Fixed-fee planning, building regulations, loft, extension and mansard drawings for properties in Forest Hill (SE23). 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.
Forest Hill is Victorian villas, Edwardian terraces. The streetscape is dominated by victorian villas, edwardian terraces, which means design decisions — roofscape, rear glazing, side returns, mansards — must respect the period rhythm of the row. Lewisham planning (Lewisham Council) decides applications here. Most permitted development rights apply normally in Lewisham for residential extensions.
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.
Forest Hill sits within Lewisham, so applications are decided by Lewisham Council. Most single-storey rear extensions and side-returns on terraced or semi-detached homes in Forest Hill 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: No. We check eligibility free at the site visit.
Forest Hill is characterised by Victorian villas, Edwardian terraces. The dominant stock is Victorian villas, Edwardian terraces. 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.
Lewisham 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 Lewisham.
Loft conversion drawings in Forest Hill 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.
Lewisham has 30 designated conservation areas. Nearest to Forest Hill: Blackheath. 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 Forest Hill postcode district we draw in, the stock that dominates it and the authority that validates a drawing package there. Forest Hill fees below are the statutory England rates for 2026, not drawing package estimates.
| Postcode | Area | Dominant stock | What it means for a drawing package |
|---|---|---|---|
| SE23 | Forest Hill / Honor Oak | Victorian villas, Edwardian terraces | A drawing package at an SE23 address in Forest Hill / Honor Oak is determined by Lewisham Council under its own Local Plan policies for Forest Hill / Honor Oak. |
| SE4 | Brockley | Victorian and Edwardian terraces | Neighbouring Brockley, where drawing package work is handled by the same Lewisham Council case officers. |
| SE23 | Honor Oak | Victorian villas, Edwardian terraces | Neighbouring Honor Oak, where drawing package work is handled by the same Lewisham Council case officers. |
| SE13 | Lewisham | Victorian terraces, post-war flats | Neighbouring Lewisham, where drawing package work is handled by the same Lewisham Council case officers. |
| SE3 | Blackheath | Georgian villas, Victorian terraces | Neighbouring Blackheath, where drawing package work is handled by the same Lewisham Council case officers. |
| SE6 | Catford | 1930s semi-detached, post-war flats | Neighbouring Catford, where drawing package work is handled by the same Lewisham Council case officers. |
| SE8 | Deptford | Georgian terraces, post-war estates, new-build | Neighbouring Deptford, where drawing package work is handled by the same Lewisham Council case officers. |
| SE13 | Hither Green | Edwardian terraces, 1930s semi-detached | Neighbouring Hither Green, where drawing package work is handled by the same Lewisham Council case officers. |
| SE26 | Sydenham | Victorian villas, Edwardian terraces | Neighbouring Sydenham, where drawing package work is handled by the same Lewisham Council case officers. |
Roof pitch, wall build-up and plot depth change every few Forest Hill streets, and each one changes what a drawing package can achieve at that address.
Conservation areas covering Forest Hill: Lewisham Council runs 30, and Deptford High Street, Forest Hill, Hither Green are the ones Forest Hill owners meet most. A drawing package inside a Forest Hill conservation area loses permitted development, so the Forest Hill submission is a householder application at £258 decided in 8 weeks — not a £120 prior approval decided in 6 weeks. In Hither Green a drawing package is judged on the street elevation first.
Article 4 and your Forest Hill drawing package: Lewisham Council has made no borough-wide direction, so permitted development for a drawing package in Forest Hill generally survives outside Forest Hill conservation areas and listed curtilages. A Lawful Development Certificate at £129 is how a SE23 owner records that a drawing package was lawful.
What Forest Hill is built from: Victorian and Edwardian terraces across Brockley, Honor Oak, Forest Hill; 1930s semi-detached in Catford and Hither Green; post-war mixed in Deptford. Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD. That mix decides the drawing package route in Forest Hill more than the postcode does. Our fixed fee for architectural drawings in Forest Hill starts at £840, against £1,750 for the Complete package that carries a Forest Hill scheme through Lewisham Council planning and building regulations together.
Sources for this Forest Hill 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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