- 1 Introduction
- 2 House Extensions Cost – Initial Cost Appraisal
- 3 Estimating House Extension & Renovation Costs
- 4 Flat pack extensions cost
- 5 Cost of House Extension
- 6 Different Extension Types
- 7 Why hire a professional house extension company?
House extensions may seem expensive in the beginning but after effective cost analysis you will get rough idea of the actual amount that you will need to budget for so you can have that extra room you need for your growing family. Home extensions is a great alternative for home owners who need to build an extension on a budget because flat pack extensions have a natural look even though the walls are prefab.
Your budget for the extension should include all the materials, construction fees and house plans that will be required for renovating your home. Before you even start working on idea, you need to know about the building regulations so as to comply with it in regards to the location of sewers and other infrastructure. Ask a professional builder to offer you house extension ideas that you may not have thought of or even considered as a possible option. If you are trying to cut on cost of an extension then you should also enquire about the rules and regulations of flat pack extensions, glass extensions and timber extensions to ensure that these extensions are legal in your area.
House Extensions Cost – Initial Cost Appraisal
The average cost for a house extension comes to £1,500 – £2,000 per m2 in London and South East and between £1,200 – £1,500. To this cost you should add a 10-15% for professional fees + VAT. For two-storey extensions, to the total price you also need to include add 50% to the cost of a single-storey extension.
Timber and Pre-fab house extensions are some of the most cost effective solutions for extending homes but will not improve your property value. Brick extensions are quite expensive but are more durable and will increase your property value immensely. Glass room extensions are becoming increasingly popular because glass rooms and extensions bring in a lot of natural sunlight into your home, it is still a safe and secure solution and looks fantastic. Glass room extensions are also great for improving your property value if your home has a modern style.
When planning for your home extension, apart from the cost of the structural materials, it is equally important to take into consideration the following factors in the cost of your house extension:
- The type of the existing building and its condition
- How accessible is the building
- Demolition requirements
- Existing drainage and services
- Changes to the internal of the property
- Internal decorations.
- Alterations to the external face of the building
- Level of upgrade required to services, heating, etc
- Any fixtures, fittings and equipment required.
- Fees (architect, planning application, building regs, structural engineer etc.)
Estimating House Extension & Renovation Costs
We have created a simple guide to help you estimate the overall cost of an extension by understanding the possible costs per square meter. The suggested cost does not include VAT. However, this guide should be only used as a starting point, as the actual cost will depend on many different factors such as:
Alterations To The Main House
There is need for the builder to gain access to the extension by removing an existing external wall. This might involve steel support beams, flooring and general disturbance to the house while this is done. Many builders execute this job as late as possible so there is the least amount of disturbance.
Administrative and Miscellaneous Costs
This includes hiring for rubbish removal, a project manager, architect fee, insurance and any building control and search fees. Also, if you are modifying your mortgage or getting a new one for the extension there are also bank fees to take into consideration.
Interior Decoration and Refurbishment
These costs include all the decorating items, such as light fittings, switches and paint, wallpaper and floor coverings to match the rest of your home. Your interior design can also include flat pack or glass extensions within your home to divide rooms, build in walk in closets or to hide unsightly bits of your home. A lot of glass extensions are installed in home simply for interior decorative reasons.
It is very difficult for a home-builder to estimate the house refurbishment and renovation costs on a square meter basis because each area of the house might requires different attention.
|Extension Work (Typical terraced house)||Cost|
|Construction of new side and rear extension||£1,250|
|Full refurbishment and restructuring of existing kitchen||£1,750|
|New heating, electric and decoration to living room and playroom.||£1,000|
Flat pack extensions cost
Traditional house extensions can prove costly, with most homeowners investing between £26,000 and £50,000 (on average) for a 2o m2 single storey project. Flatpack house extensions, however, can cut costs by an average of 20% (although this figure can prove as high as 25% or as low as 10%, depending on the property and the amount of work needed.)
In real terms, this means that the cost of a traditional house extension that will come to around £35,000 could be reduced to £28,000, if the homeowner opts for a flatpack extension instead. The money saved could then be put towards interior decorating; plumbing and other tasks that require the help of a professional. This can create substantial savings in the long-term, and provide customers with the opportunity to expand their extension further, or alternatively invest the money in other home improvement related tasks.
Prefab extension brands
Huf Haus: They take about a week to install and cost around £3,400 per square metre.
Baufritz : The average cost of a Baufritz house extension is £2,200 per square meter.
