Permitted Development Rights: Extending Without Planning in Hampshire (2026)

Key Takeaway

Check permitted development rights for Hampshire extensions, including size limits, exceptions and when a certificate or planning application may be needed.

Compare your options: Our companion guide, permitted development vs planning permission, explains how to choose a route and what each involves.

Extending Without Planning Permission in Hampshire (2026 Guide)

Some Hampshire homeowners can extend under Permitted Development Rights (PDR) without a full planning application, provided the project meets all relevant limits and conditions. Check your property's planning history and current council requirements before relying on PD rights. This guide explains the key considerations for Winchester, Basingstoke, Southampton and beyond:

What Are Permitted Development Rights?

Permitted Development Rights allow certain types of home improvements without planning permission, subject to specific conditions and limitations. In Hampshire, this includes:

• Single-storey rear extensions up to 6m or 8m
• Two-storey extensions up to 3m
• Loft conversions
• Conservatories and porches
• Outbuildings and garages

Single-Storey Rear Extensions Under Permitted Development

Terraced and Semi-Detached Houses (Most Winchester/Southampton Homes)

• Maximum depth: 6m from original rear wall
• Maximum height: 4m
• Eaves height: Maximum 3m
• Side boundaries: No part can project beyond building line
• Materials: Must be similar to existing house
• Prior Approval: Required if between 3m-6m depth

Detached Houses (Common in Basingstoke Suburbs)

• Maximum depth: 8m from original rear wall
• Maximum height: 4m
• Eaves height: Maximum 3m
• Side boundaries: Must be 2m+ from boundary if over 2.5m high
• Materials: Must be similar to existing house
• Prior Approval: Required if between 4m-8m depth

Two-Storey Extensions Under Permitted Development (Limited)

• Maximum depth: 3m from original rear wall (all house types)
• Maximum height: Not higher than existing house ridge
• Eaves height: Not higher than existing eaves
• No balconies: Cannot include balconies or raised platforms
• Side windows: Upper floor side-facing windows must be obscure-glazed
• Side boundaries: 7m+ from opposite boundary

Hampshire reality: Most families want 6m+ depth for two-storey extensions, so planning permission is usually required anyway.

What is Prior Approval for Hampshire Extensions?

Larger single-storey rear extensions require Prior Approval from the council:

When Prior Approval is Needed

• Terraced/semi-detached: 3m-6m depth extensions
• Detached: 4m-8m depth extensions

What Prior Approval Involves

• Neighbour notification: Council notifies adjoining neighbours (21 days)
• Neighbour objections: If objections raised, council assesses impact
• No design assessment: Council doesn't judge appearance
• Timeline: 6 weeks maximum (faster than 8-12 week planning)
• Cost: Check the current Prior Approval fee with the relevant local planning authority.
• Building regs still needed: Separate application required

Permitted Development Limits That Catch Hampshire Homeowners Out

1. Coverage Limit

• No more than 50% of original garden can be covered by extensions/outbuildings
• "Original" means as existed in 1948 or when first built if after
• Includes existing conservatory, garage, shed, extension
• Catches out homeowners with previous extensions

2. Height Restrictions Near Boundaries

• Within 2m of boundary: maximum 2.5m height for single-storey
• Catches out narrow Hampshire terraced gardens
• Often makes side returns impossible under PDR

3. Material Matching

• Materials must be "similar in appearance" to existing
• Can't use render on brick house without planning
• Can't use modern materials on period properties

Where Permitted Development Rights DON'T Apply in Hampshire

Conservation Areas

PDR removed or restricted in many Hampshire areas including:

• Winchester: Old Town, Chilcomb, Sparsholt, Twyford
• Southampton: Bassett Green Village, Portswood
• Romsey: Town center conservation area
• Bishops Waltham: Historic core
• Alresford: Conservation area

Listed Buildings

• PDR completely removed for listed buildings
• Listed building consent required for all changes
• Many period properties in Winchester and Romsey affected

Article 4 Directions

• Some Hampshire streets have Article 4 removing PDR
• Usually historic streets or special character areas
• Check with council if unsure

Designated Areas

• Areas of Outstanding Natural Beauty (AONB): South Downs, North Wessex Downs
• National Parks: Parts of Hampshire border South Downs National Park
• Stricter PDR limits apply

How to Check Your Permitted Development Rights

1. Measure from original rear wall: Not from previous extensions
2. Check planning history: Previous extensions reduce allowances
3. Calculate coverage: Add up all buildings and extensions
4. Check conservation area: Use council's online map
5. Verify property age: Pre-1948 = use 1948 as "original"
6. Assess neighbour impact: Would they object to Prior Approval?

During a complimentary consultation, we can discuss whether permitted development may apply based on the project information available. This is a professional opinion, not a lawful development certificate or authority determination.

Permitted Development vs Planning Permission: Which is Better?

