Double Storey Extension Plans & Drawings

Planning a two storey extension for your home? You’ve come to the right place. At AC Design Solution, we’re London-based CIAT Chartered Architectural Technologists. We’ve delivered over 10,000 UK projects. We handle everything from design concepts to building regulation drawings. This makes your extension journey smooth.

Value Engineered
12 years experience
£
Fixed Pricing
4.9
Based on 91 reviews
What You’ll Find Here
2
9
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Double Storey Extension

Planning Approved

You’ve got planning approval. Great! But your builder needs detailed construction drawings.

We transform your planning drawings into complete technical drawings. These include all technical details required for building control.

Fast Drawings

Traditional architects take weeks or months to deliver technical drawings. That’s too slow.

Our service is different. We convert your planning drawings to building control ready drawings quickly. No long waits.

Fixed Price Guarantee

No hidden costs here. We transform your planning drawings to building regulations for a fixed price.

The price we quote is exactly what you pay. Simple. You can trust our pricing and budget properly.

Double Storey Extension Pricing 2025

The cost of a double storey extension in 2025 includes both design fees and construction costs. Here’s our transparent pricing:

MCIAT qualified drawings

5-10 day delivery guaranteed

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TWO STOREY SIDE

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FROM

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Redraw CAD files into 3D typical construction details and wall types. Complete building regulations drawings for ground floor extensions.

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Rear Extension

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FROM

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Redraw CAD files into 3D software,

two building sections with detailed callouts of relevant areas,

wall types, and fire plans

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WRAPAROUND

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FROM

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Everything in single storey + additional sections, fire layout plans, set out drawings, structural engineer coordination, detailed callouts

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FRONT & BACK

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INDIVDUAL

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Full construction drawings, fire strategy plans, detailed wall and floor types, coordinate set out, Stage 4 coordination for complex basement projects

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CALL US TODAY ON 020 8152 4006

Why Choose Our Double Storey Extension Service?

MCIAT QUALIFIED TECHNICAL DRAWINGS

We’re not just general designers — we’re MCIAT qualified specialists. That means your drawings are compliant with the highest professional and technical standards.

COMPLETE SUBMISSION + REVISIONS INCLUDED

We handle planning permission applications. We do detailed building regulation for double storey extension submissions. We cover every technical aspect. Our service includes site analysis. It covers concept design and applications. You get technical drawings for your extension project.

Smooth Approvals Process

Our 98% first-time approval rate with building control means your house extension moves forward. No delays occur. We understand local planning authorities. We know permitted development rights.

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Client Stories

Don’t just take our word for it – hear directly from satisfied clients about their experience working with us. These real stories demonstrate why businesses trust us to deliver outstanding results every time

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Two Storey Extension Planning Permission & Permitted Development Guide

Understanding whether you need planning permission for your double storey extension is crucial. Single storey extension projects are different. Most two storey extension work requires full planning permission. They don’t fall under permitted development rights.

Building a Double Storey Extension: Costs and Planning Requirements

When designing a double storey extension, the cost to build varies significantly. Size matters. Specification matters. Location matters too. Planning approval often depends on integration. How well does your proposed extension fit with the existing house? How does it affect neighbouring properties? Planning authorities assess each extension project individually.

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Our Building Regulation drawings include property-specific sections — not generic one-size-fits-all details.

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We include full details for flat roof lights, showing upstand, insulation, and waterproofing all tailored to your build.

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Only maker women’s sexy pointed toe stiletto heel pumps party court shoes.

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Need Planning Permission or Permitted Development Rights?

Can you build a house extension without planning permission? Unfortunately, most 2 storey extension work requires full planning permission. This is due to their scale and impact. The original house is affected. The surrounding area matters too.

Permitted Development Rights for Extensions

Single storey extension projects often qualify under permitted development rights.

Double storey extensions rarely meet permitted development criteria

The extension cannot exceed specific size limits to qualify

You may be able to build under permitted development. This applies to smaller one storey projects

When You Need Planning Permission

Most 2 storey extension work requires approval from planning authorities

Extensions in a conservation area have additional restrictions
Listed building consent may be required. Heritage properties need this

Two Storey Extension Ideas: Designing a Double Storey Extension

When designing a double storey extension, consider integration. How will the new extension work with your original house? The extension should match the architectural character. Contemporary living spaces are still provided.

Popular Double Storey Extension Ideas:

  • L-shaped configurations maximising corner plots
  • Wrap-around designs combining rear and side extensions
  • Split-level designs working with sloping sites
  • Open-plan ground floors with private first-floor accommodation

Design Principles:

  • The volume of the extension should feel proportionate. The original house sets the scale.
  • Natural light optimization throughout both floors
  • Garden access from ground floor living areas
  • Privacy considerations for first-floor windows

 

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The steps

Adding a Two Storey Extension: Planning Approval Process

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Adding a two storey extension requires careful navigation. Planning requirements must be met. Our team handles the complete planning process. We work with local planning authorities. We go from initial application to full planning permission.

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all documents submitted, plans os plans, D&A Statement

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Considering a Two Storey Extension?

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If you’re considering a two storey extension, our comprehensive service covers every aspect. We go from initial concept to approval. We specialize in creating extensions. These enhance both the original house and property value. Storey extensions are an increasingly popular way to add space. Moving home is avoided.

