Ideas, evidence & lessons from practice.
The 0405 Journal explores housing, residential design, heritage and technical delivery. Each article begins with a practical question and aims to leave something useful behind.
Latest writing.
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Can my extension have large windows and rooflights?
Large windows and rooflights need a coordinated design. Understand the opening allowance, alternative assessment routes and decisions to make before ordering.
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Can I change the construction system after planning permission?
Considering a different construction system for a housing scheme? Check planning, technical redesign and the true cost before committing to the change.
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Can I build an extension over a drain or sewer?
0405 Architecture · England · Guidance checked 6 October 2026 Sometimes, but establish the pipe’s ownership, position and relationship to the proposed foundations before committing to the design. Building over a sewer is not automatically acceptable, and a drainage issue can change the extension’s layout as well as its construction details. For homeowners in Worcestershire…
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Why are my builders’ quotes so different? How to compare extension prices properly
Different extension quotations can cover very different work. Learn how to compare exclusions, allowances and specifications before choosing your builder.
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A housing system is not a drawing library
Standard house types do not automatically create a reliable housing system. We explore how product-platform rules, configuration and controlled learning can make repeatable housing work.
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From planning permission to construction: a small housing developer’s guide
A practical guide to turning planning approval into a coordinated, buildable housing scheme, with clear responsibilities and a pre-start review checklist.
A question worth exploring?
If there is a housing, heritage or technical subject you would like us to examine, start a conversation.