How much does a loft conversion cost?
The loft conversion costs in this article are correct as of 2022
When you run out of space in your home and extending or moving isn’t an option, then the only way is up - into the loft.
When it comes to how much a loft conversion costs, the prices involved are calculated around a few key factors:
- 阁楼转换的风格-天窗，折叠式山墙或髋到山墙?
- The size of the conversion
- The quality of the build and the finish
We spoke to some of theexperienced loft conversion specialistson MyBuilder to find out how much you should expect to pay.
Loft conversion cost calculator
The cost of your loft conversion will depend on a variety of factors. The key factors are the style of loft conversion you choose, and the size of the your property - as well as the purpose and finish of the conversion.
Average prices for common types of converson work out as follows:
| Loft conversion types | Average cost |
|---|---|
| Room in loft | £20,200 |
| Dormer | £52,000 |
| Hip to gable | £62,000 |
| Mansard | £67,000 |
As most lofts cannot be simply altered into habitable rooms due to building regulations, there will almost certainly be structural work that needs to be carried out to convert the loft.
We've broken down the most common types of conversion and their differences below:
- Adding a loft room:If you have the space already in the loft (i.e the height between the bottom of the ridge timber and the top of the ceiling joist is 2.2m or greater), then converting it into a room simply involves adding a staircase, skylights, insulation, and often reinforcing the floor, along with final fitting and decoration.
- Dormer loft conversions:The most common style of structural loft conversion, these are an extension to the existing roof, building out sections with vertical walls from the roof to add floor space and room for windows.These are suitable for most types of home, including terraced house loft conversions.
- Hip to gable conversions:An option for detached and semi-detached homes where the roof has at least three slanting sides, a single hip to gable conversion fills out one of the sides by building a vertical end wall, giving you a larger amount of interior space. A double hip to gable conversion can be done on detached houses, building out on both sides.
- Mansard roof conversions:These are the most dramatic style of conversion, involving changing the entire roof structure, adding a flat roof with sloping “walls” at 72 degree angles, and dormer windows added. It adds the most room, but significantly changes the exterior appearance of the property.
Room in loft conversion costs
As the simplest method of converting a loft, this is the cheapest way to proceed, though it is only suitable for some homes.
价格一般在17250英镑到23000英镑之间，伦敦和东南部的价格往往更高，因为那里更需要商人。
Dormer loft conversion costs
As dormer conversions are relatively straightforward to add to a home, they are a cheaper type of conversion, with the cost typically coming in at around £36,000 to £67,000 depending on the size of the conversion and other factors, with an average of around £52,000.
Hip to gable loft conversion costs
The added complexity of hip to gable conversions means they are typically more expensive, with a starting price of around £48,000, going up to around £75,000, with an average of around £62,000.
Mansard loft conversion costs
As a mansard conversion involves the most complex and complete overhaul, it is the most expensive option, beginning at £52,000, and going up to around £80,500, with an average cost of £67,000.
Bungalow loft conversion costs
Any of the three main styles of attic conversions can be done to a bungalow if the property is suitable and planning requirements are met, so the costs of a bungalow loft conversion can vary from around £35,000 to £80,500.
Stages of a loft conversion
A loft conversion project goes through several stages of building, which are broken out below.
Establishing individual prices for each section is difficult, as many builders will not separate costs for individual elements which form part of the main build.
然而，如果你正在进行阁楼改造，许多房主会同意分期付款给他们的商人，通常是在以下几个因素竞争之后。世界杯荷兰vs威尔士竞猜
Loft conversion plans costs
It is advisable to get comprehensive plans drawn up for your conversion, either from an architect or an architectural technician.
这将准确地列出将要发生的变化以及完成的项目的外观，考虑到所有需要进行的相关结构变化，包括所有必要的计算。
这项服务的典型价格约为1150英镑(加上增值税)。
Planning permission costs
For the majority of loft conversions, planning permission will not be needed, as the changes will count as permitted developments.
然而，也会有一些情况，这取决于改建的规模和其他因素，比如如果你的家在自然保护区，可能需要申请规划许可——目前在英格兰，这是206英镑。
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Building regulation costs
无论你的规划状态如何，你的改建都必须经过当地政府建筑法规部门的检查，以确保它是按照规定建造的，确保它符合消防安全、通道、地板强度等方面的要求。
提交检查计划和进行现场检查的费用大约在400 - 800英镑之间。
如果你的工作影响到任何相邻的房产，比如你住在联排别墅或半独立的房子里，你可能还需要一份墙协议。这需要你的邻居同意正在进行的工作。
You are liable for costs such as their surveyor and any damage to their home which may occur as part of the works - it can cost several thousand pounds depending on how complex the agreement is.
Another potential cost, though not always needed, is a bat survey if you believe your loft may have bats - this can cost up to £400.
Loft building costs
一旦所有计划完成和批准，工作就可以开始。通常情况下，最初的工作将在外部进行，使用脚手架，在某些情况下使用屋顶罩，以便在恶劣天气下有效地继续工作。
在某种程度上，从内部进入阁楼的通道将被创建，地板将被加强。将建造天窗，并改变屋顶。
然后将安装内墙和隔热材料，安装楼梯等功能，然后安装窗户。在涂上灰泥、安装踢脚板等木工设备之前，电气和管道设备会先进去。
Electrical sockets and elements like the WC and sink, if needed, are then added, before the final conversion is ready for final inspection, and decoration can then take place. This is where the bulk of the costs are spent.
Other loft conversion costs
阁楼的最终装修将对项目的成本有很大的影响——例如，如果你只是打算把这个空间用作一个大卧室，它将比你在空间中放置一个浴室更便宜，在那里你需要购买套房，可能需要几千英镑。
Other factors include things like moving water tanks, if needed, and the number of windows being fitted.
A slate roof will usually cost more to alter than one with concrete roof tiles. Another factor is whether the roof was built with a frame - often found in pre-1960s homes - or with wooden trusses, which are easier to construct but can take less weight.
Replacing or reinforcing the trusses can take more work and thus increase the costs.
MyBuilder Top Tip
注意消防安全——这将是建筑法规检查你的计划和建筑工作的关键部分。
You may need to install special fire safety doors and mains-powered fire alarms, or make changes to your window plans to allow ladder access.
The person who creates your plans should help address this, but be prepared that you may have to alter your original vision to make your conversion comply with the rules.
How long does a loft conversion take?
The actual building portion of a loft conversion will typically last between six to eight weeks, depending on the complexity and scale of the project.
However, the planning stage can also take a considerable amount of time, especially if planning permission is required and a Party Wall Agreement needs to be negotiated.
You will typically be able to stay in your home throughout the duration of the work though, with only minor disruption.
How to keep your loft conversion costs down
确保你的阁楼转换不是不必要的昂贵和运行预算的最好方法是雇用可靠和有经验的商人，他们擅长处理任何复杂和管理成功的项目。
At MyBuilder, we usually advocate hiring particular specialists for each role, however, with loft conversions, there are a number of ways of hiring the necessary tradespeople.
This could involve hiring an architect to plan and then oversee the entire project, hiring a team of builders and other necessary trades, or hiring a specialist loft conversion firm who will have a team with all the needed skills.
You can also project manage the work yourself, hiring different tradespeople for different elements of the work, however, to help ensure everything runs smoothly and the timings all work, this can introduce more risk, as one part running late can impact later work.
调整你的计划，试着确保改造中需要的水管超过你家里已经有的水管，这也有助于降低价格，因为它消除了更复杂的水管工作。
