Thinking about extending your home? One of the first questions most homeowners ask is: How much is this going to cost me? While every project is unique, this blog will give you a clear picture of what to expect when budgeting for a house extension in Kent.
What Affects the Cost of a House Extension?
Several factors can influence the final price of your extension:
- Size and complexity: Larger extensions or those with intricate designs naturally cost more.
- Single vs double-storey: A second storey doesn’t double the price but does increase structural and planning requirements.
- Site access: Limited access can slow progress and increase labour costs.
- Level of finish: Basic finishes are more affordable, while high-end kitchens, bathrooms and fixtures add to the total.
- Planning and regulations: You’ll need to factor in planning applications, structural drawings, and building control fees.
Typical Price Ranges in Kent (As of 2025)
While prices vary, here are ballpark figures:
- Basic single-storey extension: £1,800 – £2,000 per m²
- Mid-range finish: £2,000 – £2,250 per m²
- High-spec or complex designs: £2,250 – £2,500+ per m²
So, for a 30m² single-storey extension, you could expect a cost between £54,000 and £75,000, depending on your choices.
Add 30% or more for a double-storey extension.
Tip: Always set aside a 5-10% contingency budget to cover the unexpected.
Additional Costs to Consider
It’s easy to focus on bricks and mortar, but there are other expenses to factor in:
- Design and architectural fees
- Structural engineering reports
- Planning permission or lawful development certificates
- Upgrades to heating or electrics
- Kitchens, bathrooms, and flooring
- Party wall agreements (if applicable)
How Hargrave Construction Helps You Budget with Confidence
At Hargrave Construction & Renovations, we aim to remove the stress from budgeting:
- We offer detailed, transparent estimates from the outset
- You’ll have a single point of contact to manage variations, changes, and scheduling
- We guide you through every step — from initial idea and permissions to finishing touches
Whether you’re adding space for a growing family or creating a luxurious new kitchen, we help you invest wisely and build smart.
Ready to Talk About Your Extension?
If you’re thinking about extending your home in Kent, get in touch today. We’ll help you understand your options, costs, and timelines so you can make confident decisions from day one.