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

Sources:

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When it comes to renovations, extensions, or any other significant building works, one of the most important things to consider is whether you need planning permission. In the UK, planning regulations are in place to ensure that development is safe, sustainable, and in keeping with the local environment. Whether you’re looking to extend your home, convert your loft, or build a new structure, it’s crucial to understand when planning permission is required and how to go about securing it. What is Planning Permission? Planning permission is the formal approval you need to carry out building works or change the use of land or buildings. It’s granted by the local council or planning authority in the area where your property is located. In general, planning permission is required for larger projects or works that could affect the surrounding area, but there are some exceptions, particularly with smaller, less invasive projects. When Do You Need Planning Permission? Certain types of works, particularly those that alter the structure or external appearance of a property, will typically require planning permission. Here are some common projects that may need approval: 1. Extensions and Loft Conversions Adding extra space to your home, whether through an extension or loft conversion, is a common reason for needing planning permission. There are specific rules on how far you can extend your property and how the extension should blend with the existing structure. 2. Conservatories While small conservatories may be covered by permitted development rights (which allow certain works without needing permission), larger conservatories, or those that extend into the boundaries of your property, will usually require full planning permission. 3. New Builds and Major Alterations Any new build or major structural changes to a property, including changing the layout or converting commercial properties into residential homes, typically require planning permission. 4. Changes to the External Appearance If you’re changing the appearance of the building by altering windows, doors, or the roofline, you may need permission. This is especially the case for listed buildings or properties in conservation areas. 5. Garden Structures Sheds, greenhouses, or other garden structures can also require permission if they exceed certain size limits or are placed in prominent locations. 6. Swimming Pools The construction of swimming pools or other large garden buildings may also require planning permission, especially if they affect the overall aesthetic or drainage of the property. What Are Permitted Development Rights? In many cases, small-scale works such as some types of extensions or conservatories can be carried out without the need for planning permission, under what’s called "permitted development." These rights allow homeowners to make certain changes to their property without applying for full planning permission, if they comply with specific restrictions. However, there are many conditions that govern permitted development, including: - Size limits for extensions or additions - Restrictions based on the location and position of your property (e.g., proximity to boundaries or listed status) - Limits on the height and depth of structures - Restrictions in areas such as conservation zones Before carrying out any work under permitted development, it’s essential to double-check whether your property qualifies and whether the work falls within the legal parameters. How to Apply for Planning Permission If your project requires planning permission, here’s a general guide to help you through the process: 1. Consult Your Local Planning Authority The first step is to contact your local planning authority (LPA). They will provide guidance on whether your proposal requires planning permission and what rules apply in your area. 2. Prepare Your Application You’ll need to provide detailed plans of the proposed works, including drawings and descriptions of the changes. You may also need to submit additional documents, such as site surveys, design and access statements, and environmental impact assessments. 3. Submit Your Application Applications can be submitted online through the Planning Portal or directly to your local authority. The cost of the application varies depending on the type and scale of your project. 4. Wait for a Decision Once your application is submitted, the local planning authority will assess it. This process usually takes about eight weeks for most applications. However, complex projects may take longer. If your application is approved, you’ll receive formal planning permission. If it’s refused, you have the right to appeal. 5. Building Regulations Approval Even if you get planning permission, you will likely need to submit your building works to building regulations approval, which ensures the construction meets health, safety, and energy efficiency standards. What Happens if You Don’t Get Planning Permission? Carrying out building works without the necessary planning permission can lead to fines, legal action, or even the requirement to undo the work. If you’re unsure about whether you need planning permission, it’s always better to ask before starting. There may also be penalties for failure to comply with other legal requirements, such as not following the right building regulations. 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