Who Makes Bespoke Wooden Sash Windows in Cornwall?
If you're looking for bespoke wooden sash windows in Cornwall, the important thing is to find a joinery manufacturer that actually makes the windows around your property rather than adapting standard-sized frames.
A genuinely bespoke sash window starts with your measured opening, not a catalogue dimension.
This becomes particularly important with older Cornish properties. Stonework moves, openings aren't always square, original mouldings vary and two windows that appear identical from the road can be surprisingly different when they're properly measured.
At Wood.ED Joinery, we manufacture bespoke timber sash windows from our workshop in Perranporth, Cornwall. We work on period properties, renovations, listed and heritage buildings, as well as homes where the owner simply wants a traditional timber window manufactured properly for the opening.
The important question isn't simply “Who makes wooden sash windows in Cornwall?”
It's “What am I actually getting for my money?”
Table of Contents
What Does Bespoke Actually Mean for a Wooden Sash Window?
The word bespoke gets used rather loosely.
For us, it means the window is designed and manufactured specifically for the property and opening where it will eventually be installed.
We aren't simply choosing the nearest available standard size and filling the remaining space with packers and trims.
A sash window has numerous details that can be adjusted individually, including:
Overall frame dimensions
Frame depth
Sash dimensions
Glazing bar width
Meeting rail proportions
Moulding profiles
Sash horns
Cill projection
Glazing specification
Draught seals
Ironmongery
Balance system
This becomes especially important when replacing only one or two windows in a property.
If the new window sits beside an original, small differences in glazing bars, meeting rails and frame proportions can become surprisingly noticeable.
How Are Bespoke Sash Windows Measured?
Good window manufacture starts before any timber reaches a machine.
It starts at the property.
We don't assume an opening is square simply because it looks square.
Measurements should be taken at several positions, including:
Width at the head
Width through the centre
Width at the cill
Height on both sides
Diagonal measurements
Reveal depth
Cill position
Surrounding masonry
Older stone buildings can vary considerably.
We've encountered openings where the difference between measurements is well over 10mm. Trying to force one standard-sized frame into an opening like that can result in excessive packing, oversized trims or inconsistent sightlines.
The manufacturing dimensions need to account for the building as it actually exists.
That's one of the biggest differences between standard and genuinely bespoke joinery.
Traditional Weights and Cords or Spring Balances?
There are two common ways of balancing a modern sliding sash window.
Traditional weights and cords
Traditional box sash windows use cords running over pulleys to connect the moving sash to counterweights concealed within the sides of the frame.
When correctly calculated, the weights counterbalance the glass and timber, allowing the sash to move easily.
It's an extremely simple system and one we particularly like.
Cords, pulleys and weights can all be accessed and serviced individually.
Spring balances
Spring-balanced sash windows use concealed balance mechanisms rather than traditional weights.
Because large weight boxes aren't required, the overall frame can sometimes be made slimmer.
They can therefore be useful where space is restricted.
However, we don't automatically specify spring balances simply because they're modern.
On exposed coastal properties, we consider whether a traditional cord-and-weight system might provide better long-term serviceability.
The correct choice depends on the property rather than one system being universally better than the other.
What Timber Should Be Used for Sash Windows?
There isn't one timber that's right for every sash window.
We consider:
Exposure
Finish
Stability
Durability
Appearance
Maintenance
Existing joinery
For many painted external windows, Accoya is particularly useful because of its dimensional stability.
That matters with sliding sash windows.
The moving sashes need controlled clearances within the frame. Excessive timber movement can cause a sash to bind during damp periods or create unnecessary gaps as conditions change.
Suitable hardwoods can also be used depending on the project.
Timber species is only one part of the equation, though.
A durable piece of timber won't compensate for poor drainage, badly designed joints, unsuitable glazing or incorrect installation.
Can Wooden Sash Windows Be Double Glazed?
Yes.
Modern timber sash windows can incorporate double glazing while maintaining traditional proportions.
The important part is designing the sash around the glazing rather than simply trying to fit thicker glass into a traditional section.
