Mark Eden
10 min read
Key Takeaway
Complete guide to permitted development rights for Hampshire home extensions. Extend without planning permission - save £528 in fees and 8-12 weeks. Understand limits, restrictions, and Prior Approval process for Winchester, Basingstoke, and Southampton homes.
Extending Without Planning Permission in Hampshire 2025
Many Hampshire homeowners don't realise they can extend under Permitted Development Rights (PDR) without needing full planning permission. This can save you £528 in planning fees (as of April 2025) and 8-12 weeks of waiting time on your Winchester, Basingstoke, or Southampton extension project. Here's your complete guide:
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 2025
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: £240 council fee (vs £528 for planning, as of April 2025)
- 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
- Measure from original rear wall: Not from previous extensions
- Check planning history: Previous extensions reduce allowances
- Calculate coverage: Add up all buildings and extensions
- Check conservation area: Use council's online map
- Verify property age: Pre-1948 = use 1948 as "original"
- Assess neighbour impact: Would they object to Prior Approval?
Hampshire Build offers free PDR assessment during feasibility consultations - we check your exact eligibility.
Permitted Development vs Planning Permission: Which is Better?
Permitted Development Advantages
- Faster: 6 weeks (Prior Approval) vs 8-12 weeks (planning)
- Cheaper: £240 vs £528 council fee
- Less restrictive: No design judgment, just size limits
- Higher success rate: 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: £240 council fee + £1,350-£1,950 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: £500-£800 council Building Control fee
Permitted Development Application Process
If NO Prior Approval Needed (Under 3m/4m)
- Confirm PDR eligibility
- Proceed with design and building regs
- Start construction (no planning needed)
- Total timeline: 6-8 weeks design + building regs
If Prior Approval Needed (3m-6m or 4m-8m)
- Submit Prior Approval application (£100 fee)
- Council notifies neighbours (21 days)
- Council decision (42 days total)
- Proceed with building regs
- Start construction
- Total timeline: 6 weeks Prior Approval + 6 weeks building regs
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:
- Free PDR assessment: Check your exact eligibility
- Prior Approval applications: Prepare and submit for £100 fee
- Neighbour strategy: Advise on engagement to avoid objections
- Building Regulations: Handle separate building regs application
- Complete package: Essential £1,350 or Pre-Build £1,950+VAT
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 assess your Permitted Development Rights as part of our free feasibility consultation. Our fixed-fee packages from £1,350+VAT handle Prior Approval applications, building regulations, and complete architectural drawings for your Hampshire extension.
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
