Structural Engineer

If on one side the design aspect of the project can be fun, coming up with general costs and budget can be difficult. The general cost of your extension will ultimately depend on your brief. However, some general costs for a single storey rear extension can be summarized as follows:
– UK Average sqm: £ 1,200
– London Average sqm: £ 1,600

These are general costs for an average quality extension. The higher end projects cost in London can go up to 2,300£ sqm.
A further breakdown of general costs can be summarized as follows: The use of your extension will also impact costs. Having an idea of how much you are willing to spend on a new kitchen or a new bathroom will be crucial when planning the cost for your new project. Bathrooms and kitchens are trickier to budget than a bedroom or a living room as there is plumbing to take into consideration as well as appliances and fittings.The cost of adding a kitchen to your extension will start around 10,000 £ for a cheaper kitchen design. The final cost will depend on the quality of the materials and appliances. dding a bathroom to the project will increase the cost of about 5,000£, but this will also depend on the type of finishes you want.

Rule of Thumb: As there are many variables to the costs of your project, it is good to have a general idea of how the budget will be spread and how the costs for professionals will impact the total cost: Architects London average fees 10% / Administration fees: 1% / Structural angineer: 4% / Surveyors: 3% / Contractors:30% / Materials 20% / Fittings 5% / Glazing: 15% / VAT 20%

The good news is, if you live in a terrced or semi-detached house in 2020, Local Planning Authorities have relaxed the rules and allow for extensions to go to 6 meters . If you live in a detahced house, single storey rear extensions can be up to 8 meters in depth. Just be aware that if your property type is a flat, maisonette or in a conservation area, then you will need full planning permission.

Side Extensions: Side extensions fall under permitted developent if they do not extend more than half the width of the original house. You can extend a maximum of 3 meters as long as it is a single storey extension and does not extend pas the front elevation.

Research carried out by Nationwide shows how home improvements and home extensions can add significant value to your property. Adding a double bedroom to your house and an en-suite can increase value by 23%. Adding square footage with a kitchen extension and more in general a single storey rear extension will boost the value of your property by 13%.