Double-glazed units weigh considerably more than traditional single glazing.
That affects:
Sash weight
Counterweights
Glazing rebates
Timber sections
Balance mechanisms
Overall operation
For some period and heritage projects, slim double-glazed units can help maintain narrower glazing bars and more traditional sightlines.
The glass, timber and balancing system therefore need to be considered together.
Can New Sash Windows Match My Existing Windows?
Yes, and this is one of the areas where bespoke manufacturing becomes particularly valuable.
Where suitable original windows remain, we can record details such as:
Glazing bars
Moulding profiles
Meeting rails
Sash horns
Staff beads
Parting beads
Frame sections
Cill details
We can then manufacture replacement joinery that follows those proportions.
This doesn't necessarily mean blindly copying every detail.
An older replacement window may itself have been poorly proportioned or incorrectly altered over the years.
Where original joinery survives elsewhere on the property, that's often a better reference.
Replacing Sash Windows One at a Time
You don't necessarily have to replace every window simultaneously.
If four windows are deteriorating but six remain perfectly serviceable, replacing the four first can be entirely sensible.
The important thing is establishing the specification from the beginning.
We can record the timber, profiles, glazing bars, glass, ironmongery and finish so later windows can follow the same design.
For prominent elevations, replacing all the windows visible together may provide better visual consistency.
Elsewhere, phased replacement can make a larger project considerably easier to manage.
What Should I Compare When Getting Sash Window Quotations?
Don't compare quotations using the final figure alone.
Two quotes describing a “bespoke timber sash window” can actually be specifying very different products.
Ask each manufacturer:
What timber are you quoting?
Is every window individually measured and manufactured?
Will existing mouldings and glazing bars be matched?
What glazing specification is included?
Are traditional weights and cords or spring balances being used?
What draught-proofing system is included?
What paint or coating system is specified?
What ironmongery is included?
Does the price include a site survey?
Does it include installation?
Is removal of the existing window included?
Who is responsible for making good around the opening?
This makes quotation comparison much more meaningful.
If one quotation is significantly cheaper, look carefully at the specification before assuming it's better value.
The timber, glazing, finish, installation and amount of work included may be different.
Do I Need Permission to Replace Sash Windows in Cornwall?
Sometimes.
It depends on the property and the work being proposed.
Listed buildings
Alterations affecting the character of a listed building can require Listed Building Consent.
Windows are often particularly important because their material, proportions, glazing bars and construction contribute to the architectural character of the building.
Don't order replacement windows for a listed property and investigate consent afterwards.
Establish what's required first.
Conservation areas
Being within a conservation area doesn't automatically mean every window replacement requires permission.
However, additional planning controls can apply, particularly where permitted development rights have been restricted or the proposed replacement materially changes the appearance of the building.
If you're uncertain, check with the relevant local planning authority before manufacture begins.
For heritage projects, having accurate drawings and a clear specification of the proposed window can also make discussions considerably easier.
How Much Do Bespoke Wooden Sash Windows Cost?
There isn't a useful single price for a bespoke sash window because specifications vary too much.
Cost is influenced by:
Overall size
Timber
Number of glazing bars
Glazing specification
Weighted or spring-balanced construction
Mouldings
Decorative glass
Ironmongery
Paint finish
Installation
Access
Condition of the existing opening
An arched Accoya box sash with specialist glazing and replicated mouldings isn't comparable with a small rectangular softwood sash.
That's why we prefer to price around an actual specification rather than publish a figure that may have little relevance to the property.
How Long Do Bespoke Sash Windows Take to Manufacture?
Bespoke joinery is normally measured in weeks rather than days.
he process can include:
Survey → design → timber preparation → machining → assembly → glazing → finishing → installation
Straightforward windows can move through this process more quickly than complicated heritage work.
Matching unusual mouldings, producing curved components, incorporating decorative glass or manufacturing large numbers of windows can increase the programme.
When comparing manufacturers, ask when the quoted lead time actually starts.
Is it from:
Initial enquiry?
Deposit?
Final measurement?
