How long does an extension take?

We estimate on average most builders will take between 10 and 12 weeks to build a home extension, although depending on the size and specification of the project these timings can sometimes take slightly longer.

Depending on the size and complexity of your project, the length of time can vary considerably. A small extension may take only 3 months, a larger extension maybe 6 months. A full new build large house on a complex site could easily take 12-18 months.

Two of biggest things that can regularly add time onto the length of construction are; bad weather and changes to the design. The weather is a difficult one to predict, as building in the UK you can have lots of rain any time of year! It is advisable to avoid starting a build during the winter as cold frosty conditions are not good for building in.

Many clients make changes to the design once the construction has started. This is fine but you must be prepared for additional costs and a delayed completion if work has to be redone.

Another common delay is not having an architectural designer because this can lead to simple errors that result in delays further down the road.

We hope this has answered many of your initial questions and queries that you will experience when considering your proposed project.

Be sure to check our other blog posts in this series Architectural Designer feesPlanning Permission and Extension Fees.

“Had Paul design our extension, the builders were really impressed with the attention to detail and the design practicality. The extension is now complete and has vastly improved our home. Thanks, Paul, really good job! I would definitely recommend.”

Lee Smith
16th December 2017

If you would like to discuss your potential project in more detail please contact us at Lyson Architecture on 02476 629192 or info@lysonarchitecture.co.uk

We look forward to hearing from you.

Coventry Office


Lyson Architecture
Unit 7, Colliers Way
Spring Hill Industrial Estate,
Coventry, CV7 8HN

T: 02476 629192
E: info@lysonarchitecture.co.uk

London Office


Lyson Architecture
Harrow Business Centre, 429-433 Pinner Road
North Harrow, Middlesex, HA1 4HN

T: 0203 974 9916
E: info@lysonarchitecture.co.uk

Opening Times


Mon – Fri: 9.00am to 5.30pm
Sat – Sun: Closed



Follow Us


Follow Us On Facebook  Follow Us On Twitter  Watch Us On YouTube  Follow Us On LinkedIn  Pintrest  Find Us On Instagram

©Copyright 2018 Lyson Architecture Ltd. All Rights Reserved. Incorporated in England. Registered No. 09981953.

Web Design & SEO by apicalmedia

Architectural Designers Coventry | Architectural Designers Warwickshire | Architectural Designers Nuneaton | Architectural Designers Balsall Common | Architectural Designers Meriden | Architectural Designers Solihull | Architectural Designers Stratford upon Avon | Architectural Designers Kenilworth | Architectural Designers Warwick | Architectural Designers Sutton Coldfield | Architectural Designers Little Aston | Architectural Designers London