Scandia Hus: The average cost for a Scandia Hus extension is between £1,450 to £1,750 per square metre.
Glass Room Extension Cost
A typical glass extension costs between £20,000 – £80,000. For a cheaper solution you can go for a modern conservatory and expect to pay between £4,000 – £20,000. Frameless glass structures look very beautiful but if you use panels that are longer than 240 cm, the cost nearly doubles. A single reinforced glass panel costs from £1,000.
Bellow you can see several estimates for glass room extensions:
Weinor Glass Room – 3m width x 3.5m projection, sliding frameless glass doors on all three sides, from £17-£18,000 fitted together with VAT
Weinor Glass Room – 6.5m width x 4m projection with sliding frameless glass doors on all three sides, from £28,000 fitted together with VAT
Weinor Terrazza glass terrace cover with under glass awning with lights and heater: 5m width x 4m projection from £14,150 fitted together with VAT
Timber Frame Extension Cost
The approximate timber frame extension cost is around £1,200 per square meter based on Evis Build for a 60 square meter rear extension.
For a double story extension, you should consider about 160% of the price for a single story extension of the same floor area. For example a single story 25 square meter extension may cost £33,000, a two story timber extension will be around £53,000.
There are several house extension ideas to select from that will suit your budget.
Cost of House Extension
Of course, there isn’t any actual way of discovering until you’ve got an actual idea of what you want and gone through by a professional evaluator, quantity surveyor and accountant. And even then the extension cost varies greatly depending on the materials that is used for the extension. We’ve gathered the following estimates to help give you a perception of how much will be needed before you can begin:
According to a customer the average cost of a house extension is £25,000Double Storey Extension cost: £45,415 – £76,000. Single Storey Extension cost : £22,916 – £37,000. Planning and Preparation home extensions cost: £5,132 – £10,150.
For more accurate figures you should try and get in touch with professional house extension companies immediately. They will be able to review your ideas and provide an up-to-date evaluation of your property in a way that will help you streamline your plans and keep the price of your house extension as low as possible!
Different Extension Types
Pre-fabricated or flat pack extensions in UK will be between 10 and 25% lesser in price than an extension built on site. This type of extension is made primarily in a factory where the walls are built and then setup on site. This is a popular choice for owner builders as there is a lot less work involved and for home owners who are looking for a temporary and more cost effective solution for their homes.
Prefab extensions can be insulated for noise and temperature controlling so your private conversations will remain private and your home will require far less energy to keep temperatures stable. Prefabricated extensions can be given a natural look and can be incorporated into any section of your home without anyone ever realising that your home have been altered.
Our world has an abundance sunshine that can not only lights your homes but also help fight back the darkness in your heart and mind. Glass extensions are perfect for bringing natural sunlight back into your home and allow you to cultivate orchids and other plants indoors that you would otherwise be unable to grow. The glass is of special quality and is often double glazed for additional insulation. The roof can also be made of glass for more reflection of light.
Timber frame extensions are built on site from sustainable timber and are an eco-choice for the house owner. They are well insulated and can be built to match the existing structure and made to look like part of the original house and not an extension so your home will look natural even though there are artificial walls.
Flat Pack Extensions
Those looking to extend their house may opt for flat pack extensions; these are easy, prefab extensions that homeowners can add to their property with minimal disruption. While there are, of course, certain parameters users most follow, as they often prove to be the most resourceful option available.
The Benefits Of Flat Pack Extensions
Flatpack extensions are noted for being significantly cheaper than traditional extensions, or other alternatives used to add space to a house. However, they offer many other benefits too. They can, for example, be largely assembled offsite and then transferred to the intended property. This reduces the amount of work being carried out in a home, which in turn minimises the inconvenience and disruption suffered by families.
Flatpack house extensions now also offer the height of modern convenience. Many extensions are prefabricated to include insulation, for both sound and temperature, as well as other features that reduce costs and building time. Some flatpack extensions are even created with the ease of the user in mind, and can therefore be delivered in such a way that homeowners themselves can carry out a large portion of the work, without much professional intervention.
Why hire a professional house extension company?
There are a lot of cheap house extension companies whose products may seem fantastic at first but they lack the quality and will soon start to deteriorate. Prefab extensions should be of the best quality materials and glass extensions should be done correctly to ensure your extensions do not end up cracking or bursting. A home extension professional will also be able to inform you of the durability of the product so you will know whether your prefab extension is suitable for exterior walls and your glass extensions are smash proof so your family will be safe and secure.