Homeowners opt for single storey rear extensions to enhance size of living or storage space, also resulting in an appreciation in their property value. In this article we will cover major questions and concern that homeowners have when adding a Single Storey Rare Extension to their home.
Q1. Do I need Planning Permission for Single Storey Rear Extension?
No, under most usual conditions you may not need planning permission. Building regulation law and thorough permitted development rights allows homeowners to add extensions to their property without any planning permission. In some specific cases you may need planning permission for single storey rear extensions;
- If the extension is higher than 4 meters, you may need prior approval which allows extension up to 6m general ad 8m detached extension.
- Single storey rear extensions cannot be built beyond 3 meters from home’s rear wall for semidetached homes and 4m for detached homes.
- Certain specific condition may require you to check with planning department for clarifications. Contact us today for guiding you on customisations, design possibilities and specifics of rear extensions.
- For single storey extensions, only 50% of the land area can be used. Any prior additions or outbuildings should not be included in the area covered by the house. Single storey extensions can’t exceed 50% of the area of land your house sits on. This excludes the area covered by the house, but doesn’t include any existing additions or outbuildings. (I couldn’t understand this point)
- Main elevation cannot be extended forward. Even the side elevation cannot be extended if that faces highway.
- For a detached house, the single storey should stay within 4m of the original back wall. The same measurement is 3m for terraces and also for semi-detached properties.
- The single storey extension can only be 4m high or less than 3m if its within 2m of a boundary.
- It is important to note that the building material used for single storey extension should be same as the original material used for existing home structure.
Q2. Do I need to hire an architect for Single Storey Rear Extensions?
Yes, it is advisable to hire an architect, for single-storey rear extension. Engaging an architect might not be mandatory, but it’s a strategic decision. Architects, being highly skilled professionals, bring extensive knowledge to every phase of the extension process. Their expertise in maximizing space can transform your home. By overseeing your project, an architect ensures superior design and efficient use of resources. Architect’s enhance your home’s aesthetics, longevity, and overall value, making it a smart investment for homeowners seeking to expand their living space.
It is absolutely fine for a homeowner to get creative and draw a sketch and envision what they want out of their loft and how should it look like. However, it is a good idea to at least get your plans reviewed by an architect. We’ve observed cases where homeowners lose money by initially begining their construction projects solely with contractors, only to later seek the expertise of an architect. This change often occurs due to challenges such as unexpected expenses, unsatisfactory design outcomes, or delays that arise during the construction process.
Q3. How Much Does a Single Storey Rear Extension Cost to Build?
A basic rear extension can cost you anything between £1,200 and £2,800 per square meter. Some factors that affect this cost include size of extension,
The cost of sophisticated extensions can be significantly higher. It also depends on the locality as property costs in premium areas such as London are higher as compared to others. Furthermore, new extensions fitting add more to the original cost. It is important to note that the cost of different spaces in one more property can vary greatly i.e. the cost of bathroom and kitchen fixtures would be higher as compared to garden.
Therefore, prior to making any constructional changes in terms of kitchen and bathroom fixtures, it is important to do necessary research and then make the decision realistically. Any costs pertaining to recruiting any professional like an architect or professional engineer should also be established prior to making any final decision. Heating, flooring, lighting and any other relevant cost like decorating must be considered beforehand.
Q4. How long would it take for approvals?
If you want to go for a bigger construction under PD, one can try for a larger single storey construction via the Prior Approval Scheme. The measurement for single storey under this scheme can be within 8m for detached houses and within 6m for semidetached house or terrace. The said scheme allows neighbors to object within the period of 21 days if they have valid reasons. Post that period, local Planning Authority may take up to 21 days to approve the given application. Once approved, you need to pay the fee for a Lawful Development Certificate (LDC) which verifies that the project fulfils all the legal requirements.
Although the above mentioned certificate is not a legal requirement for all extensions and amendments, it can still come in handy. It definitely verifies that the construction under this project was lawful since the beginning. The cost for this certificate £103.
Q5. How much does it cost for full planning permission application?
If a formal application is a requirement for a house extension, one needs to see if there any finished schemes having similar structure in the given area. The cost for this application is £206. It is important to note that the prior presence of similar precedent can have an impact on the approval of application. It can also be useful to contact the local planning authority before submission of original application. This step is called a pre-planning application. The planning officer assigned to your case would examine your application and will let you know if it breaches any relevant policies.
The output of this procedure does not constitute as a final answer. Instead, it acts as a guiding tool for increasing your chances of getting an approval. The cost of this services is generally in between 50 and £200 depending on the council.
