Fixed-fee planning, building regulations, loft, extension and mansard drawings for properties in Streatham (SW16). MCIAT chartered. 30% below typical London architect rates.
MCIAT chartered drawings for planning, building regs, lofts and extensions — fixed fees 30% below typical London architects. Tell us what you need and we’ll reply the same working day.
Streatham is Edwardian terraces, post-war flats. The streetscape is dominated by edwardian terraces, post-war flats, which means design decisions — roofscape, rear glazing, side returns, mansards — must respect the period rhythm of the row. Lambeth planning (Lambeth Council) decides applications here. Borough-wide Article 4 for HMO conversions; plus office-to-residential restrictions.
From £840. Planning permission drawings delivered by an MCIAT chartered team.
From £840. Building regulations drawings delivered by an MCIAT chartered team.
From £1,225. Loft conversion drawings delivered by an MCIAT chartered team.
From £1,225. House extension drawings delivered by an MCIAT chartered team.
From £1,575. Mansard roof extensions delivered by an MCIAT chartered team.
From £995. Garage conversion drawings delivered by an MCIAT chartered team.
From £1,950. Basement conversion drawings delivered by an MCIAT chartered team.
From £350. Structural calculations delivered by an MCIAT chartered team.
From £540. Measured building survey delivered by an MCIAT chartered team.
From £450. Party wall services delivered by an MCIAT chartered team.
From £1,225. Rear dormer drawings delivered by an MCIAT chartered team.
Streatham sits within Lambeth, so applications are decided by Lambeth Council. Most single-storey rear extensions and side-returns on terraced or semi-detached homes in Streatham fall under Permitted Development — up to 3m deep (attached) or 4m (detached), under 4m high. Flats, listed buildings and conservation areas always require full planning. Article 4 status here: Yes. We check eligibility free at the site visit.
Streatham is characterised by Edwardian terraces, post-war flats. The dominant stock is Edwardian terraces, post-war flats. We've drawn extensions and lofts for every period represented here — Victorian rear additions, Edwardian side returns, 1930s wrap-arounds, and contemporary infill where the streetscape allows.
Lambeth Council statutory determination is 8 weeks for householder applications. Validation typically adds 1–2 weeks. From your first call to a decision, expect 12–14 weeks total: 1 week measured survey, 2 weeks design, 1–2 weeks validation, 8 weeks determination. We've achieved a 98% first-time approval rate across Lambeth.
Loft conversion drawings in Streatham start at £1,225 for planning + building regs combined. Construction cost (separate from drawings) is £45,000–£75,000 for a standard rear dormer on a Victorian or Edwardian terrace, £65,000–£95,000 for a hip-to-gable plus dormer. We quote drawings as a fixed fee — no hourly creep.
Lambeth has 64 designated conservation areas. Nearest to Streatham: Clapham Common. In a conservation area, full planning is required for most external work (including roof additions, rendering, replacement windows). We prepare a Heritage Statement covering the conservation area's character appraisal.
Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.
Every Streatham postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. Streatham fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| SW16 | Streatham / Norbury | Edwardian terraces, post-war flats | SW16 straddles a boundary: Streatham / Norbury addresses fall to Lambeth Council or Wandsworth Council or Merton Council or Croydon Council, so confirm which authority validates the drawing package before submitting SW16 drawings. |
| SW4 | Clapham | Victorian terraces, Edwardian villas | Neighbouring Clapham, where drawing package work is handled by the same Lambeth Council case officers. |
| SW2 | Brixton | Victorian terraces, post-war estates | Neighbouring Brixton, where drawing package work is handled by the same Lambeth Council case officers. |
| SE24 | Herne Hill | Victorian villas, Edwardian terraces | Neighbouring Herne Hill, where drawing package work is handled by the same Lambeth Council case officers. |
| SE11 | Kennington | Georgian terraces, post-war estates | Neighbouring Kennington, where drawing package work is handled by the same Lambeth Council case officers. |
| SW9 | Stockwell | Victorian terraces, post-war estates | Neighbouring Stockwell, where drawing package work is handled by the same Lambeth Council case officers. |
| SE11 | Vauxhall | Regency terraces, modern apartments, post-war flats | Neighbouring Vauxhall, where drawing package work is handled by the same Lambeth Council case officers. |
| SE27 | West Norwood | Victorian terraces, Edwardian villas | Neighbouring West Norwood, where drawing package work is handled by the same Lambeth Council case officers. |
| SE27 | Tulse Hill | Victorian villas, Edwardian terraces | Neighbouring Tulse Hill, where drawing package work is handled by the same Lambeth Council case officers. |
| SE1 | Waterloo | Georgian terraces, post-war flats, new-build | Neighbouring Waterloo, where drawing package work is handled by the same Lambeth Council case officers. |
Roof pitch, wall build-up and plot depth change every few Streatham streets, and each one changes what a drawing package can achieve at that address.
Conservation areas covering Streatham: Lambeth Council runs 64, and Kennington, Brockwell Park, Streatham Hill are the ones Streatham owners meet most. A drawing package inside a Streatham conservation area loses permitted development, so the Streatham submission is a householder application at £258 decided in 8 weeks — not a £120 prior approval decided in 6 weeks. In Streatham Hill a drawing package is judged on the street elevation first.
Streatham and Article 4: Borough-wide Article 4 for HMO conversions; plus office-to-residential restrictions. A drawing package planned at a SW16 address is checked against that direction first; Lambeth Council publishes the Streatham extent, and the SW16 line rarely follows the Streatham boundary you would expect.
The building fabric around Streatham: Victorian terraces in Clapham, Brixton, Herne Hill; Edwardian villas; 1930s and post-war estates in parts of Streatham; Georgian in Kennington. Mix of dense Victorian residential and post-war estate; strong conservation area coverage; generally design-led planning decisions. A drawing package in Streatham is scoped against that stock first. Our Streatham fixed fee starts at £840; the £1,750 Complete package runs the Streatham scheme through Lambeth Council planning and building control in one go.
Sources for this Streatham drawing package 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.
Fixed fee. MCIAT chartered. 98% first-time approval rate.
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