01
Site Visit & Brief
We visit your property or review survey information, take a full brief and assess what is achievable under planning policy.
Residential Design
Single & Double Storey Extensions
Expand your home without the stress of moving. We design and manage planning approval for single and double storey extensions across England and Wales.
98%
Approval Rate
5-10
Day Turnaround
Fixed
Fee
What It Involves
Extensions Designed for How You Actually Live
A well-designed extension does more than add square footage - it transforms how you use your home. Whether it is an open-plan kitchen-diner, a utility room, a ground-floor bedroom or a first-floor master suite, we design extensions that work in practice.
We take a planning-first approach: before drawing begins, we review what your local authority is likely to approve, so your design has the best possible chance of success first time.
From initial design through to planning approval and full building regulations drawings, we manage the entire process. Most extension drawing packages are ready within 5-10 working days.
Who This Is For
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Homeowners wanting to extend their kitchen, add a utility or create additional bedrooms
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Those looking to add a rear, side or wraparound extension
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Clients wanting an open-plan ground-floor living space
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Properties needing a first-floor extension above an existing garage or single storey
What’s Included
A complete, fixed-fee package - no hidden extras.
Planning-First Design
We review permitted development allowances and local planning policy before drawing begins.
Existing & Proposed Drawings
Full set of architectural drawings including floor plans, elevations, roof plan and sections.
Planning Application
Householder or full planning application prepared and submitted, including all supporting documents.
Building Regulations Package
Full technical package for Building Control including structural coordination, insulation and drainage.
Permitted Development Advice
Confirmation of whether PD rights apply and, if so, preparation of a Lawful Development Certificate application.
How It Works
A clear, structured process from first contact to final delivery.
02
Design & Drawings
We design the extension and produce a full architectural drawing package in 5-10 working days.
03
Planning Submission
We submit the planning application and manage all council correspondence through to approval.
Why Trust Apex Planning?
Over 10+ years, 500+ projects and a 98% first-time planning approval rate. We prepare every application to the standard required to succeed - first time.
Our Guarantee
98% Approval Rate
Thorough preparation and local authority knowledge make the difference on every submission.
5–10 Day Turnaround
Fast, accurate drawing packages so your project keeps moving without delays.
Fixed Fees
One price agreed upfront. No surprises, no hidden extras, no upsells.
Free Revisions
Council amendments handled at no extra charge until you have your approval.
Common Questions
Frequently asked questions about our Single & Double Storey Extensions service.
What is the maximum size of an extension under permitted development?
For a detached house, a single storey rear extension can extend up to 4 metres under standard PD rights. The limits vary by house type and location - we confirm exactly what is achievable for your property.
Do I need planning permission for a single storey extension?
Not always. Many single storey extensions fall within permitted development rights. Where PD applies, a Lawful Development Certificate gives you written confirmation.
How long does the planning process take?
Householder planning applications are typically decided within 8 weeks. Permitted development confirmation via a LDC takes 4-8 weeks.
