Our Services

Our services include:

  • Window Hardware

  • Sash Window Servicing

  • Sash Window Replacements

  • Draught Proofing

  • Replacement Pulley Wheels and Sash Cords

  • Heritage Sash Window Replacements

  • Window Sill Repairs

Carpenter Keith Colthart is an expert in installing and maintaining double-hung timber sash windows. We pride ourselves with unmatched excellence backed by more than 35 years of experience and happy home owners right across Sydney.

All our work is guaranteed and carried out with a fine eye for detail.

The Angel Ventlock is the perfect unobtrusive window lock. It will not detract from the elegant style of your heritage windows. It offers safety and security and is so simple to use.

The unique lock fits flush into the sash so it does not hamper window furniture such as blinds, plantation shutters etc.

Learn about our services

Window Hardware

Supply & fitting of window locks and sash lifts

When it comes to window locks for timber sash windows, it’s important to consider safety and security as well as aesthetics. The unique Angel Ventlock system is child safe, secure and fully lockable. It comes in a range of colours and finishes to suit your home. We also sell and install lockable sash lifts.

Sash lifts are fitted to the bottom sash and therefore make them completely user friendly, particularly on large sashes where locks are out of reach for most.

Sash Window Servicing

This is our most popular service:

Draught Seal Reconditioning Service (Standard Service)

starting from $800 + GST

  • Remove existing window trims & glass window sashes

  • Clean & remove thickened existing paint from friction points on window

  • Check sashes & existing weights for counterbalance

  • Renew window sash cords x 4 and/or spiral balances x 4

  • Renew all window trims (Western Red Cedar): i.e., parting beads and staff beads with incorporated draught seals

  • Prime paint all exposed new timber

  • Check sashes run smoothly

  • Remove all waste from site

    *Added option to renew hardware

Draught Proofing

The Benefits of Draught Proofing

We fully recommend the installation of draught proofing to any timber sash window restoration. The draught proofing will eliminate draught, rattles and reduce outside noise, whilst keeping the traditional look of the windows.

Replacement Pulley Wheels & Sash Cords

These old pulley wheels have seized up and there is no movement in the wheel. This causes friction, eventually leading to fraying and thinning of the rope, causing it to break.

New Pulley Wheels:

  • No squeaky sound

  • No intermittent movement

  • Sash runs smoothly

  • Allows the rope to run with the wheel, not against it, causing no friction.

Heritage Sash Windows Replacements

Need your Heritage Windows restored or replaced?

We build and install heritage bespoke timber windows of all shapes and sizes including curved and detailed profiles. Most important to us,is the timber detail inside and out, to complete a perfect finish. We retain the distinctive charm of the window and offer a full range of heritage hardware. We also repair and install leadlight glass to suit. An added option is to install the Angel Ventlock to ensure your windows are safe and secure.

Window Sill Repairs

New Restoration of Casement Sashes and Sill,
Balmoral NSW

We will match the original profile of the sill and manufacture a complete copy when replacing a degraded sill.

Sash Window Replacements

Full Window Service starting from $2,300 + GST

 This service includes 2 x new Cedar Glazed Sashes (top and bottom). All new timber is prime painted. It is included with our Standard Service as below:

  •  Remove existing window trims & glass window sashes

  • Clean & remove thickened existing paint from friction points on window

  • Check sashes & existing weights for counterbalance

  • Renew window sash cords x 4 and/or spiral balances x 4

  • Renew all window trims (Western Red Cedar): i.e., parting beads and staff beads with incorporated draught seals

  • Prime paint all exposed new timber

  • Check sashes run smoothly

  • Remove all waste from site

 *Added option to renew hardware

 New sashes can also be priced separately. Please call for a quote.

 Complete replacement of double hung window - price quoted on site.

Lockable Angel Ventlocks

Lockable Sash Lifts

  • "Keith was a very professional carpenter and a nice bloke. I have no hesitation in recommending him. Excellent job!"

    Brian – Kareela

  • "Keith was a pleasure to deal with. He spends the time to do a job properly. We are very pleased with our new doors and frame. They look like they were always there. He was on time and listens well to your needs. Would highly recommend him."

    Cass - Marrickville

  • "Keith did a great job installing our sash window locks. Keith was personable and really great to work with. He was passionate, polished and very professional. I would recommend his service to others."

    Simon - Mosman - May 2020

  • "Keith Colthart, proved to be an excellent choice to undertake the precision installation of two arched doors at our historic church. Keith is a craftsman who takes pride in his work, not content unless everything fits and operates perfectly. Old deep hardwood jambs had to be removed, new ones installed and the doors needed to be hung. Keith attended to the detail required to get the hinged arched doors to swing smoothly and precisely: a complex procedure. Keith returned to do final adjustments to ensure a perfect fit. I am very pleased to recommend him."

    Ken - St Luke's Anglican Church Burwood - April 2020

  • "Thanks very much for repairing our 1964 sash windows. I was impressed, that you provided a quote right away, that you arrived on site when you said you would, you repaired the windows efficiently, and cleaned up afterwards. These days that is a rare trait of "tradies". I won't hesitate in contacting you next time we need some work done. Thanks again."

    Michael - Forestville - March 2020

  • “Keith Colthart Carpentry completed a fantastic job repairing broken window fittings for our school. Keith kindly rearranged his work schedule to complete this urgent job due to weather and security concerns and not being able to operate the classroom windows. Keith was very helpful and professional in his dealings with us. I would thoroughly recommend Keith Colthart Carpentry for window repairs."

    Paul - Randwick - March 2020

  • “Great customer service - honest and thorough along with a great product - sash window locks. A definite recommendation from me. Thanks Keith.”

    Nick - Roseville - January 2020

  • “We just wanted to say thank you for the great job you did yesterday. We came home to find beautifully installed locks that function exactly as you said they would, with no damage to any of the existing windows and no mess! And as simple as this sounds it's not something that gets done right by tradespeople very often. I know you have the top floor apartments to complete in the coming weeks and I'm sure our neighbours will be just as happy as we are when it's all done. Apologies again for taking so long to get organised on our side, but it was well worth the wait."

    Julia & Luke - Mosman

  • “Keith serviced our sash windows and installed child safety locks. He was friendly, thorough and took great care to respect the heritage nature of our building and help us select discreet locks. Love your work Keith!"

    Annika - Manly

  • “Have had window locks fitted on our Strata Building. So glad we chose the Angel Ventlocks. They really compliment our sash windows. Thanks Keith.”

    Anne – Mosman

  • “Keith is honest, efficient, with obvious expertise and experience. He was a pleasure to do business with. I recommend him and will hire him again.”

    Virginia – Annandale

  • "We had The Small Sash Window Company come to service our timber sash windows. We also had their window locks fitted. We had never seen these before, but we were very impressed with the functionality. We were lucky to find this company and they continue to work with us."

    Facilities Manager MLC School Burwood

  • "We needed window locks fitted for safety and to enable ventilation for the wellbeing of our students. The Small Sash Window Company installed their window locks, and we were very happy with the outcome. They look great and are simple to use."

    Sutherland Public School

  • "As a strata body corporate as well as an apartment owner, I have worked with Keith to maintain and upgrade our sash windows. His Angel Ventlocks have elevated window safety in an innovative way, while maintaining a high-end look and handling. His approach to draught sealing and maintaining older windows has ensured great functionality without compromising their visual appearance. Keith excels with an attention to detail and a quality of work that is hard to come by; I'd work with him any time again."

    Hendrik, Sydney