For single storey extensions, the Building Regulation approval is a must and it can be attained by two methods. The first method entails examination and approval of complete plans and drawings by Local Building Control Authority before the commencement of work. For a complex project, this is usually the preferred route.
The second method entails a Building Notice Form which allows you to start work 48 hours after receiving your notice by the local authority. However, this method is only preferred for simple straightforward constructions and projects that do not require details drawings.
Q6. What do I need to consider in designing of the extension?
A popular design for single-storey extensions is the open-plan layout, which involves removing internal walls on the ground floor to seamlessly integrate the old and new spaces.
Key design elements to consider include:
- Creating a smooth transition between the existing structure and the new rear extension.
- Preventing the central area of the floorplan from becoming too dim, especially if the ground floor is fully opened up.
- Ensuring that accessibility features, like door widths and level thresholds, are suitable for current and future needs.
- Strategically placing windows and doors to optimize views and enhance the connection between indoor and outdoor spaces.
Q7. What are the different materials I can choose for construction?
Glass Incorporating well-positioned glass elements can dramatically enhance a rear extension. Not only does it add aesthetic appeal, but it also invites ample natural light into the space, fostering an open, welcoming atmosphere. However, it’s important to consider the placement of glass on south or west-facing walls to avoid potential overheating issues.
Timber Timber, known for its durability and renewable nature, is an excellent choice for external wood cladding. Options include treating it to maintain its original hue or leaving it untreated for a natural, weathered look. Timber is also a popular choice for interior features, such as flooring and carpentry, offering a cozy, warm finish.
Metal Materials like steel, zinc, aluminium, and copper are favoured choices for cladding due to their low maintenance and ability to create a sleek, modern look.
Brick Though traditionally associated with classic styles, brick offers versatile design possibilities for modern extensions. With a variety of brickwork bonds, mortar styles, colours, and blends available, brick can be used to make a distinctive design statement.
Q8. What are the different stages in construction and do I need to have a plan?
Here are the different stages and Yes, you need to chalk out a plan with your contractor in alignment with your architect;
Build Schedule Planning Each house extension project is unique, and while schedules may fluctuate, often due to weather, this planner outlines the key stages:
- Pricing and Mobilisation (5 Weeks) Allocate at least four weeks for comprehensive pricing, followed by an additional week for contractor mobilisation.
- Site Preparation (1 Week) Ensure clear site access, delivery of building materials, and the availability of machinery.
- Groundworks (2-3 Weeks) This phase includes digging foundations, laying pipework, drainage, and services, and pouring and leveling concrete footings. Building Control must approve this stage.
- Superstructure (3 Weeks) Construction of the extension’s frame, insulation installation, and subfloor fitting. This stage requires another Building Control inspection.
- External Walls (2 Weeks) Installation of lintels, doors, window frames, and wall tiles, and connecting new walls to existing structures.
- Internal Walls (1 Week) Construction of internal walls.
- Roof Structure (1 Week) Carpenters build the roof structure, or contractors fit prefabricated roof trusses, including rooflights installation.
- Roof Covering (1 Week) Fitting of roof battens over the membrane and laying of the roof covering, along with finishing details like flashing.
- Windows, Doors & Exterior Finish (3 Weeks) Completion of all exterior finishes, fitting of windows and doors, addition of guttering and pipework, and completion of first-fix carpentry, plumbing, and electrics.
- Plastering & Decorating (3 Weeks) Interior walls boarding and plastering, followed by at least one week of drying before decorating and painting.
- Second Fix (2 Weeks) Installation of second-fix electrics, lighting, taps, flooring, and fitting of kitchens and bathrooms, if included.
- Snagging (2 Weeks) Addressing and resolving any outstanding issues with relevant trades.
- Sign Off (1 Week) Final inspection by Building Control, ensuring compliance and issuance of necessary documentation.
Get Professional Help
Enlisting a skilled architect for house extensions and residential architecture projects can be immensely beneficial. With their training in design and project management, an architect’s expertise can elevate your single-storey extension to new heights. Expect a design that’s not only creative but also optimises light and space, incorporates unique materials, finishes, and fittings, and prioritises sustainability and energy efficiency.
Beyond design, an architect plays a crucial role in assembling a competent team, including a contractor, quantity surveyor, and engineer. They guide you through planning, building regulations, and contractual procedures. If desired, they can oversee the project, ensuring that your home extension is completed on time, within budget, and to the highest standards.
Explore the possibilities with Architecture for United Kingdom’s residential architecture services. To discuss your project and how we can assist, please feel free to contact us.
