Key Product Features
Our extensions are perfect for growing families or upgrading existing homes. These precision engineered extensions are warm and welcoming throughout the year by providing additional space.
Choose between various designs to add thermal performance and regulation approved security features. Combining easy installation of windows and glazing, our masonry piers can be used to improve thermal comfort and complete the overall appearance of your extension.
Working closely with Ultraframe, we can use and install a selection of their high quality extension designs. Choose from flat roof, Livinroof or Ultraroof designs to find and tailor to meet your tastes and needs.
Using these designs as bases, you can upgrade your extension by changing windows, doors, glazing designs, hardware and locking systems. Alternatively, opt in for blinds, light and speaker systems or underfloor heating. For product photographs of our installed extensions, view our product gallery.VISIT OUR GALLERY
About KJM Group
Since 1983, KJM has been working in the Andover and Hampshire areas to provide excellent customer service and home improvement installations. With 40 years of trading history, our extensions are installed with high quality materials and years of experience.
Our partnership with Ultraframe and our Which? and Checkatrade accreditations are examples of our open, honest and personalised customer service. To find out more about our business values, visit our about page for more information.LEARN MORE
Extension Prices Andover & Hampshire
Use our quotation engine today to view extension prices based on size and location. We strive to provide customisability to our products as well as our extensions. Choose the glazing, windows and doors which best suit your design specifications in the Andover and Hampshire areas.
You can find the appearance that matches or compliments your existing property with our various colours, hardware and finishes. To receive a bespoke quote which meets the upgrades and additions you are looking for on our extensions, fill out our contact form for a response as soon as possible.
Frequently Asked Questions
How thermally efficient are extensions?
Our extensions are built to offer energy efficiency ratings of up to ‘A++’ while lowering the U-values of your property in the Andover and Hampshire areas. Being thermally efficient at standard, you can add masonry piers and insulated columns or use the Ultraroof design to boost your extension’s performance further.
What types of extensions are available?
By choosing to work with Ultraframe, we can offer a variety of roofs in addition to our extension design. Use our flat roof extension for a frameless contemporary design. Alternatively, use our Livinroof for the combined benefits of traditional glass and solid conservatory roofs. Finally, choose to use our Ultraroof design to boost thermal technology.
How long are extensions built to last for?
Using designs manufactured and created to last, our extensions have been vigorously tested for customer satisfaction. Combining regular low maintenance cleaning and additions such as self cleaning glass, our house extensions can last for years, even at standard design.
What glazing types are available for extensions?
With the design specification of full or partial glass on our extensions, you can customise the glazing to meet your needs. Choose between double or triple glazing for increased thermal performance. Also, choose between designs that provide privacy or remove sightlines to your extension.
How much does a house extension cost?
Our house extensions can vary in cost depending on a variety of factors. Use our quotation engine for a standard price based on size and location. Alternatively, if you are looking to upgrade features such as windows, doors, glazing, and roof design, fill out our contact form for a bespoke quote today.
How secure are extensions?
At standard, our extensions are designed to provide security and peace of mind after installation. You can feel safe and comfortable in your home by installing multi-point locks into our doors and shoot bolt locking mechanisms into our windows. Alternatively, opt for different locking systems for additional benefits and security protection.