Richmond throws up the same handful of problems again and again for homeowners planning an extension. This piece works through each one and how it actually gets resolved, drawing on the process used by architect Richmond teams typically follow on local projects.
Problem: You don't know if your street still has Permitted Development rights
Richmond has 85 conservation areas, the largest footprint of any London borough, and several streets carry Article 4 Directions on top. Neither is obvious from looking at a house.
Solution: A free desktop check against your specific address, done before any design work starts, confirms which rules actually apply. Under current Permitted Development rules, an attached house can typically extend up to 6 metres deep and a detached one up to 8 metres, but conservation status or an Article 4 Direction removes that allowance entirely, requiring a full application instead.
Problem: Being outside a conservation area doesn't guarantee an easy application
Homeowners often assume a clear planning history means a straightforward process. Richmond's planning department applies scrutiny across the whole borough, not just inside conservation boundaries.
Solution: Preparing a clear architectural narrative alongside accurate drawings, rather than relying on size compliance alone, tends to get better results. Richmond's planning approach is design-led and context-driven, so a proposal that addresses protected views, tree preservation and neighbouring amenity from the outset avoids the back-and-forth that comes from submitting drawings without that context built in.
Problem: The timeline feels open-ended
Nobody wants to commit to a project without knowing roughly how long it will take. Richmond Council targets 8 weeks for a standard householder decision, but conservation areas and complex schemes commonly stretch that.
Solution: Budgeting for 13 weeks in a conservation area, rather than hoping for the 8-week standard, sets realistic expectations from the start. Once granted, permission stays valid for 3 years, so there's no need to rush construction once approval lands. Extra time in conservation areas typically goes toward the design detail, not council delay.
Problem: Costs feel vague until you're already committed
General cost figures rarely match what a specific Richmond property will actually need, particularly on period homes with structural quirks.
Solution: A single-storey rear extension in Richmond typically runs £2,000 to £2,800 per square metre, with architect fees usually landing between 8% and 15% of build cost. A 20 square metre extension therefore runs roughly £45,000 to £60,000 including design fees, though conservation area requirements can add to that total through extra design time. A property-specific estimate, agreed before any design fee, protects against surprises later.
Problem: Georgian and Victorian architecture doesn't respond well to generic design
Richmond's architectural fabric spans Georgian terraces, Victorian villas and Arts and Crafts-influenced detached homes. A one-size design approach tends to clash with at least two of the three.
Solution: Proportion, material quality and rhythm need to be assessed against the specific property and street, not applied as a template. Richmond rewards designs that feel settled rather than bold, which means matching height, massing and materials to what's already there rather than pushing the boundaries of what's technically allowed.
Problem: Loft conversions raise questions extensions don't
Richmond's period roofscapes vary enough that a loft conversion approach suited to one street can look out of place on another.
Solution: Velux, dormer and hip-to-gable options each suit different roof shapes and planning contexts. For a closer look at how these decisions actually play out on a real project, this piece walks through survey to completion in practice, useful context whether your plans involve a full extension or a loft conversion alone.
Problem: Coordinating separate specialists slows everything down
When architectural design and structural engineering come from two different firms, drawings and calculations can drift out of sync, particularly once a conservation officer requests a change partway through.
Solution: An in-house structural engineer keeps calculations aligned with the design from day one. It's a detail most architecture firms don't offer, and it tends to reduce the delays that come from a beam calculation only being checked once drawings are already finished.
Problem: You're not sure what to actually check before choosing a firm
Not every architect has genuine Richmond-specific experience, even with a strong general portfolio.
Solution: RIBA Chartered status and ARB registration confirm design standards and legal registration respectively, but local track record matters just as much here. Asking how many completed projects sit specifically within Richmond's postcodes, and how many live applications a firm currently has with the council, gives a clearer picture than a portfolio alone.
Where this leaves most Richmond homeowners
Every problem above traces back to the same root cause: starting design work before confirming what's actually possible on a specific street. Richmond's scale of conservation coverage makes that check more important here than in most boroughs.
A free feasibility check, reviewing loft conversion in Richmond planning services conservation status and realistic costs together, replaces most of these problems with a clear answer before a single drawing is made.