Our Complete Service:

Initial feasibility assessments for your extension project

Concept design development

Planning permission applications to local planning authorities

Building regulation submissions

Construction support and guidance

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Double Storey Extension Take: Project Timeline

How long does a two storey extension take from concept to completion? The total timeline for your extension project typically spans 4-8 months. This includes design, planning, and construction phases. A storey extension to your home requires careful planning. Each phase needs attention.

Complete Project Timeline:

Design development: 2-4 weeks

Full planning permission: 8-12 weeks

Building regulation approval: 4-6 weeks

Construction: 12-24 weeks

Factors Affecting Timeline:

Planning complexity
Building regulation approval process
Weather conditions during construction
Availability of materials and contractors

Navigate the Planning Process Successfully

Our expertise in double storey extensions helps clients navigate the planning process efficiently. We work with local planning authorities. We understand local planning requirements. We design extensions that gain approval. Obtaining planning permission requires professional expertise. Local knowledge matters too.

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  • Early engagement with planning authorities
  • Comprehensive neighbour consultation
  • High-quality design submissions
  • Professional planning statements
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  • Overlooking and privacy concerns
  • Visual impact on street scene 
  • Compliance with local design guides
  • Heritage and conservation area requirements
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The combination of streamlined processes, reduced overheads, and efficient digital workflows means faster delivery at lower costs.

Our Process

Specialized Services

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Types of Double Storey Extensions vs Single Storey Options

When considering a two storey extension, many homeowners compare options. They look at types of double storey extensions. They compare these to single storey extension alternatives. A storey extension can vary significantly in complexity. Requirements differ compared to one storey projects.

Double Storey Extension Cost vs Single Storey:

  • Two storey extension projects typically cost more upfront. But they provide better value per sqm.
  • Single storey extension work often qualifies for permitted development rights.
  • Double storey house extension projects usually require approval. Local planning authorities handle this.

Space Benefits:

  • A two storey extension creates space on both floors. Ground and first floors both benefit. This compares well to a single storey.
  • Single storey extensions maximise garden retention. But they limit vertical space.
  • Double storey house extensions work well for growing families. Multiple rooms are needed.

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Double Storey Rear Extension Options

A double storey rear extension is the most popular choice. Terraced house properties suit this approach. These storey rear extensions typically extend 6-8 metres. They start from the original house. They create substantial additional living space. Double storey rear extensions work particularly well. You need to maximise space while maintaining garden access.

Key Considerations for Double Storey Rear Extensions:

  • Planning rules limit how far your storey extension can project. It starts from the original house.
  • The extension comes within two metres of any boundary. This requires careful design.
  • Double storey rear extension work must consider neighbour impact. Approval from planning authorities is needed.

Design Features:

  • Ground floor: open-plan kitchen-dining areas with garden access
  • First floor: bedroom suites or home office spaces
  • Seamless integration with the original house character

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Double Storey Side Extension Solutions

A double storey side extension works well for detached properties. Side access is needed. These extensions maximise narrow plots. They create significant additional space for the existing house. When you build a two-storey extension on the side of your property, this approach suits properties. Adequate side space is required.

Planning Considerations:

  • Double storey side extension work often faces the “two-storey rule” restrictions. Local planning authorities set these.
  • The extension must not exceed specific proportions. Neighbouring properties are compared.
  • Planning approval depends on maintaining adequate spacing. This is from the original house.

Design Benefits:

  • Creates wider room layouts on both floors
  • Allows for larger kitchen-dining areas downstairs
  • Provides additional bedrooms or bathrooms upstairs

A double storey side extension typically requires planning permission. This is due to its visual impact. The street scene matters. Neighbouring properties are affected.

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Adding a Double Storey Extension: Common Questions

All double storey extension projects form part of our wider architectural services offering

Q. How much does it cost to build a double storey extension?

The cost in 2025 typically ranges from £1,800 to £2,500 per square metre for construction. Add £3,000-£5,000 for design and planning. A typical 40m² extension costs £70,000-£100,000 to build. House extension costs vary based on specifications and location.

Q. Do I need planning permission for a two storey extension?

Yes, most double storey extensions require full planning permission. Local planning authorities handle this. Unlike single storey extension projects, two storey extension additions rarely qualify for permitted development rights. This is due to their visual impact and scale.

Q. Can I get planning permission under permitted development rules?

Most homeowners cannot build a 2 storey extension under permitted development. The planning rules limit the scale and impact of extensions. Only certain projects qualify for permitted development rights.

Q. How long does a storey extension take to complete?

From initial design to completion, most extension project work takes 6-9 months. This includes 2-4 weeks design. Add 8-12 weeks full planning permission. Then 3-6 months construction.

Q. What about extensions in a conservation area?

Extension project work in conservation areas faces additional restrictions. Planning authorities impose these. Most require full planning permission regardless of size. Designs must preserve the area’s historic character.

Q. How does the cost of a single storey compare?

A single storey extension typically costs £1,500-£2,000 per square metre. While cheaper per square metre compared to a single storey, double storey extensions often provide better overall value. This is for larger space requirements.

Q.What planning approval do I need?

Most two storey extension work requires full planning permission. Local planning authorities handle this. We handle the complete application process. This goes from initial submission to planning approval.

Q. Can the extension exceed certain limits?

Yes, planning rules specify maximum sizes for extensions. A storey extension can project certain distances. This is from the original house. This depends on the land around the original house. Local planning policies matter too.

Expert Two Storey Extension drawings advice

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