07940 077 994

01707 642 386

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Home extensions - all of the space, none of the hassle

Moving home can be a very draining experience — physically, emotionally and financially. A home extension, on the other hand, is a cost-effective building solution to free up some underutilised space and add a touch of elegance to your home. So if you are anywhere in Hertfordshire, contact us and take your first step towards that stunning extension.


With the kind of expertise we possess in the industry, you can be rest assured of our reliability when you engage our building services.

Home extensions made easy

• Single-storey extensions

• Double-storey extensions

• Garage extensions

• Conservatories

Call C J & Co Design & Build Ltd for top quality extensions and loft conversions.

07940 077 994

01707 642 386

A glimpse of our other services:

• Quality loft conversions

• Home refurbishments

• Shop and restaurant renovations

• Design and planning

Reliable new builds in Hertfordshire

Do you need expert help to design your dream home or office? We'll provide you impartial advice on best suited design ideas for your dream property. Get in touch with our dedicated team today.

What our customers are saying!

"C.J. And Co builders built our new porch in March 2005. From the outset, we were very comfortable with the whole project. The estimate was reasonable and the work was excellently carried out. Nothing was rushed and great care was taken with the finishing Costos was efficient and reliable and everyone who came to us, was friendly and helpful. Several other small jobs were undertaken and all together, our property has been greatly enhanced by their work. We warmly recommend Costos to you." — John and Angela Wright

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