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A house extension isn’t just about adding space — it’s about creating a home that works better for you.
At Big Discount Plans, we design extensions that feel natural, flow beautifully and add real, lasting value to your property.

Our approach is simple:
We listen to what you want, understand how you live, and design a space that genuinely improves your everyday life.

House Extensions

A Design Focused on You

Before we start designing your extension, we look at how your home works day-to-day. This helps us create a layout that’s practical, efficient and comfortable.

Daylight & window placement

We assess garden orientation, existing shadows, rooflines and natural light patterns to position windows, doors and rooflights in the most effective spots.

Using your new space

Whether the extension is for a bigger kitchen, dining area, workspace or family room, we design it to suit its actual purpose — not a generic layout.

Kitchen workflow

If the extension includes a kitchen, we plan it around real use: cooking zones, storage needs, appliance placement, working space and safety clearances.

Movement & flow through the home

Whether the extension is for a bigger kitchen, dining area, workspace or family room, we design it to suit its actual purpose — not a generic layout.

Entertainment & family habits

If you regularly host, need more seating, or want better visibility of children, we adapt the layout to suit how your household actually functions.

Work-from-home or study needs

If you need a desk area or a quieter corner, we design the extension so it can accommodate flexible working or study without disrupting the main space.

Planning a house extension in Greater London follows a fairly predictable timeline. Here’s what you can expect from start to finish:

What's the Process?

Survey (Week 1)

We visit your property, assess the site and take detailed site measurements.

Design & Drawings (Weeks 1–2)

Your extension plans are prepared, including layouts, elevations and planning-compliant design features.
You review the drawings, and we make any adjustments needed.

Application Submission (End of Week 2)

Once finalised, we submit your application to your local council and act as the agent on your behalf.

Council Assessment (Weeks 3–10)

Most planning applications take 5–8 weeks to process.
During this period, the council validates the application, consults neighbours and reviews the design.
If they request minor amendments, we handle these promptly.

Planning Decision (Weeks 8–10)

You receive a decision notice confirming approval. If the council requires final tweaks, we revise and resubmit without delay.

Building Regulation Drawings (Weeks 10–12)

Once planning is approved, we move into the technical stage.
Detailed building regulation drawings and structural calculations are completed, ready for construction.

Building Control Approval (Weeks 12–14)

Your drawings are submitted to Building Control (either via the council or an approved inspector).
Confirmation typically takes 1–3 weeks, depending on the route chosen.

Side Extensions

A side extension turns unused side land into valuable living space. It’s perfect for widening narrow layouts, adding a utility room, or improving kitchen flow.

Rear Extensions

Rear extensions are ideal for creating a larger kitchen or open-plan family space. They extend into the garden and can completely modernise the ground floor without major disruption.

Double-Storey Extensions

A double-storey extension adds space both upstairs and downstairs, giving room for extra bedrooms, bathrooms or a larger master suite — ideal for growing families.

Wrap-Around Extensions

Whether the extension is for a bigger kitchen, dining area, workspace or family room, we design it to suit its actual purpose — not a generic layout.

Garden Rooms & Outbuildings

A garden room offers extra space without altering the main house. It’s perfect for a home office, gym, studio or private guest accommodation.

Rear Infill Extensions

Great for older terraced homes, infill extensions make clever use of the small side courtyard to improve kitchen layouts and overall ground-floor circulation.

What's Possible?