Most home projects start with a picture: a house on a plot, or an extension seen on someone else’s home. The trouble is that the picture comes before the facts. Many people commit money to design before they know what their site will allow or what the project will realistically cost. A feasibility assessment will
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Most home projects start with a picture: a house on a plot, or an extension seen on someone else’s home. The trouble is that the picture comes before the facts. Many people commit money to design before they know what their site will allow or what the project will realistically cost.
A feasibility assessment will help you identify your site’s potential and ensure the project progresses in the right order. Before anything is drawn, it asks what your plot or property can accommodate, what planning is likely to permit, and roughly what it will cost. Done early, it costs little compared with the fees and time it can save.
Understanding your site’s constraints
Every site has limits, and most of them can be recognised in advance.
Self build plots
Start with planning: the local plan, past applications on or near the site, and designations such as a conservation area or green belt. Then the site itself – any slopes, the ground conditions, protected trees, potential flood risk, drains and services. Access matters more than many think: a safe entrance onto the road can decide whether a plot is buildable at all. You also need to consider the neighbours. Overlooking, overshadowing and the scale of the surrounding homes shape how large your house can be and where it sits on the plot.
Extensions & renovations
Here, the main consideration is what your home and garden can realistically allow. Some extensions can go ahead under permitted development (PD), without a full planning application, but those rights are restricted in conservation areas and do not apply to flats. Beyond planning, the existing structure, drains and shared walls all affect whether a modest alteration or a larger one makes sense.
Balancing planning, design & budget
Planning, design and budget are not three separate checks; each one affects the other two. Planning sets the envelope – how large, how tall, how close to the boundary. Design decides how well you use it. Budget decides how much of it you can afford to build.
Change one and the others follow. A height limit might push space into the roof or a basement, which changes the cost. A sloping site adds foundation work. Even tax plays a part: new self builds will be able to reclaim VAT on eligible building materials, while most extensions pay the full 20%. Looking at all three together, at the start, avoids designing a home you cannot get approved or cannot afford.
A LynxCraft feasability study render for a 172m² self build project in Cirencester, Gloucestershire, with an estimated total build cost of £368,600
How can a feasibility study help?
A good feasibility study turns a wish list into a workable brief. It tells you what fits, where the constraints and risks sit, and what range of costs to plan for, before you pay for a detailed design.
That brief is what moves a project into concept design with confidence. Your architect starts from a realistic envelope, and your design fees go on refining the right scheme. A study can also turn up the unexpected: a plot of land that takes a larger home than assumed, or a loft conversion that works on a property where a side extension would not. Found early, those findings change decisions; found late, they change plans.
How does a feasibility study work?
Whether you’re building a new house or extending your existing property with a loft or rear extension, the principle is the same: compare your options with real numbers before you pay anyone to design one.
Lynx Copilot, from LynxCraft Group, gives you an assessment in minutes. For a plot, you enter the address and describe the home you want. It checks the site against planning and spatial data, produces a concept design that fits, flags the main planning risks and gives an indicative build cost that updates as you change the design.
A LynxCraft feasibility assessment showing a breakdown of the different cost elements based on a standard specification
For a renovation, it starts with the house you have. You draw it or pick a matching plan, and answer a few questions about its age, construction and services. Then you plan the changes – are you knocking through a wall, for example, adding an extension or a storey, or converting the loft? Lynx Copilot compares before and after line by line and flags whether you are likely to need approval and a structural engineer. You get an itemised estimate with a price range and a timeline, plus a colour-coded 3D view of what stays, what goes and what is new.
It is an early, indicative read, not a replacement for an architect — it is the step before one. When you are ready, Lynx Copilot connects you with vetted architects and builders.
Case study How a feasibility study helped this homeowner
Stephen Prescott, from Congleton in Cheshire, wasn’t sure what he wanted: a new house on his plot, or an extension to the home he already had. Every builder he asked said they would only know the cost once work began.
He tried both in Lynx Copilot and saw them side by side: what each would look like, what planning would allow and roughly what each would cost. With real figures in front of him, he realised the new home he really wanted was within what he could borrow, so he chose to build. He’s now bringing in an architect and builders with a clear brief and a budget already in hand.
A feasibility study helped this homeowner identify his site’s potential, leading to a brand-new self build project instead of an extension
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Lucy KuharLucy Kuhar is an ARB-registered architect and founder of Lumin Architects, with over a decade designing homes in London and the Home Counties. As LynxCraft’s UK Country Manager, she leads Lynx Copilot in England, helping self-builders and homeowners see what their plot or property can take before committing to design fees. For more information about LynxCraft and LynxCraft Copilot, call 07741 892549 or visit LynxCraft’s website. |
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