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Cost for Extension and Loft Conversion
How much would it cost to do plans for loft conversion and 1m extension?
Expert Trade Answers
"Hi ,
Happy to help you will not require architect drawing s for a loft conversion if no steels or supports are required, building an extension of 1 m would be permitted development, for which drawings would need to be submitted."
Happy to help you will not require architect drawing s for a loft conversion if no steels or supports are required, building an extension of 1 m would be permitted development, for which drawings would need to be submitted."
Answered on 28th Jan 2026 - Member since Apr 2023 -
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"Hi there,
Depending on the Project this may change, but a standard cost i can give now is around £1800 to get you through the entire planning stage + Design and Layout.
Let me know if youd like to discuss further about the project
Alp"
Depending on the Project this may change, but a standard cost i can give now is around £1800 to get you through the entire planning stage + Design and Layout.
Let me know if youd like to discuss further about the project
Alp"
Answered on 28th Jan 2026 - Member since Jun 2023 -
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"Hi Gita, the cost of preparing plans for a loft conversion and a small (circa 1m) extension can vary depending on the property type, complexity and the level of service required.
As a guide, our fees typically start from around £2,000–£3,000 for measured survey, design development, and planning drawings for a combined loft conversion and modest extension. If you also require building regulations drawings, structural coordination, or planning submission, this would be priced separately once we understand the scope in more detail.
We would be happy to provide a fixed fee quotation following an initial no obligation discussion and review of the property."
As a guide, our fees typically start from around £2,000–£3,000 for measured survey, design development, and planning drawings for a combined loft conversion and modest extension. If you also require building regulations drawings, structural coordination, or planning submission, this would be priced separately once we understand the scope in more detail.
We would be happy to provide a fixed fee quotation following an initial no obligation discussion and review of the property."
Answered on 28th Jan 2026 - Member since Jul 2025 -
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