Energy Efficient Designs for Extensions

Jigsaw • 2 November 2022

Home extensions are an attractive idea: they add space and value, plus often improve the look of a place. But a bigger home means more space to heat, which could increase costs and CO2 emissions.

Building regulations stipulate that you must include certain energy efficiency measures when extending, such as:

- insulating cavities and floors (plus lofts if you have one)

- making provisions for low-energy lighting wherever possible

- installing thermostatic valves on any new radiators.

As the homeowner, it’s your responsibility to comply, so you should always confirm with builders at the start that they’ll handle the calculations on your behalf.

Some tips to improve energy efficiency in your home are as follows:

Use cavity concrete or breeze blocks for exterior walls instead of regular bricks

With cavity concrete or breeze blocks, you can use external wall insulation to provide the best possible insulation. Whilst the initial outlay may be higher, you could save up to 40% on your energy bills. A good, flexible render will form a long-lasting, weatherproof coating to keep walls protected against the elements.

Insulate under floors and / or use underfloor heating

Using PIR (foam) insulation under flooring, also helps improve heat retention. Insulate a solid floor with PIR board to improve the thermal mass. The floor will absorb heat and retain it, keeping your home at a comfortable temperature rather than letting heating leak down into the ground.

Underfloor heating can avoid the need for wall hung radiators and save 15-50% on your heating bills as it spreads heat more evenly and can be set at a lower temperature.

Upgrade your boiler

With the transition away from fossil fuels gathering pace, this could be the time to look at whether renewable heat is right for your home. Alternatively, if you decide to upgrade your boiler, aim for the most energy efficient model. Installing a thermostat, programmer and thermostatic radiator valves could save you £75 a year on fuel bills and help to control the amount of heat you need.

Place furniture away from radiators

If you don’t want underfloor heating, avoid placing furniture in front of radiators as they absorb a lot of heat.

Windows should be double-glazed

Of course, we all know using double glazed windows instead of single reduces heat loss. You can check U-values of glass to measure the heat loss through a window- the lower the U-value, the better the thermal performance.

Use energy efficient lighting

LED lights use 90% less electricity than regular bulbs. LED lamps also have a much longer lifespan than Compact Fluorescent Lamps (CFL), so, whilst they may cost more initially, they are durable and eco-friendly. You can see which the best performing LEDs here .

Where possible, keep costs down by taking advantage of natural light. You can install skylights or large glass doors which look great.

Block any draughts

Draught-proofing is one of the cheapest and most effective ways to save energy – and money – in any type of building.

Controlled ventilation helps reduce condensation and damp, by letting fresh air in when needed. However, draughts are uncontrolled: they let in too much cold air and waste too much heat. To draught-proof your home, you should block up unwanted gaps that let cold air in and warm air out.

Think about the rest of the property

However, well insulated your extension is, adding it to a poorly insulated home will not make it cheaper to run overnight and you should consider looking to improve the efficiency of the main property while the design is in progress. Even if you can’t make all the changes suggested, a few could make a big difference.

For more information and advice on how Jigsaw Property Maintenance can project manage your reconfiguration from start to finish, get in touch , hello@jcs-ltd.co.uk

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by Lisa Woolnough 3 September 2025
Planning a home extension in Surrey , a loft conversion , or even a new build? One of the biggest early considerations is whether you’ll need planning permission . For many homeowners, the process can seem confusing—but with the right knowledge and an experienced Surrey construction company by your side, it becomes much simpler. At Jigsaw Construction Surrey , we’ve supported countless homeowners through planning applications, helping them move smoothly from paperwork to building work. Here’s our step-by-step guide to navigating planning permission in Surrey. Step 1: Do You Need Planning Permission in Surrey? Not all building projects require formal approval. Some fall under Permitted Development Rights (PDR), which may allow you to extend or convert your home without submitting a full application. However, in Surrey, these rights can be restricted if your property is: Within a conservation area A listed building Situated in the Green Belt 👉 Before starting your project, check with your local Surrey council or ask our team at Jigsaw Construction Surrey for guidance. Step 2: Understand Local Planning Policies Each borough—Guildford, Elmbridge, Woking, Epsom & Ewell, and others—has its own Local Plan, which sets rules for building work. These policies cover: Building scale and height Design and materials Neighbour impact (privacy, light, outlook) Environmental impact Researching these guidelines early gives your project the best chance of success. Step 3: Create Detailed Plans A strong planning application depends on clear, accurate documents. Typically, you’ll need: Architectural drawings (site plans, elevations, floor layouts) A Design & Access Statement explaining how your design fits local policy Supporting reports (e.g., tree surveys, flood risk assessments) At Jigsaw Construction Surrey , we collaborate with skilled architects to make sure every application is thorough and professionally presented. Step 4: Submitting a Planning Application in Surrey Applications are submitted online via the Planning Portal or your local council’s website. Fees vary depending on the type of project. Once submitted, your application enters the consultation stage. Step 5: Neighbours & Community Consultation Neighbours and other stakeholders are invited to comment on your application. Common concerns include: Loss of light or privacy Parking and traffic impact Design compatibility with the local area Tip: Talking to your neighbours in advance can reduce objections and speed up the approval process. Step 6: The Planning Decision Most councils in Surrey aim to decide within: 8 weeks for smaller projects (such as home extensions) 13 weeks for larger developments If approved, you’ll receive a decision notice with any conditions. If refused, you can appeal—or make changes and reapply. Step 7: After Planning Permission – Building Regulations Even if planning permission is granted, you’ll still need to meet Building Regulations . These ensure that your project is structurally sound, energy-efficient, and safe. Our team at Jigsaw Construction Surrey helps clients every step of the way—from planning permission through to Building Regulations approval and construction. Why Choose Jigsaw Construction Surrey? Navigating planning rules can be complex, but we make the process stress-free. As trusted Surrey builders , we: Advise if planning permission is required for your project Work with architects and planning consultants Submit and support your application Deliver high-quality home extensions, loft conversions, and renovations With our experience, you’ll have peace of mind knowing your project is in expert hands. ✅ Thinking about a home extension or loft conversion in Surrey? Contact Jigsaw Construction Surrey today to discuss your plans—we’ll guide you through planning permission and bring your project to life.
by Lisa Woolnough 1 August 2025
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by Lisa Woolnough 6 July 2025
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