Loft Conversions in Mortlake

Mortlake FAQ for loft conversion drawings

Do I need planning permission for loft conversion drawings in Mortlake?

Most loft conversion drawings projects in Mortlake fall under Permitted Development if the property is a house (not a flat), not listed, and not in a conservation area. Richmond upon Thames has no borough-wide Article 4 Direction. We confirm eligibility free at the site survey.

How much does loft conversion drawings cost in Mortlake?

Drawings: fixed fee from £1,225 (Loft Conversions). Construction cost is separate and depends on size, finish and structural complexity. For victorian and edwardian terraces (typical of Mortlake), expect £45,000–£85,000 build cost for a standard rear extension or loft, more for mansards or basements.

How long does the loft conversion drawings process take in Mortlake?

12–14 weeks from first call to Richmond Council planning decision. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination.

What property types are common in Mortlake?

Mortlake is characterised by victorian and edwardian terraces. We've delivered loft conversion drawings for every period represented here — the design choices vary significantly by stock.

Will my application succeed in Mortlake?

Our first-time approval rate in Richmond upon Thames is 98%. Pre-application advice from Richmond Council is built into our process when the case is borderline (conservation area, Article 4, listed).

Where in Mortlake does a loft conversion actually get determined?

Every Mortlake postcode district we draw in, the stock that dominates it and the authority that validates a loft conversion there. Mortlake fees below are the statutory England rates for 2026, not loft conversion estimates.

Postcode	Area	Dominant stock	What it means for a loft conversion
SW14	Mortlake / East Sheen	Victorian and Edwardian terraces	Mortlake / East Sheen sits wholly inside SW14, so Richmond Council validates every loft conversion submitted from an SW14 address.
TW9	Richmond	Georgian terraces, Victorian villas	Neighbouring Richmond, where loft conversion work is handled by the same Richmond Council case officers.
TW1	Twickenham	Georgian fragments, Victorian terraces, Edwardian villas	Neighbouring Twickenham, where loft conversion work is handled by the same Richmond Council case officers.
TW9	Kew	Georgian and Edwardian villas	Neighbouring Kew, where loft conversion work is handled by the same Richmond Council case officers.
SW13	Barnes	Georgian villas, Edwardian terraces	Neighbouring Barnes, where loft conversion work is handled by the same Richmond Council case officers.
SW14	East Sheen	Edwardian villas, 1930s semi-detached	Neighbouring East Sheen, where loft conversion work is handled by the same Richmond Council case officers.
TW11	Teddington	Edwardian villas, Victorian terraces	Neighbouring Teddington, where loft conversion work is handled by the same Richmond Council case officers.
TW12	Hampton	Georgian villas, Edwardian terraces, 1930s semi-detached	Neighbouring Hampton, where loft conversion work is handled by the same Richmond Council case officers.
TW2	Whitton	1930s semi-detached	Neighbouring Whitton, where loft conversion work is handled by the same Richmond Council case officers.
TW10	Ham	Georgian villas, post-war estates	Neighbouring Ham, where loft conversion work is handled by the same Richmond Council case officers.

How does a loft conversion differ street by street across Mortlake?

Roof pitch, wall build-up and plot depth change every few Mortlake streets, and each one changes what a loft conversion can achieve at that address.

