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The Ultimate Guide to Planning Your House Extension: Costs and Considerations

Planning a house extension can be an exciting project, but it requires careful consideration and planning to ensure that it meets your needs, fits your budget, and complies with regulations. This ultimate guide to house extensions will help you understand the different types of extensions, factors that affect the cost, planning permission and regulations, finding the right professionals, and tips for a successful project.

A house extension is a great way to add more space, increase the value of your property, and improve your living conditions without the hassle of moving to a new house.


House extensions come in different shapes and sizes, and can be designed to fit your specific needs and budget. Whether you want a conservatory, a single storey or double storey extension, or a garage conversion, a house extension can transform your home and provide you with the extra space you need.

Lean to conservatory with solid tiled roof

Introduction to House Extensions

Benefits of House Extensions

There are several benefits to adding a house extension. First and foremost, it provides you with more space, which is essential if you have a growing family or need more space for a home office or a gym. A house extension can also increase the value of your property, making it more attractive to potential buyers if you decide to sell in the future. Additionally, a well-designed house extension can enhance the aesthetics of your home, improve natural light and ventilation, and create a more comfortable and functional living space.

Consultant - Solid Conservatory Roof Costs. Conservatory Roof Quote

Every home is unique and requires an individual extension quote. Just answer a few quick questions to find out how much a new house extension would cost. It's quick and simple to get prices and compare options.

Factors Affecting House Extension Cost

The cost of a house extension depends on several factors, including the size and type of extension, the quality of materials used, the complexity of the design, and the location of the property. Generally, conservatories are the cheapest type of extension, followed by single-storey and double-storey extensions. Other factors that can affect the cost include the need for structural work, plumbing and electrical installation, heating and ventilation, and landscaping. It is important to factor in these costs when planning your house extension to avoid any unexpected expenses.

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Types of House Extension

There are several types of house extensions to choose from, depending on your needs, budget, and the design of your home. A conservatory is a popular choice for those who want to create a bright and airy space that can be used as a sunroom, dining area, or playroom. A single-storey extension is ideal for those who want to add a new room or extend an existing one, such as a kitchen, living room, or bedroom. A double-storey extension is a more substantial project that can add multiple rooms to your home, such as a master suite, additional bedrooms, or a study.

Lean to conservatory with solid roof
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Our Expert Says

"When adding a new extension to your home think carefully about how you're planning to use the space. This can help you get defined costs and a tailored quote that meets your needs"

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Planning Permission and Regulations

Before you start planning your house extension, it is important to check whether you need planning permission or building regulations approval. Planning permission is required if your extension exceeds certain size limits or if it affects the appearance of your home or the surrounding area. Building regulations approval is required to ensure that your extension meets health and safety standards and energy efficiency requirements. It is important to work with a professional architect or builder who can guide you through the planning process and ensure that your extension complies with regulations.

Replacing a conservatory roof with a solid roof cost

Finding the Right Architect and Builder

Solid roof planning permission

One of the most important steps in planning your house extension is finding the right architect and builder. A good architect can help you design a functional and aesthetically pleasing extension that meets your needs and fits your budget. A reputable builder can ensure that the construction process is efficient, safe, and meets quality standards. It is important to do your research, check references, and get multiple quotes before choosing an architect or builder to work with.

How to Plan and Design Your House Extension

Planning and designing your house extension requires careful consideration of several factors, including your budget, needs, style preferences, and regulatory requirements. It is important to work closely with your architect or builder to create a detailed plan that includes all the necessary elements, such as layout, materials, lighting, heating, ventilation, and landscaping. A good plan can help you avoid costly mistakes and ensure that your extension meets your expectations.

Replacing a conservatory roof with a solid roof cost

Finding the Right Architect and Builder

House Extension Cost Breakdown

The cost of a house extension can vary widely depending on the size, type, and complexity of the project. A conservatory can cost as little as £5,000, while a double-storey extension can cost upwards of £100,000. It is important to break down the costs of your house extension to ensure that you stay within your budget. The main cost components include design and planning fees, building materials, labour costs, and additional expenses, such as plumbing and electrical work.

Financing Your House Extension

Financing your house extension is an important consideration, as it can be a significant investment. There are several options available, including remortgaging your home, taking out a personal loan, or using your savings. It is important to weigh the pros and cons of each option and choose the one that best fits your financial situation and goals.

House Extension Project Timeline

The timeline for your house extension project depends on several factors, including the size, type, and complexity of the project, as well as regulatory requirements and weather conditions. Generally, a conservatory can be completed in a few weeks, while a double-storey extension can take several months. It is important to work closely with your architect and builder to create a realistic timeline that takes into account all the necessary steps, such as planning, design, construction, and finishing.

Tips for a Successful House Extension Project

Planning and executing a successful house extension project requires careful planning, attention to detail, and effective communication with your architect and builder. Some tips for a successful project include setting a realistic budget, choosing the right professionals, creating a detailed plan, obtaining necessary permits and approvals, monitoring the construction process, and being flexible and adaptable to changes.


Planning a house extension can be a complex and challenging project, but with the right guidance and resources, it can also be a rewarding and enjoyable experience. This ultimate guide to house extensions has provided you with valuable information on the different types of extensions, factors that affect the cost, planning permission and regulations, finding the right professionals, and tips for a successful project. By following these guidelines and working with experienced professionals, you can create a functional and stylish house extension that meets your needs, fits your budget, and adds value to your home.

