Put simply, a structural engineer helps ensure your home stays standing. As their name suggests, they look after the structural calculations required for your project, which tends to be more complex for a wraparound extension than for other single-storey extensions.
A structural engineer will typically start work on your project after planning, during the building regulations stage.
They can cost anywhere between £950 to £2500.
When you start your project, you’ll require a measured survey to be carried out. This will map out your home as it stands today and forms the foundation for the rest of your project.
At Resi, we use the latest laser technology to create 3D models of your property, giving you the best start possible. Other surveyors tend to rely on a mixture of photography and manual measurements.
- Our measured survey costs start at £250 and are included as part of our architectural services.
- If opting for a local professional over Resi, you can expect to pay £400 to £500+, depending on your location.
Learn more about measured surveys here.
Alongside this initial survey, you may also require a CCTV drainage surveyor and a party wall surveyor. This later professional can be brought in to secure consent from your neighbours, should a shared boundary be involved.
CCTV drainage surveyor costs: £250 to £350
Party wall surveyor costs: £100 to £140 an hour
The cost of your fittings will be affected by what kind of rooms you’re looking to create. Bathrooms and kitchens will naturally cost more than more basic spaces, such as living rooms and bedrooms.
If you’re looking to get a rough cost of these rooms ahead of time, a good rule of thumb is to base your calculations on the current value of your property.
Bathrooms tend to cost 1%-4% of your home’s value and kitchens 2%-5%.
For example, a property that’s valued at £400,000 would probably pay…
- £4,000 to 16,000 for a bathroom
- £8,000 to £20,000 for a kitchen
Learn more: a guide to working out the total cost of your project
Good glass doesn’t come cheap, so you should bear in mind their expense during the design stage. Large expanses of glazing, such as for a glass ceiling, usually require the use of structural glazing. This will not only incur more work from your structural engineer, the cost of this glass will be more per square metre.
Learn more about the cost of glazing here.
While 50% of your overall budget will be spent on construction and materials, there are a lot of other costs that homeowners fail to consider.
This includes: surveying costs, structural work, glazing, architectural requirements, fittings, and that all-important VAT.
To ensure your budget ticks off all the requirements, we recommend talking to an expert for a tailored breakdown of costs. Book your free advice call here.
Not sure how much you can afford? See how much you could borrow by using our free finance calculator.