Defining Your Brief: Establishing Project Goals
Every successful extension project starts with a client brief, a crucial document outlining:
Your Vision – What do you want to achieve? More family space, a home office, an open-plan kitchen, or improved accessibility?
Budget – Your financial parameters will define the project’s scope and scale.
Timescales – Do you have a deadline? Consider planning approvals, contractor availability, and seasonal weather conditions.
A well-defined brief ensures your Architectural Designer can develop a plan that meets your expectations while staying within legal and regulatory requirements.
Initial Consultation & Site Assessment
Once your brief is established, an initial consultation and site visit assess the feasibility of your project. This includes:
Exploring design solutions tailored to your needs.
Reviewing planning constraints, such as conservation areas, listed building status, green belt restrictions, or Article 4 Directions.
Inspecting the site for access, drainage, structural integrity, and potential obstacles.
If your project seems feasible, you will receive a formal appointment letter, detailing:
– The scope of services provided by the designer.
– A fee breakdown for each project stage.
– Additional services such as structural engineering, party wall agreements, or flood risk assessments.
Measured Building Survey & Existing Drawings
A measured survey of your property is conducted to create accurate digital drawings, which include:
– Existing floor plans and elevations, providing a precise architectural reference.
These drawings serve multiple purposes:
– They are required for planning and building control applications.
– They help visualize spatial relationships and room dimensions.
– They act as a reference for structural analysis and contractor pricing.
Concept Design & Initial Proposals
With the existing drawings in place, the design process begins. Your Architectural Designer will develop initial sketches based on your brief, considering:
– Space planning & functionality – Ensuring efficient use of space.
– Aesthetic considerations – Maintaining architectural character.
– Integration with existing structures – Ensuring continuity in materials and form.
– Natural light, ventilation & energy efficiency – Complying with Part L of the Building Regulations.
Once a concept is agreed upon, detailed proposed plans and elevations are prepared for submission.
Planning Application Submission & Statutory Approvals
Under the Town and Country Planning (General Permitted Development) (England) Order 2015, some extensions qualify for Permitted Development Rights (PDR). However, full Planning Permission is required if:
– The extension exceeds PDR size limits.
– The property is in a conservation area, green belt, or Article 4 restricted area.
– The extension alters a listed building.
– The proposal significantly impacts neighbors’ rights to light or privacy.
If permission is required, the Architectural Designer submits the application to the Local Planning Authority (LPA). The statutory approval times are:
– 8 weeks for standard applications.
– Up to 13 weeks for major or complex applications.
Detailed Construction Drawings & Building Regulations Compliance
At this stage, technical drawings are prepared to ensure compliance with:
– Structural integrity – Load-bearing elements (may require structural engineering input).
– Fire safety – Adhering to Part B of the Building Regulations.
– Thermal efficiency – Complying with Part L (energy performance standards).
– Drainage & ventilation – Meeting Part H and Part F regulations.
A Party Wall Notice must be served to neighbour’s at least two months before work begins if the extension:
– Is within 3 meters of a neighbour’s foundation.
– Is within 6 meters and affects a 45-degree zone from their foundation.
– Affects or is built astride a shared party wall.
These detailed drawings are submitted to Building Control for scrutiny and a decision is usually received within around 5 weeks.
Specification & Contractor Tender Process
A detailed specification document is prepared, outlining:
– Scope of work – Construction tasks and expectations.
– Material selection – Ensuring quality and durability.
– Performance standards – Sustainability and energy efficiency targets.
Using a JCT Minor Works Contract or RIBA Domestic Building Contract ensures between yourselves as clients and your chosen building contractor:
– Clearly defined roles and responsibilities.
– Agreed payment terms and dispute resolution procedures.
– A formal construction timeline.
Construction Phase & On-Site Inspections
Once construction begins:
– Building Control Inspectors visit at key stages (e.g., foundation work, structural elements, drainage).
– Regular site meetings ensure quality control and adherence to design expectations.
Completion, Final Sign-Off & Certification
Upon completion:
– The Building Inspector conducts a final inspection.
– A Completion Certificate is issued, confirming compliance with Building Regulations.
Final Thoughts: Ensuring a Smooth Project
A well-planned extension minimizes stress, avoids unexpected costs, and results in a high-quality build. Working with an experienced Architectural Designer provides:
Expert guidance through planning and statutory approvals.
High-quality design and technical drawings for accurate construction.
Thinking about a residential extension? Get in touch today to discuss your project and ensure a seamless journey from concept to completion
Jbh Architectural Services 
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