Drawing approval?
That distinction can make a considerable difference.
Are Wooden Sash Windows Suitable for Coastal Properties?
Yes, but the specification needs to reflect the environment.
We manufacture in Cornwall, so coastal exposure is something we regularly consider.
A window overlooking the Atlantic can experience considerably more:
Wind-driven rain
Salt
UV exposure
Moisture variation
Wind pressure
than a similar window on a sheltered inland property.
For exposed locations we pay particular attention to timber stability, coatings, drainage, glazing systems, weather seals and corrosion-resistant hardware.
We also consider the balance mechanism.
Traditional sash weights are concealed inside the box and the individual components are straightforward to maintain. In some exposed locations, we prefer that simplicity to unnecessarily complicated concealed mechanisms.
How Do You Maintain Wooden Sash Windows?
Modern timber sash windows shouldn't require constant maintenance.
They do need occasional inspection.
Once or twice a year, check:
External cills
Bottom sash rails
Paint around joints
Glazing
Sash cords
Pulleys
Weather seals
Drainage areas
Coastal properties deserve particularly close attention.
Salt deposits should be cleaned away periodically, especially from hardware and exposed surfaces.
Most importantly, don't wait until paint has completely failed before doing anything.
A small coating defect is straightforward to repair.
Once water repeatedly reaches unprotected timber underneath, the repair becomes more involved.
Can Sash Windows Be Repaired Instead of Replaced?
Often, yes.
Old doesn't automatically mean worn out.
A traditional sash window may have survived for many decades while only a relatively small part has deteriorated.
Depending on its condition, repairs can include:
New sash cords
Pulley servicing
Counterweight adjustment
Draught-proofing
New staff or parting beads
Localised timber repairs
Cill replacement
Bottom rail repairs
Reglazing
Repainting
For period properties, retaining sound original material can be preferable to automatically replacing everything.
We therefore think the first question should be:
What condition is the existing window actually in?
Only then does it make sense to decide whether repair or replacement is the better approach.
What Makes a Good Bespoke Sash Window?
It isn't one expensive component.
It's how all the details work together.
The opening needs to be measured correctly. The timber needs to suit the environment. The joints need to remain stable. The glass has to be supported correctly. The weights need to balance the sashes. The seals need to control draughts without preventing movement, and the frame needs to manage rain rather than trap it.
Installation then has to preserve all that accuracy.
That's why our definition of bespoke is quite simple:
We start with the building and manufacture the window around it—not the other way around.
Frequently Asked Questions
Who makes bespoke wooden sash windows in Cornwall?
Wood.ED Joinery manufactures bespoke timber sash windows from our workshop in Perranporth, Cornwall. We manufacture traditional weighted box sash windows as well as spring-balanced designs where appropriate, working across Cornwall and Devon.
Can you copy my original sash windows?
Yes. Where suitable original joinery survives, we can measure and reproduce glazing bars, mouldings, meeting rails, sash horns and other important details.
Can you manufacture just one sash window?
Yes. Because our windows are individually manufactured, we can produce a single replacement or manufacture windows gradually as part of a phased project.
Can sash windows have double glazing?
Yes. Modern timber sash windows can incorporate double glazing. The sash sections and balance system need to be designed around the additional weight of the glass.
Do you manufacture traditional sash windows with weights and cords?
Yes. We manufacture traditional cord-and-weight sash windows using pulleys and concealed counterweights. We also manufacture spring-balanced windows where that system better suits the project.
What timber do you recommend for coastal sash windows?
The specification depends on exposure and finish, but dimensional stability is particularly important. Accoya is one material we regularly consider for painted external joinery in demanding coastal locations.
Do sash windows need a lot of maintenance?
Not if they're manufactured, finished and installed correctly. Regular inspection, cleaning and dealing with coating damage before bare timber becomes exposed can substantially reduce future repair work.
Should I repair or replace my old sash windows?
That depends on their condition. Broken cords, draughts and localised timber decay don't automatically justify complete replacement. If the main frame and joints remain sound, repair may be the more appropriate option.
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