Our Services
What We
Offer
01
Residential Extensions in Cornwall
Extending your home is one of the most effective ways to gain additional space while remaining in a location you love. KS Architects specialise in residential extensions across Cornwall, delivering carefully considered designs that respond to planning policy, site constraints, and the practical realities of construction.
Every extension project begins with a clear understanding of how you want to use your home. We focus on improving natural light, spatial flow, and energy efficiency while ensuring the proposal sits comfortably within its surroundings.
Our experience with local planning authorities allows us to develop proposals that are robust, well-reasoned, and more likely to achieve approval.
From early feasibility studies through to planning, technical design, and construction support, we guide you through each stage with clarity and confidence.
If you are considering a house extension in Cornwall, KS Architecture can help you unlock the full potential of your property.
03
Planning Permission Advice in Cornwall; Do I Need Planning Permission for an Extension?
Planning permission is one of the most common concerns for homeowners considering an extension or refurbishment. Requirements vary depending on location, property type, and the scale of development.
KS Architecture provide clear, professional planning advice tailored to Cornwall’s local planning policies. We assess whether proposals fall within permitted development or require full planning permission and develop strategies accordingly.
By addressing planning considerations early, we reduce risk and avoid unnecessary delays, helping projects move forward smoothly.
05
Our Architectural Process
Our process is structured, transparent, and client-focused.
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Initial Consultation & Feasibility
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Concept Design
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Planning Applications
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Technical Design & Building Regulations
This staged approach provides clarity at each step and ensures informed decision-making throughout the project.
02
House Refurbishments & Renovations
Refurbishment projects require a detailed understanding of existing buildings and how they can be adapted for modern living. KS Architecture provide architectural services for residential refurbishments and renovations throughout Cornwall, improving comfort, functionality, and long-term performance.
Our approach often combines internal reconfiguration with targeted extensions or upgrades, allowing clients to maximise space without unnecessary complexity. We pay particular attention to daylight, circulation, and energy efficiency, ensuring homes are both practical and enjoyable to live in.
Whether you are modernising a period property or improving an underperforming home, we provide clear design solutions supported by robust technical detailing.
04
Do I Need an Architect for a House Extension?
While it is not a legal requirement to appoint an architect, professional architectural input can significantly improve the outcome of a project.
An architect brings design expertise, planning knowledge, and technical understanding, helping you avoid costly mistakes and achieve a better-quality result.
KS Architecture support clients from initial concept through to completion, ensuring proposals are practical, compliant, and tailored to your needs.
06
Costs & Feasibility for Home
Understanding costs early is essential.
KS Architecture provide feasibility advice to help clients assess budget, planning constraints, and technical considerations before committing to a project.
Early-stage design allows you to explore options, test layouts, and make informed decisions, reducing risk and improving value.
Understanding Our Fees
Hiring an architect is an investment — and we believe you should understand what you’re paying for and why, before committing to anything.
How we structure our fees
We typically work on a percentage of the construction cost, so our fee scales with the complexity and scope of your project. For residential extensions and refurbishments, fees for a full-service are typically around 8% of the construction cost — though this varies depending on the level of involvement you need.
For clients who want drawings for planning permission only, we can agree on a fixed fee for that stage. This gives clarity upfront before you commit to the full project.
What does that look like in practice?
Project type, Typical build cost, Indicative fee range
Single-storey extension £80,000–£150,000 £6,400–£12,000
Full refurbishment £100,000–£200,000 £8,000–£16,000
New build £250,000–£400,000 £20,000–£32,000
Fixed fees
Planning drawings & application: from £3,000
Building regulations drawings: from £5,000
Full service (planning + building regs): from £8,000
These are indicative figures. Every project is different — your fee will be confirmed in writing before any work begins.
As a small RIBA Chartered practice, we offer a personal, hands-on service at fees that reflect our lower overheads — without compromising on design quality or professional standards.
What’s included
Our fees cover the full design and planning process — from initial feasibility through to planning permission and building regulations. A full service covers all RIBA work stages, while a planning-only service stops at Stage 3, giving you flexibility depending on how much support you need.
Additional consultant fees (structural engineer, energy assessor) are separate, and we’ll advise you on likely costs early on.
What’s not included
∙ Planning application fees (paid directly to Cornwall Council)
∙ Structural engineer and other specialist consultants
∙ Building regulations fees
The honest answer: we’ll tell you early
We offer an initial consultation to understand your project, assess feasibility, and give you a clear fee proposal — before you’re committed to anything. There’s no obligation and no surprises.
