Window sash replacement &
retrofit double glazing

Window sash replacement & retrofit double glazing

Adrian Harris Woodcraft is your go-to sash window company for both window sash replacement and retrofit double-glazing. Christchurch-based with a workshop in Wigram, Mark and Adrian are Master Craftsmen and valued renovation specialists for timber window sash projects.

Window sash services

Sash window repairs

Sash windows with their timeless charm, can succumb to various challenges over time, such as damage and warping from storms or strong winds, and rot Sash window repairs preserve a home’s character. Replacing the damaged or rotten sash in the existing frame is popular because it’s much less work than installing a whole window frame. 

Replacement & Retrofit double glazing

Retrofit double glazing of timber sash windows provides improved insulation and enhanced energy efficiency. Retrofit double-glazing for the whole house adds appeal for resale and helps to meet healthy home standards. 

Types of window sash

Side hung window sash/casement

Top hung/awning 

Double Hung window sash 

Retrofit double glazing: restoration vs replacement

Retrofitting double glazed timber windows by replacing the whole sash eliminates the problem of joints breaking. When the original sash is modified to take to double glazing the joints are cut away and twice the weight of glass is added. This often leads to joint failure.

About Adrian Harris Woodcraft

Window sash company

Building on a combined 60 years in the wood working industry, the dynamic duo behind the joinery craftsmanship are owners Mark and Adrian. Applying skills and experience drawn from furniture making, as a boat fitter, and creating luxury cedar hot tubs, Mark and Adrian craft high-end, bespoke exterior timber joinery for windows and doors. They have earned a reputation as preferred joiners for discerning builders and local home-owners looking for accuracy and honesty.


Adrian Harris Master Joiner

Steps to window sash repairs/retrofit double glazing 


Approx Measure & quote

Supply us with rough measurements for a quote. Advise if replacing like for like (single) or wanting double glazed for better insulation.


Precise measure

Once the quote is approved, our builder (or yours) takes exact measurements. The old sash can be supplied to copy.



We will craft your windows to your requirements.


Pickup or delivery & installation

Builders typically pick up the windows unprimed. For home owners, we usually get our installer to deliver, prime & install the window(s). Top coating if required.

Contact Adrian Harris Woodcraft

Unit J, 3 Timothy Place,
Christchurch, NZ
Call:(+64) (3) 348 6996

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