Hertfordshire · England
Window & door mastic in Pimlico, Hertfordshire
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Pimlico. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Mastic that’s falling out in pieces
- Rain getting in at the frame or under the sill
- White mastic on grey or black frames
Leave it or put it right?
The work is quick compared with the damage it prevents: it takes most of a day for a typical house, less for a few frames. Leave it until water is coming in and you may need plastering and decorating as well. Around Pimlico, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will go through it with you.
Why choose Mr Mastic in Pimlico
- We are fully insured
- Trusted Arbo and Everbuild sealants
- Sanitary silicone with an anti-fungal additive in wet areas
- Every job guaranteed for a year
Read what affects the cost and our reviews.
How we handle window mastic in Pimlico
Some gaps around frames are far deeper than they look. Filling it with sealant alone leaves a joint that can’t move properly, so we fit backing rod to set the right depth. That way the new bead bonds to the frame and the wall only. Typical jobs include mastic that’s falling out in pieces and white mastic on grey or black frames, across timber windows & doors, aluminium frames and composite doors.
Somewhere as small as Pimlico, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
Big or small, you get the same one-year guarantee in Pimlico and across Hertfordshire.
- Where
- Pimlico (HP3)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Also near Pimlico
Other services in Pimlico
Aftercare tips
How long the joints last depends on use and care. We suggest:
- Air rooms to keep condensation down around windows
- Keep jet washers away from the mastic
- Keep paint off silicone joints
- Wash the frames with mild soapy water
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
What we can’t put right
We won’t take on work that won’t last, so these are the limits:
- Broken hinges, locks or handles
- Condensation trapped between the panes
- A frame that has rotted at the joint
If in doubt, call 0345 464 0079 or email us and we’ll say what we think.
What we seal
- Aluminium frames
- Patio & French doors
- Timber windows & doors
- Window sills
- uPVC windows
- Composite doors
What happens on the day
We keep the work tidy and contained to the area we are working on, so you can get on with your day. Expect the work to take a morning for a couple of windows and a door. In a small place like Pimlico, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
How to prepare
- Let us know about earlier repairs to the joints
- Try not to wet indoor joints just before the visit
- Mention any tricky access
Ask for a quote
Need a quote? Please ring 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Advice
Surface by surface
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the threshold joint takes a lot of water. We prepare and reseal every joint, backing the deep ones.
Composite doors
Front doors take the weather head on. We pay most attention there.
DIY sealant or a professional job?
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.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
What we are called out for in Pimlico
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
The problems people usually mention when they call include:
- Cracked internal joints between frame and plaster
- Damp patches on the reveal after heavy rain
- Whistling draughts around closed windows
- Mastic that’s falling out in pieces
If you look after a building such as Bedmond Academy, larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- What the cure time is
- Is VAT in the price?
- Whether they seal over old material or remove it
- Are they insured?
Pimlico: your questions answered
Can you do window mastic in Pimlico?
Yes, Pimlico is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job.
Do you cover smaller places like Pimlico?
Yes, Pimlico is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
I rent my home. Can I book you?
Of course. Check with your landlord; we can send the quote to them too.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
How long does it take to reseal the windows on a house?
A few frames take a few hours, while a whole house takes longer. We confirm the timing with your quote.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. We can talk about working times when we quote.
How do I get a quote for window mastic in Pimlico?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote and we will talk you through it.
What window mastic looks like in Pimlico
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as High Elms Manor (about 2.2 miles south-east) nearby, there’s older building stock in the area around Pimlico as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Kings Langley station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you live in an older home near Church of the Ascension, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Pimlico is about 2 miles south-east of Hemel Hempstead, in Hertfordshire. For window mastic in and around Pimlico, it’s easy to get a quote: please ring 0345 464 0079 or email us. We’re based in Crawley and cover Hertfordshire, Pimlico included. Pimlico is one of 381 places in Hertfordshire where we work for window mastic. For nearby work, see our London page, about 21 miles away.
Work in HP3 is quoted and booked the same way as anywhere else. That includes homes and businesses on Bedmond Road and Hyde Lane. If you’re just outside Pimlico, we cover Bedmond (1 mile south), Westwick Row (1 mile north), Nash Mills (2 miles west), Leverstock Green (2 miles north-west) and Bennetts End (2 miles north-west). Further out, we also cover Watford (5 miles south), St Albans (4 miles east), Welwyn Garden City (11 miles north-east), Harpenden (7 miles north-east), Hatfield (8 miles east) and Hertford (15 miles east).
What’s near Pimlico
We work in homes and buildings around The Swan Public House and Longdean School and the streets around them. The nearest railway station is Kings Langley station, about 1.9 miles south-west. Nearby you will also find Village Arcade St Albans (3.5 miles north-east) and Hypocaust Museum (2.9 miles north-east). Not far away are Verulamium Lake and Longspring Wood.