Planning a house extension is exciting, but many homeowners are unsure where to begin.
One of the first questions we hear at My Home Plans is:
"What information do you need before you can start drawing my extension?"
The answer is simple: the more accurate information available at the beginning of a project, the smoother the design process becomes.
Whether you're planning a kitchen extension, loft conversion, garage conversion or full home renovation, gathering the right information early helps produce better designs, faster planning applications and more accurate construction drawings.
Why Good Information Matters
Every successful home extension starts with understanding the existing property.
Architectural drawings are only as accurate as the information used to create them.
Accurate information helps:
Produce realistic designs
Reduce revisions
Improve planning applications
Speed up Building Regulations drawings
Help builders provide accurate quotations
Reduce costly mistakes during construction
1. The Full Property Address
The first thing your designer will need is the full property address.
This allows checks to be made for:
Planning history
Previous extensions
Conservation Areas
Listed Building status
Flood zones
Local authority requirements
Each property has its own planning context, so this information is essential.
2. Existing Floor Plans
Existing plans provide an excellent starting point.
Useful plans include:
Estate agent floor plans
Previous planning drawings
Original house plans
Building Regulation drawings
CAD files
PDF drawings
Even estate agent plans can significantly reduce survey time.
3. Property Photographs
Clear photographs allow designers to understand the existing building.
Helpful images include:
Front elevation
Rear elevation
Side elevations
Garden
Roof
Internal rooms
Kitchen
Bathrooms
Loft
Garage
Good lighting and wide-angle photographs provide the best reference.
4. Basic Measurements
Although a professional measured survey provides the greatest accuracy, homeowners can often provide useful measurements during the early design stage.
Helpful dimensions include:
Overall property width
Garden length
Room sizes
Ceiling heights
Window locations
Door positions
These measurements help establish an initial design before detailed surveys are completed.
5. Your Ideas
The design process works best when homeowners explain how they want to live in the finished space.
Examples include:
Larger kitchen
Open-plan living
Utility room
Home office
Additional bedroom
En-suite bathroom
Children's playroom
Better garden connection
More natural light
Understanding how you want to use the space is often more important than deciding exactly where every wall should go.
6. Inspiration Images
Many homeowners already have ideas saved from:
Houzz
Magazine articles
Builder websites
Friends' extensions
These images help communicate the style, materials and overall appearance you're aiming for.
7. A Rightmove Property Link
If your property has previously been marketed online, a Rightmove or estate agent listing can be extremely useful.
These listings often include:
Existing floor plans
Internal photographs
External photographs
Garden images
Room descriptions
This information provides valuable context during the early design stage.
8. Structural Information
If you already know about structural elements, sharing this information can save time later.
Examples include:
Chimney breasts
Steel beams
Load-bearing walls
Previous structural alterations
Drainage locations
Structural engineers will still provide calculations where required, but existing knowledge helps during initial design.
9. Your Budget
Having a realistic budget allows the design to match your expectations.
Budget affects decisions such as:
Extension size
Roof design
Glazing
Structural complexity
Internal finishes
Construction methods
Designing within budget often creates a more successful project than designing without financial constraints.
10. Your Timescale
Knowing when you'd like to begin construction helps plan the design programme.
Typical stages include:
Existing survey
Concept design
Planning drawings
Planning application
Building Regulations
Structural engineering
Builder quotations
Construction
Starting early usually provides greater flexibility.
What Happens After the Information Is Received?
Once the information has been gathered, the design process usually follows these stages:
Stage 1 – Existing Drawings
The existing property is accurately drawn.
Stage 2 – Concept Design
Initial layout options are developed to explore the best use of space.
Stage 3 – Planning Drawings
The preferred design is developed into a professional planning drawing package.
Stage 4 – Planning Application
Where required, drawings are submitted to the local authority for assessment.
Stage 5 – Building Regulation Drawings
Technical construction drawings are prepared for Building Control approval.
Stage 6 – Structural Engineering
Structural calculations are completed where beams, openings or other structural alterations are proposed.
Why Homeowners Choose My Home Plans
At My Home Plans, we've developed a straightforward online process that allows homeowners across the UK to begin their project without unnecessary delays.
We regularly help clients with:
House extensions
Loft conversions
Garage conversions
Internal alterations
Planning application drawings
Building Regulation drawings
Measured building surveys
Residential design advice
Because much of the information can be shared digitally, homeowners can often begin the design process without waiting weeks for initial appointments.
Frequently Asked Questions
Can I start with estate agent floor plans?
Yes. Estate agent plans are often an excellent starting point and can reduce survey time.
What if I don't have accurate measurements?
That's not a problem. We can advise what measurements are most helpful or arrange a measured survey where required.
Do I need to know exactly what I want?
No.
Many homeowners simply know they need more space. Developing the best layout is part of the architectural design process.
Can everything be done remotely?
In many cases, yes.
Using photographs, existing plans, measurements and online communication, many residential projects can be progressed efficiently without repeated site visits.
Start Your Home Extension with Confidence
Every successful extension begins with good information.
By collecting the right plans, photographs, measurements and ideas at the beginning of the project, homeowners give themselves the best opportunity to achieve a practical, attractive and cost-effective design.
Whether you're extending your kitchen, converting your loft, redesigning your layout or renovating your entire home, professional planning starts long before construction begins—and it starts with understanding your property.
At My Home Plans, we're here to guide you through every stage of that journey.