PlanScope Blog – Page 248
Practical guides to UK planning applications: which reports your council expects, permitted development, constraints, costs and how to prepare each document.
Articles – page 248
9164 articlesDaylight assessment in a conservation area context
Historic street form and standard daylight targets pull against each other. Here is how to establish the existing baseline, derive a contextual alternative target, and present the trade-off to a case officer.
Air quality neutral and the emissions benchmarks
Air quality neutral is a source test, not an exposure test. Here is how building and transport emissions are calculated against benchmarks, and the measures that close a shortfall.
Wind effects of a rooftop plant enclosure
A plant enclosure added late raises the effective height of a building and feeds downwash to the pavement. Here is how comfort and safety criteria are applied, and why acoustic screening pulls against wind mitigation.
Replacement planting conditions after tree loss
A condition saying one replacement tree shall be planted achieves very little. Here is the specification, seasonal wording and establishment obligation that actually produce a surviving tree.
Highway objections at appeal and what inspectors accept
Refusal on transport grounds needs an unacceptable safety impact or a severe residual cumulative impact. Here is how each limb is evidenced at appeal, and which objections a condition can cure.
Checking the housing land supply position of an authority
A stated five year supply usually rests on two or three large sites. Here is where the figures are published, how to test the site list against the deliverability definition, and how the position changes a decision.
Hip to gable conversions and the effect on a pair
Hip to gable is permitted development under Class B on most houses, with a 40 or 50 cubic metre allowance that includes earlier roof work. On a matched semi-detached pair the design argument is the harder one.
Viability review mechanisms: early, mid and late stage
A review mechanism is the price of a permission granted on a viability case. Here is how each type is triggered, which inputs stay fixed, and why the cap matters more than the surplus share.
Combustible materials rules and planning elevations
Regulation 7(2) restricts combustible materials in the external walls and specified attachments of relevant buildings. Here is what that does to a planning material palette, and how to draft the condition.
Daylight and a single storey rear addition next door
Depth at the boundary against the distance to the neighbour's nearest window decides most daylight objections to a single storey rear extension. Here are the tests councils apply and the design changes that resolve them.
Sound insulation between a venue and the flat above
Music reaches the flat above through the structure at 63 Hz and 125 Hz, where weighted insulation figures say little. Here is how criteria are set, what box-in-box construction can achieve, and how limiter conditions are drafted.
Energy assessment for student accommodation schemes
Student accommodation concentrates hot water demand into two short peaks and puts high gains into small single aspect rooms. Here is how the classification, the distribution losses and the overheating assumptions decide the submission.
Tree and subsidence claims: the evidence a council needs
An insurer's letter is not evidence of causation. Councils deciding subsidence applications for protected trees want soil and foundation data, root identification and a full seasonal cycle of level monitoring.
Netting off an existing use in trip generation
An existing use credit only survives if the lawful use is still extant. Here is the evidence councils expect, how to match the survey periods on both sides of the subtraction, and where highway officers refuse a credit.
Finding conservation area appraisals and management plans
The conservation area appraisal is the council's own statement of what makes an area special. Here is where authorities publish it, and how to turn its character areas and positive contributor lists into application text.
Rooflights on a front roof slope in a conservation area
Class C of the GPDO 2015 has no blanket conservation area exclusion, so a flush front rooflight is often lawful where a dormer is not. The 150mm projection limit and Article 4 directions decide it.
Public rights of way affected by development
Planning permission does not authorise obstructing a footpath. The definitive map, section 257 orders, objection risk and how long the process really takes.
European sites, recreational pressure and greenspace
New homes within a zone of influence add recreational pressure to protected sites. How the zones work, what greenspace has to deliver and how it is secured.
Checking source protection zones and groundwater data
An inner source protection zone usually rules out infiltration drainage. Where to check, what the zones mean and what evidence the regulator expects.
Extending a semi where the neighbour has already extended
A grant next door is evidence, not entitlement. How consistency is treated, how amenity baselines shift, and how to frame the argument.
Fire service vehicle access: widths, turning and standing
Fire appliance access is fixed by the planning layout. The dimensions, the turning head rules, standing positions and the details that catch schemes late.
Daylight to a north facing habitable room
The 90 degree orientation rule removes the sunlight assessment for a north facing window. What still applies, and how to design around the result.
Cooling hierarchy: proving the case before mechanical cooling
Active cooling sits at the bottom of the hierarchy for a reason. What has to be modelled and evidenced at each earlier step before it becomes defensible.
Acoustic fences: when a barrier actually reduces noise
A garden acoustic fence works only where it breaks the line of sight to the source. Height, mass, gaps, road noise, plant screening and the height limit.
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