Permitted Development Advantages

• Faster: 6 weeks (Prior Approval) vs 8-12 weeks (planning)
• Cheaper: the current published fee vs the current published fee council fee
• Less restrictive: No design judgment, just size limits
• Higher likelihood of approval: If within limits, usually approved

Planning Permission Advantages

• Larger extensions: No 6m/8m depth limit
• Design freedom: Modern materials, contemporary styles allowed
• Neighbour disputes: Council mediates and decides
• Property value: Larger extensions add more value

Common Hampshire Extension Scenarios

Scenario 1: Winchester Terraced House - 6m Kitchen Extension

• House type: Semi-detached
• Extension depth: 6m
• PDR eligible? Yes, with Prior Approval (neighbors notified)
• Timeline: 6 weeks Prior Approval
• Cost: the current published fee council fee + the current published fee design

Scenario 2: Basingstoke Detached - 8m Rear Extension

• House type: Detached
• Extension depth: 8m
• PDR eligible? Yes, with Prior Approval
• Timeline: 6 weeks Prior Approval
• Neighbor risk: Higher with 8m depth, consider planning

Scenario 3: Southampton Victorian - Side Return

• House type: Terraced Victorian
• Extension type: 2m wide side return
• PDR eligible? Often NO (within 2m boundary, over 2.5m high)
• Solution: Apply for planning permission
• Timeline: 8-12 weeks planning

Scenario 4: Winchester Conservation Area

• Location: Winchester Old Town conservation area
• Extension: Any rear extension
• PDR eligible? NO (PDR removed in conservation areas)
• Solution: Full planning application required

Building Regulations Still Required!

Critical point: Permitted Development Rights only cover planning permission. You still need Building Regulations approval for all extensions, covering:

• Structural safety
• Fire protection
• Insulation and energy efficiency
• Drainage and ventilation

Cost: the current published fee council Building Control fee

Permitted Development Application Process

If NO Prior Approval Needed (Under 3m/4m)

1. Confirm PDR eligibility
2. Proceed with design and building regs
3. Start construction (no planning needed)
4. Design and drawing schedule is agreed after instruction; statutory decision times vary by authority and route

If Prior Approval Needed (3m-6m or 4m-8m)

1. Submit Prior Approval application (£100 + VAT fee)
2. Council notifies neighbours (21 days)
3. Council decision (42 days total)
4. Proceed with building regs
5. Start construction
6. Design and drawing schedule is agreed after instruction; statutory decision times vary by authority and route

When Neighbors Object to Prior Approval

Council assesses impact on neighbouring amenity considering:

• Loss of light to habitable rooms
• Overbearing impact (too close/too high)
• Loss of privacy/overlooking

If council refuses Prior Approval: You can submit full planning permission application instead.

Permitted Development Rights in Hampshire: Our Advice

When to Use PDR

• Extension within limits (6m terraced, 8m detached)
• Good relationship with neighbours
• Straightforward design matching existing house
• Want to save time and fees

When to Go Straight to Planning

• Want larger extension (over 6m/8m depth)
• Conservation area or listed building
• Modern design with different materials
• Anticipated neighbour objections
• Want certainty before investing in designs

Hampshire Build's Permitted Development Service

We help Winchester, Basingstoke, and Southampton homeowners navigate PDR:

• Initial route discussion: Talk through whether permitted development may apply; final confirmation depends on the relevant rules and authority
• Prior Approval: Separately scoped where required; statutory application fees are paid separately
• Neighbour consultation: Explain the applicable process and submission requirements
• Building Regulations: Building regulation drawings are prepared for Building Notice submission; submission is included only where stated in the selected package
• Defined package scope: Pre-Build Package £1,950 + VAT includes measured survey, planning drawings and submission, Building Notice drawings and required structural calculations by an independent qualified structural engineer

Key Permitted Development Pitfalls to Avoid

• Starting work before Prior Approval: Enforcement action risk
• Exceeding limits: Even 100mm over requires planning
• Ignoring building regs: Separate approval always needed
• Assuming PDR applies: Check conservation area status first
• Poor neighbour relations: Can scupper Prior Approval

Permitted Development Timeline Comparison Hampshire

• PDR (no Prior Approval): Start immediately
• PDR (with Prior Approval): 6 weeks
• Planning Permission: 8-12 weeks
• Conservation Area Planning: 12-16 weeks

We can discuss your project and permitted development questions during a complimentary consultation. Our fixed-fee packages from £1,950 + VAT cover the design documents and submissions set out for each package; additional routes and statutory fees are scoped separately.

Useful Links

• Extension cost calculator — get an instant estimate for your project
• House extensions Basingstoke — local planning guidance for Basingstoke homeowners
• House extensions Winchester — Winchester City Council permitted development rules
• Garage conversions Winchester — most garage conversions are Permitted Development
• Full cost guide for Hampshire extensions — complete budget breakdown

Property-specific checks before relying on permitted development

Permitted development rules differ between types of work, and an existing house may have constraints that are not obvious from its appearance. Before settling on a route, gather the planning history and any earlier permissions, record previous extensions and outbuildings, and check whether a condition or Article 4 direction restricts rights. Confirm whether heritage or other designations affect the property and which local planning authority is responsible for the address.

For an extension, compare the proposal with the original house and the relevant limits for its specific permitted development class; do not measure from a later addition or assume that the same test applies to a loft, outbuilding or side extension. Where uncertainty remains, ask the authority about the appropriate route, such as a planning application, prior approval or a Lawful Development Certificate. A certificate records the authority's decision on lawfulness; an informal opinion is not a substitute.

Permitted development relates to planning only. Building Regulations, structural design and any party wall process are separate matters to check for the proposed work.

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