Planning a Home Extension in London? Here's What You Need to Know
Expanding your home is an incredibly fulfilling way to enhance your living environment, increase property value, and sidestep the hassle of moving — particularly in London, where every square metre counts.
Whether you're dreaming of a larger kitchen, a bright family room, or a layout that flows more naturally, a thoughtfully designed extension can revolutionise how you live.
But before diving into mood boards or contacting builders, there are some crucial steps to consider.
Understand the Specific Challenges of Extending in London
Planning a home extension in London comes with unique considerations:
Limited space and close proximity to neighbours
Planning restrictions, especially in conservation areas
Access difficulties for builders and deliveries
Respecting period property features while modernising
With the right guidance and a well-considered approach, all of these can be successfully navigated.
Define Your Objectives and Must-Haves
Before engaging an architect or contractor, take time to reflect on what you truly need from your new space:
What problem am I trying to solve?
Is it more about space, light, or improving flow?
Do I need a specific room: a home office, larger kitchen, or utility space?
For some households, the goal is open-plan living; for others, it's functional separation. Clear objectives help your design team create a home that works for your lifestyle — not just a beautiful structure.
Explore Your Extension Options
London homes support a wide range of extension types. Popular options include:
Rear extensions – expand into the garden for more living or dining space
Side return extensions – ideal for Victorian terraces, using the alleyway beside the house
Wraparound extensions – combining rear and side for an L-shaped space
Double-storey extensions – add rooms above and below
Loft conversions or basement digs – add vertical square footage
Each has different implications for cost, complexity, and permissions. At Bloom Builders, we help clients evaluate the best approach for their home, budget, and goals.
Check If You Need Planning Permission
Some extensions fall under permitted development rights, meaning full planning permission isn't required. However, in London, you'll often need approval — especially if:
You live in a conservation area
You're planning major structural changes
Your project affects the appearance or footprint of the home
We take care of the entire planning process, including:
Measured surveys and design proposals
Submissions to your local council
Managing neighbour consultations (where required)
Handling Party Wall Agreements for shared boundaries
Prioritise Design, Not Just Square Footage
Bigger isn’t always better. A well-designed space can transform your home even without dramatically increasing its footprint.
Our architectural team focuses on:
Natural light – rooflights, glazing, orientation
Smart storage – integrated units and discreet solutions
Flow and zoning – creating a logical, functional layout
Materials and finishes – ensuring the extension feels cohesive and timeless
The goal is to create an environment that looks and feels like it has always belonged — not just an add-on.
Plan Your Budget Wisely (and Include a Buffer)
A well-executed extension is a major investment. Costs vary depending on:
Size and scope of work
Structural alterations (like removing walls or inserting steelwork)
Plumbing, electrics, glazing
Kitchens, bathrooms, bespoke finishes
Professional fees (planning, architectural, project management)
We recommend setting aside a 10–15% contingency fund for unexpected costs — it keeps your project moving and your stress levels low.
Work With a Design & Build Team You Trust
A successful extension isn’t just about drawings and bricks — it’s about relationships, communication, and execution.
At Bloom Builders, our full-service design and build model keeps everything under one roof. From concept and planning through to construction and handover, we manage every step with one dedicated team.
You’ll benefit from:
One clear point of contact
Aligned vision from start to finish
Accurate cost control and project timelines
A team that values quality and transparency
Final Reflections
Planning a home extension in London is an exciting opportunity to reimagine how you live. With the right design, permissions, and construction team, your current home can become your dream home — no move required.
At Bloom Builders, we specialise in bespoke architectural design, high-quality craftsmanship, and end-to-end project delivery. Whether you're planning a kitchen extension, wraparound addition, or full renovation, we're here to make it happen.
Thinking about your next move? Let’s make it an extension.
Book a free consultation with our team today.
