tricky access
- Keep children and pets away from the work area
Get a quote
Every job is quoted individually. Just call 0345 464 0079 or email us with the details, and photos are welcome.
Advice
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Walk round the house once a year and look at the joints
- Don’t aim a pressure washer at the joints
- Use gentle cleaners on frames and sealant
- Repaint timber before it’s bare
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early.
Leaks normally show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too. Several sites can be quoted together.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.