Greenwich
Single storey rear infill extension
Single storey extension
Development Type
Roof extension/ loft conversion
Conversion into flats
Roof terrace/ balcony
Appeals
Borough
Greenwich
89 Griffin Road, SE18 7QU
Before
After
Roof extension/ loft conversion, Conversion into flats, Roof terrace/ balcony
The construction of rear dormer roof extensions to the main rear roof slope and rear outrigger and insertion of 3 rooflights into the front roof slope, conversion of property into 3 self-contained flats, bin and cycle storage, rear roof terrace, and all associated works.
4D Planning were instructed to help the client maximise the development potential of this mid terraced 3 storey property. We initially prepared a detailed feasibility assessment, which identified clear scope for a loft conversion, rear roof extension, extension above the outrigger, and a roof terrace above the ground floor extension. Following this advice, we submitted a planning application to Greenwich Council, which was approved.
Building on this success, we then advised the client on the potential to convert the property into 2 self contained flats. A full planning application was prepared and approved by the council. After reviewing the site constraints, planning history, and relevant policy framework, we advised that there was a reasonable planning basis to pursue a 3 flat conversion. A further application was submitted, supported by carefully designed drawings demonstrating compliance with minimum space standards and relevant planning policy and guidance.
Although the council refused the application, we advised the client that the reasons for refusal were not well founded. We therefore recommended an appeal. 4D Planning prepared and submitted the appeal, addressing each refusal reason in detail. The appeal was allowed, and planning permission was granted for the conversion of the property into 3 self contained flats, together with the previously approved roof extensions and roof terrace.
This Greenwich case study demonstrates why early and strategic planning advice is essential when seeking to maximise the development potential of a residential property. 4D Planning were instructed to advise on how a mid terraced 3 storey dwelling could be carefully intensified over time, rather than pursued through a single high risk application.
From the outset, our role was not simply to prepare drawings, but to assess the site constraints, permitted development fallback, planning history and local policy context. This allowed us to identify a realistic route to achieving a substantially enhanced final outcome for the client through a phased and managed approach.
Our involvement began with a detailed feasibility assessment. This confirmed that the property could accommodate rear dormer roof extensions, rooflights and extensions to the rear outrigger, while maintaining an acceptable relationship with neighbouring properties and the wider terrace.
Rather than immediately pursuing a full flat conversion, we advised securing lawful development for roof alterations first. This created a strong fallback position and significantly reduced planning risk at later stages.
A Certificate of Lawful Development was obtained for the initial roof works. This established the principle of roof alteration and allowed subsequent applications to focus on refinement and residential use, rather than debating basic acceptability.
This step was critical in Greenwich, where roof extensions and intensification are closely scrutinised. By locking in lawful works early, the client was placed in a far stronger position moving forward.
Following the lawful development approval, 4D Planning prepared and submitted a full planning application to Greenwich Council under reference 24/2073/F. The proposal included:
The application was supported by a robust planning statement demonstrating compliance with the London Plan, the Greenwich Local Plan and national policy.
All proposed flats were designed to meet or exceed minimum internal space standards. Particular care was taken with ceiling heights, natural light, storage provision and circulation, which are common failure points in roof level conversions.
The roof additions were designed to remain visually subordinate, protecting the rhythm of the terrace and limiting visual impact from public viewpoints.
This scheme was not delivered through a single submission. It required patience, careful sequencing and ongoing liaison with the council. At later stages, when the council raised objections to the intensity of the development, 4D Planning advised that the refusal reasons were not well founded when assessed against policy.
We prepared and submitted a detailed planning appeal, addressing each refusal reason and reinforcing the policy compliant nature of the scheme. The appeal was allowed, and planning permission was granted for the conversion into 3 self contained flats together with the previously approved roof extensions and roof terrace.
This outcome highlights the value of experience and strategic judgment when navigating complex planning decisions.
This project clearly demonstrates that maximising value often requires a long term planning strategy rather than a single application approach. By applying for different elements in stages, risk was reduced and the final outcome was significantly improved.
Success was achieved by aligning the proposals with London Plan housing policies, internal space standards, and local design guidance, rather than attempting to force an over intensive scheme.
Not all refusals are the end of the road. Understanding when to appeal, how to structure an appeal case, and how inspectors assess policy compliance can make a decisive difference.
This Greenwich case study shows that small scale roof extensions and residential conversions can deliver substantial gains where they are supported by early feasibility advice, a clear planning strategy, and experienced professional input.
If you are considering a rear dormer roof extension, flat conversion or residential intensification in Greenwich, 4D Planning can advise on the most effective route forward, from initial feasibility through staged applications to final approval. Contact us today for a consultation and free quote!
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