Mortlake (SW14) — loft conversion work in Mortlake means victorian and edwardian terraces. Mortlake is Victorian and Edwardian terraces. The Victorian butterfly and double-pitched roofs on these streets normally clear the 2.2 throughout SW14. Richmond Council decides the Mortlake application, and Mortlake station anchors the Mortlake location plan.
Near Mortlake: Ham (TW10) — Georgian common, post-war estate defines Ham, where georgian villas, post-war estates set what a loft conversion can do. Georgian roofs here are shallow and often behind a parapet across TW10. Any Ham loft conversion is validated by Richmond Council, with Ham Common the usual Ham reference point on the site plan.
Near Mortlake: Richmond (TW9, TW10) — loft conversion work in Richmond means georgian terraces, victorian villas. Richmond is Georgian centre, riverside conservation. Georgian roofs here are shallow and often behind a parapet throughout TW9. Richmond Council decides the Richmond application, and Richmond Green anchors the Richmond location plan.
Near Mortlake: Twickenham (TW1, TW2) — Georgian and Victorian riverside town defines Twickenham, where georgian fragments, victorian terraces, edwardian villas set what a loft conversion can do. Georgian roofs here are shallow and often behind a parapet across TW1. Any Twickenham loft conversion is validated by Richmond Council, with Twickenham Stadium the usual Twickenham reference point on the site plan.
Near Mortlake: Kew (TW9) — a loft conversion in Kew starts from georgian and edwardian villas, and Kew reads as Georgian and Edwardian villas around the green. Georgian roofs here are shallow and often behind a parapet in TW9. Richmond Council assesses Kew loft conversions against its own Kew character guidance, and the location plan we draw for Kew references Kew Gardens.
Near Mortlake: Barnes (SW13) — a loft conversion in Barnes starts from georgian villas, edwardian terraces, and Barnes reads as Georgian and Edwardian village. Georgian roofs here are shallow and often behind a parapet in SW13. Richmond Council assesses Barnes loft conversions against its own Barnes character guidance, and the location plan we draw for Barnes references Barnes Common.
Near Mortlake: East Sheen (SW14) — Edwardian villas, 1930s semi-detached defines East Sheen, where edwardian villas, 1930s semi-detached set what a loft conversion can do. Edwardian roofs run deeper front-to-back across SW14. Any East Sheen loft conversion is validated by Richmond Council, with Sheen Lane the usual East Sheen reference point on the site plan.

Does Mortlake planning policy restrict a loft conversion?

Mortlake conservation designations: there are 72 across Richmond Council, Kew Green, Hampton Wick, Twickenham Riverside among them. Designation costs a Mortlake owner the permitted-development route: a loft conversion then needs a £258 householder application over 8 weeks, in place of the £120 prior approval route that takes 6 weeks. Ham Common is the Mortlake designation that most often changes a loft conversion design.

No blanket Article 4 over Mortlake: Richmond Council has not withdrawn permitted development across Mortlake, so a loft conversion outside a Mortlake conservation area usually keeps it. The £129 Lawful Development Certificate is still the document a SW14 owner wants on file.

Mortlake housing stock: Georgian in Richmond Green and Twickenham; Edwardian villas in Barnes and East Sheen; 1930s semi-detached in Whitton; riverside cottages along the Thames. Highest conservation area coverage in London; Royal Parks and Thames corridor add heritage layers; design quality heavily scrutinised. Read that before choosing a loft conversion route in Mortlake — construction, not postcode, sets what is achievable. Loft conversions in Mortlake start at £1,225 on a fixed fee, or £1,750 for the Complete package covering both Richmond Council submissions.

What happens if a Mortlake property sits on a boundary?

Hounslow — cross the Mortlake boundary and Hounslow Council takes the loft conversion instead, applying 30 conservation areas of its own around W3. We re-price loft conversions at the Mortlake edge because Hounslow policy and Richmond upon Thames policy rarely align on loft conversion depth.
Kingston upon Thames — cross the Mortlake boundary and Kingston Council takes the loft conversion instead, applying 22 conservation areas of its own around KT1. We re-price loft conversions at the Mortlake edge because Kingston upon Thames policy and Richmond upon Thames policy rarely align on loft conversion depth.
Wandsworth — cross the Mortlake boundary and Wandsworth Council takes the loft conversion instead, applying 45 conservation areas of its own around SW8. We re-price loft conversions at the Mortlake edge because Wandsworth policy and Richmond upon Thames policy rarely align on loft conversion depth.
Hammersmith and Fulham — cross the Mortlake boundary and Hammersmith & Fulham Council takes the loft conversion instead, applying 45 conservation areas of its own around W6. We re-price loft conversions at the Mortlake edge because Hammersmith and Fulham policy and Richmond upon Thames policy rarely align on loft conversion depth.

Sources for this Mortlake loft conversion page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.