Hertfordshire · England
Window Mastic in Graveley
We cover Graveley for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly.
- Draughts coming in around windows and doors
- Hard, cracked sealant around windows
- Untidy mastic left by window fitters
Window mastic in Graveley, done properly
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. Common call-outs are for gaps between the frame and the inside reveal and leaking joints at the ends of sills, across aluminium frames, window sills and composite doors.
Outdoor sealant needs dry, clean surfaces, so work on frames around Graveley is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Graveley (SG4)
- Wider area
- Hertfordshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What the job involves on each surface
Composite doors
Draughts round the door leaf normally come from worn seals or adjustment, not the mastic. We will tell you if that’s what we find.
Window sills
Masonry sills can have joints where water gets in, and the joint under the frame can let rain run behind. We seal those with a sealant suited to masonry.
DIY sealant or a professional job?
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.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
What happens if it’s left?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. In a small place like Graveley, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first.
Why us?
- Trusted Arbo and Everbuild sealants
- 180+ five-star Google reviews
- Fully insured
- We never seal over old sealant
How it works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. Most jobs take a morning for a couple of windows and a door. In a small place like Graveley, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- 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.
Getting ready for the visit
- Tell us about any water getting in
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
Ask for a quote
We quote each job on its own, so start by telling us what you need. Simply ring 0345 464 0079 or email us and describe the job, and pictures are welcome.
Advice
Windows and doors in Graveley
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Knebworth House (about 4.4 miles south) nearby, there’s older building stock in the area around Graveley as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
For landlords with property near Stevenage station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Homes close to Church of St Mary include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Graveley is about 2 miles north-west of Stevenage, in Hertfordshire. Our applicators cover window mastic for homeowners, landlords and businesses in Graveley and nearby. Across Hertfordshire, we cover 381 places, Graveley among them. We also work in London, around 31 miles away.
Our applicators cover all of the SG4 postcode area for window mastic and the streets around it. If you need window mastic at a property on High Street, Oak Lane and Ashwell Close or a nearby road, our applicators can take on the job. If you’re just outside Graveley, we cover Todd's Green (1 mile south-west), Great Wymondley (1 mile north-west), Little Wymondley (1 mile west), Titmore Green (1 mile south-west) and Lower Titmore Green (1 mile south-west). Within a short drive, we also cover St Albans (14 miles south), Welwyn Garden City (10 miles south), Harpenden (10 miles south-west), Hitchin (3 miles west), Hoddesdon (15 miles south-east) and Hatfield (12 miles south).
Landmarks near Graveley
Typical jobs here are in homes near Waggon And Horses Public House, Church of Saint Nicholas and The John Henry Newman School and the streets around them. The nearest railway station is Stevenage station, roughly 2.4 miles south. Other landmarks nearby include Wymondley Castle (1.1 miles west) and Stevenage Museum (2.4 miles south). Not far away are Purwell Ninesprings.
What affects the cost of window mastic
Your quote is based on your job. We look at:
- The product the joint needs
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- Whether there’s mould to deal with
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Asking for a quote
When you call or email, these details help:
- Roughly how big the job is
- Access, such as stairs, a lift or height
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To get started, call 0345 464 0079 or email us.
Looking after it afterwards
After the cure time, these simple habits help:
- Repaint timber before it’s bare
- Look round the frames every year or so
- Clear any debris from frame drain holes
- Wash the frames with mild soapy water
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
Draughts get worse, not better. As the old mastic shrinks further, more air gets through, and heat escapes around the frame. Resealing closes it.
Nearby places to Graveley
What else we do in Graveley
Your questions about window mastic in Graveley
Is Graveley within the area you cover?
Yes, Graveley is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Stevenage station?
Yes. We work for letting agents and landlords as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.
Can you get sealant to suit coloured frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames generally suit brown.
Do you guarantee window mastic?
Yes, for 12 months. A yearly look at the joints helps them last.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we are using and why.
Can you seal the gap between the frame and the plaster indoors?
Yes. Indoors, we seal between the frame and the plaster or reveal.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Signs you need window mastic in Graveley
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. A sealant that can’t keep up eventually tears.
Common reasons people contact us include:
- Draughts coming in around windows and doors
- Leaking joints at the ends of sills
- Rushed sealant from a window installation
- Mastic that has split away from the wall
For site and facilities teams at buildings such as Graveley Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before booking
- Whether all the old sealant comes out first
- Whether the sealant suits the joint
- The length of the guarantee
- Whether you can choose the colour