Dreaming of More Space? Let’s Talk About Cost.
If you’ve been thinking about creating more space — perhaps a brighter kitchen, a new home office, or an extra bedroom — you’re not alone.
At Jagya Architecture, we’ve worked with many homeowners across Coventry, Leamington Spa, Kenilworth and the wider Warwickshire area who love their homes but need them to work harder.
One of the first questions we’re always asked is simple:
“How much does a house extension actually cost?”
The answer depends on a few key factors — your design, materials, and site — but with some expert insight, you can plan with confidence.
Average Cost of a House Extension in 2025
| Type of Extension | Typical Cost per m² | Details |
|---|---|---|
| Basic / Standard Finish | £1,800 – £2,200 | Straightforward design, standard finishes |
| Mid-Range | £2,400 – £2,800 | Higher-quality materials, bespoke details |
| High-End / Bespoke | £3,000 – £3,800+ | Premium glazing, complex structures, luxury finish |
In Coventry and Warwickshire, costs generally sit between £2,000–£2,800 per m² for most modern residential projects, depending on the specification and complexity.
💡 Example: A 25m² kitchen extension in Coventry could cost between £55,000 and £75,000.
What Influences the Cost of Your Extension
1. Size & Structure
The bigger and more complex the extension, the higher the overall build cost.
Simple single-storey rear extensions cost less per square metre than two-storey builds with steelwork or roof alterations.
2. Materials & Specification
Brickwork, render, or cladding? Aluminium bi-folds or timber windows?
Your design choices affect both budget and feel — we always help clients balance cost, aesthetics, and long-term value.
3. Access & Site Conditions
Coventry’s charming older streets and tight plots can make access tricky.
Limited delivery space or restricted parking may add some labour costs.
4. Professional Fees
Architectural, structural, and planning fees typically account for around 10–15% of total project cost — but good design and proper planning prevent costly surprises later.
👉 Learn more about our design process →
Planning Permission & Regulations in Coventry
Some extensions fall under Permitted Development, meaning you may not need full planning permission.
However, Building Regulations approval is always required to ensure your project meets structural and energy standards.
If your property is within one of Coventry’s conservation areas (for example, Earlsdon or Stoke Park), permissions may be more specific — and that’s where our local experience really helps.
Hidden Costs to Budget For
Even with good planning, it’s worth keeping a small contingency aside for the unexpected.
Common extras include:
- Groundworks & Drainage Adjustments
- Structural Steel or Engineering Design
- Upgrading Electrics & Heating
- Interior Finishes (kitchens, flooring, lighting)
- Building Control & Planning Fees
🧾 We always recommend allowing a 10–15% contingency.
Timeline: How Long Does It All Take?
| Stage | Typical Duration |
|---|---|
| Design & Planning | 4–8 weeks |
| Permissions & Approvals | 6–10 weeks |
| Tender & Contractor Selection | 2–4 weeks |
| Construction (Single Storey) | 12–16 weeks |
| Construction (Two Storey) | 16–24 weeks |
Our team manages the design, planning, and build coordination — helping your project stay efficient and stress-free.
Do Extensions Add Value in Coventry?
Absolutely.
A thoughtfully designed extension can increase your home’s value by 10–25%, depending on location and design quality.
In Coventry, we’re seeing strong demand for:
- Kitchen & Dining Extensions — the heart of modern family life
- Open-Plan Living Spaces — perfect for entertaining
- Garden Rooms & Home Offices — increasingly valuable post-pandemic
✨ Design isn’t just about space — it’s about how that space makes you feel.
👉 See examples of our recent residential projects →
How to Save Money Without Compromising Design
- Keep the form simple — fewer corners, fewer costs
- Choose readily available materials
- Make design decisions early to avoid mid-build changes
- Work with a local architect who understands regional pricing and planning
At Jagya Architecture, our goal is to design intelligently, ensuring every pound you invest adds value and purpose.
Why Choose Jagya Architecture
We’re a Coventry-based architecture studio specialising in residential extensions and renovations across Coventry, Warwick, Leamington Spa, Rugby and the wider Warwickshire area.
We help homeowners:
- Maximise light, space, and functionality
- Navigate planning and building regulations smoothly
- Manage costs with precision
- Create homes that feel timeless and tailored
🗓️ Ready to start your project? Book your free consultation →
Key Takeaways
✅ Average house extension cost in Coventry (2025): £2,000–£2,800 per m²
✅ Always include 10–15% contingency
âś… Planning permission not always needed, but Building Regs are
✅ Well-designed extensions can add 10–25% to your home’s value
âś… Local architects help you save time, stress, and money
Final Thoughts
If you’re planning a house extension in Coventry or nearby towns such as Kenilworth, Leamington Spa or Warwick, start by understanding your budget — but design with your lifestyle in mind.
Great design isn’t about spending more — it’s about spending wisely.
Thinking about extending your Coventry home?
Let’s design a space that brings more light, flow, and joy to everyday living.
👉 Book your free consultation with Jagya Architecture →