Extension Hub

Extending or renovating your home?

Whether you’re thinking of a garage extension, side extension, double or single-storey rear extension, there's lots to consider before you embark on your project. Our selection of articles will help you sense-check your plans and offer you average costs and inspiration.

The stages of an extension project

• Work out what's realistic for your budget - see how much does an extension add to the value of a house?, including the "ceiling price" concept for your area

• Plan the specifics before you get quotes - our single storey extension planning guide and full extension planning guide cover this in depth

• Confirm what's permitted development, and what needs planning permission - extension rules vary significantly by size, position, and property type

• Choose the right extension type for your goals - kitchen diner extensions, flat roof extensions, and utility room extensions all serve different needs

• Get the finishing touches right - see extending the indoors to the outdoors for ideas on blending the new space with your garden

Looking to find out more about extensions?

• How to extend downstairs to add a new level or garage

• How long does a loft conversion take?

• How to build a lean-to

Questions for your extension builder

Qualifications and Experience

• Can you show me examples of similar extensions you've completed nearby?

• Are you, or the architect you're working with, experienced in getting planning permission approved in this local authority?

Project Specifics

• Will this extension need planning permission, or does it fall under permitted development?

• What's a realistic "ceiling price" for this type of extension in my area, beyond which I likely won't recoup the cost in added value?

• How will the extension connect structurally to the existing house?

Quotes and Contracts

• Does the quote include architect drawings, building regulations costs, and all trades involved?

• What contingency should I budget on top of the quoted price? (10-15% is a common recommendation, since older properties often reveal extra work once opened up)

Guarantees and Insurance

• What insurance do you hold, and can I see a current certificate?

• What guarantee or warranty do you offer on the completed work?

• Will I receive a building regulations compliance certificate once the work is finished?