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Helpful Articles


Lean-to conservatory with a solid roof


Solid Roof Conservatory Costs and Benefits

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Solid Tiled Conservatory Roof Costs

  • Do I need planning permission for a solid roof conservatory?
    In the majority of instances, replacing a conservatory roof with a solid alternative typically doesn't require planning permission. However, it's essential to verify the structural integrity of the conservatory before proceeding with the installation of a new solid tiled roof. Your chosen installer will typically conduct a thorough survey of your conservatory before embarking on the roof replacement process. Feel free to consult a conservatory expert at no cost to discuss your specific conservatory requirements and concerns.
  • How much does a solid conservatory roof cost?
    The price of a solid roof conservatory can significantly fluctuate based on factors like size, materials, internal and external finishes, and additional considerations. To obtain a precise cost and secure the optimal deal, our complimentary quote service is the ideal route. Through our service, you'll be linked with up to three local conservatory experts who will provide a customized quotation for your solid roof replacement. This approach enables you to compare prices, services, and warranties, ensuring that you secure the most advantageous all-around deal.
  • Can I replace my current roof with a solid tiled roof?
    Absolutely, it's entirely feasible to swap your existing conservatory roof for a solid alternative in the majority of cases. After linking you with a nearby specialist, they will conduct a complimentary survey to assess your conservatory's structural capacity for accommodating the additional weight. In isolated instances, it may be necessary to reinforce the structure before proceeding with the installation of the new roof.
  • Are solid conservatory roofs worth it?
    A solid conservatory roof brings forth a multitude of advantages, making its cost a valuable investment for numerous individuals. Enriching your conservatory with a tiled roof not only expands the usable living area within your residence, but its benefits extend beyond that. Regarded by many as a rewarding home enhancement, a solid roof contributes to the overall value of your property. Moreover, it acts as an avenue for enhancing your home's energy efficiency, effectively retaining warmth during winter and ensuring a cool environment throughout summer. For potential homebuyers, a solid roof conservatory is often a major attraction, offering additional space that seamlessly integrates with the home and can be fully utilized.
  • What are the benefits of replacing a conservatory roof with a solid roof?
    Replacing a conservatory roof with a solid alternative offers a host of advantages. Here are some key benefits: Expand your usable living space year-round. A solid roof conservatory seamlessly integrates with your home and serves as a versatile space throughout every season. Maintain warmth in winter and stay comfortably cool in summer within a solid roof conservatory. Enhance your home's energy efficiency by preventing heat loss and keeping cold air at bay with a solid roof conservatory. Elevate both your lifestyle and property value through the investment of a solid roof conservatory. Achieve significant cost savings, as a solid roof conservatory is more budget-friendly than other extension options, all while providing genuine living space. The replacement of a conservatory roof with a solid alternative often bypasses the need for planning permission, ensuring a streamlined and stress-free process. Explore various interior finishes to tailor your solid roof conservatory to your preferences. The popularity of replacing conservatory roofs with solid options has surged among UK homeowners, and this trend is supported by a wealth of positive solid roof conservatory reviews.
  • What is the best type of roof for a conservatory?
    The best roof for a conservatory depends on how the space will be used. A solid roof turns a conservatory into a real living space that can be used as part of the home all year round. In effect, a solid roof conservatory is an extension of your home. So, if you want to extend your home and make full use of the space, a solid roof is the best option. A glass roof is creates a light space that can be enjoyed on those cooler days. Glass roofs do not usually offer the same level of insulation as a solid roof, so can still get very cool in the winter months. It's also worth keeping in mind that glass is not the best option for south facing conservatories as they can become unbearably hot in the summer months. Poly carbonate roofs offer a cost effective solution for conservatories as a glass alternative. There is very little insulation, so the space can become very cold has has little noise reduction. It is not the best option if you want to use your conservatory as a real living space but, as a utility room a polycarbonate roof could be a good option.
  • What is a solid conservatory roof?
    Conservatories outfitted with a solid roof exhibit thermal efficiency up to 15 times greater than standard polycarbonate roofs. These solid roof conservatories also excel in noise reduction, heat retention, winter cooling, and bolstered security. Most significantly, the investment in a solid roof for your conservatory translates to a genuine home extension that remains functional throughout the year. Typically, a solid roof conservatory features tiled roofing. The tile selections are contingent on budget and the intended room usage. The usual tile choices encompass standard slate or lightweight composite replica tiles, offering excellent value. Additionally, the option for incorporating glass panels into the roof is available. Given the uniqueness of each conservatory, consulting an expert is advisable to determine the optimal choice tailored to your needs. This ensures that you make an informed decision regarding your conservatory's roofing solution.
  • How do I replace my glass conservatory roof with a solid roof?
    Utilize our quote tool for a seamless transition to a solid conservatory roof. Upon form completion, an adept conservatory specialist will reach out to ascertain your requirements. They will outline your alternatives and coordinate local expert quotes on your behalf. Generally, replacing a conservatory roof with a solid version is a straightforward procedure devoid of planning permission hassles. Solid roof conservatories stand as an economical avenue for expanding your home's living space.
  • I'm looking for solid conservatory roof installers near me. Can you help?
    Yes, we have a panel of solid conservatory roof installers nationwide. Where ever you are in the U.K. we will most likely have installers near you. We match our customers with local installers, this insures that your quote is accurate and that you have an expert near you before, during and after the work has been completed. If you want to find an installer near you, just get a quote and we will match you with a local installer.
  • Can I have a lean to conservatory with a solid roof?
    Certainly, the transformation of your lean-to conservatory roof into a solid tiled one is feasible. Solid roofs are adaptable to a wide array of conservatory styles. Lean-to conservatories, known for their popularity, align well with the sleek and contemporary appearance a solid roof can offer. This choice elevates your conservatory's aesthetics and modern appeal.
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