Milton Keynes · England
Great Horwood Window Mastic
Window and door frames in Great Horwood need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Leaking joints at the ends of sills
- Mastic that has split away from the wall
- Gaps left after new windows were fitted
How the visit works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take a few hours for a handful of frames, longer for a whole house. Somewhere like Great Horwood needs a little journey planning: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Tell us about any water getting in
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about earlier repairs to the joints
Getting a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, call 0345 464 0079 or email us.
Related advice
Window mastic in Great Horwood, done properly
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. We work on patio & French doors, timber windows & doors and composite doors, and people most often call us about a bead that doesn’t match the frame and hard, cracked sealant around windows.
Mastic can only go onto a dry, clean joint, so window work in Great Horwood is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
All our work is covered by a 12-month guarantee.
- Place
- Great Horwood (MK17)
- Wider area
- Milton Keynes
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What we’re called out for in Great Horwood
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. A sealant that cannot keep up eventually tears.
Any of these means the joints need attention:
- Mastic that is falling out in pieces
- White mastic on grey or black frames
- Draughty joints inside around the window
- Draughts coming in around windows and doors
If you live in an older home near Church of St James, the joint between an old wall and a newer frame is generally the first place rain gets in.
Before booking anyone
- Whether they seal over old material or remove it
- Whether the sealant suits the joint
- Whether VAT is included
- What guarantee comes with the work
How the job changes by surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. We match white, brown, anthracite grey and black frames.
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. Those corners get the most care.
Frames and glazing around Great Horwood
Rainfall in the South East is lower than in much 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 Claydon House (about 4.9 miles south-west) nearby, there’s older building stock in the area around Great Horwood as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
If you look after a building such as Great Horwood Church of England School, its window and door frames need their mastic kept sound, just like a home’s.
Great Horwood is about 5 miles east of Buckingham, in Milton Keynes. Our applicators cover window mastic for homeowners, landlords and businesses in Great Horwood and nearby. Great Horwood is one of 73 places in Milton Keynes where we work. For nearby work, see our Oxford page.
Every address in MK17 is within our area for window mastic, from the main roads to the quietest streets. If you need window mastic at a property on High Street, The Green and Willow Road or a nearby road, our applicators can take on the job. We also cover Little Horwood (1 mile east), Nash (2 miles north), Winslow (2 miles south), Whaddon (3 miles north-east) and Swanbourne (3 miles south-east). Larger places within reach include Milton Keynes (6 miles north-east), Bletchley (6 miles east), Newport Pagnell (10 miles north-east), Bletchley and Fenny Stratford (7 miles east), Furzton (5 miles north-east) and Whitehouse (5 miles north-east).
Near you in Great Horwood
Typical jobs here are in homes near Sir Thomas Fremantle School and The Crown pub, among other places. Other landmarks nearby include Buckingham Community Hospital (5 miles north-west) and Drayton Parslow Mound (4.2 miles south-east). Not far away are Buckingham Sand Pit.
Looking after it afterwards
After the cure time, these simple habits help:
- Do not use solvent cleaners on the joint
- Keep drainage slots and sill grooves clear
- Paint up to the joint, not over it
- Repaint timber before it’s bare
Most silicone sealants will not take paint, so mention any painting plans before we start. We can use a paintable sealant where that matters.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Towns and villages near Great Horwood
Also in Great Horwood
Your questions about window mastic in Great Horwood
Is window mastic in Great Horwood guaranteed?
All our work, in Great Horwood and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Can you do window mastic in Great Horwood?
Yes. We work across London and the South East, and Great Horwood is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Can new window sealant be painted?
Not generally, if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Do you hold any approvals?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Do you have sealant for grey or black windows?
Yes, in most cases. Mention the frame colour when you ask for a quote and we’ll use the nearest match.
Do you have insurance?
Yes. We’re fully insured, and we have been doing sealant work for more than 20 years.
Should I try DIY first?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Will resealing my frames help with draughts?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we will tell you.
Landlord and commercial work in Great Horwood
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for.
What affects the quote in Great Horwood
For a quick quote, just ask. The main things that affect it are:
- How many rooms, windows or areas are involved
- The amount of work
- Whether the work is at height
- The product the joint needs
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, call 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Helping us quote
When you call or email, these details help:
- Photos by email, if that is easy
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. When it suits you, ring 0345 464 0079 or drop us an email.