Lawful development certificate drawings for Hounslow, £539
Hounslow uses one checklist for proposed and existing certificates, and it has two traps: a location plan may not come from Land Registry, and a CIL form must go in with the application. We draw to the list.
- £389 drawings + £150 survey (£539 total)
- One checklist, both types
- CIL form handled
What does a lawful development certificate pack cost in Hounslow?
We charge £539: £389 for the drawings, forms and submission and £150 for the survey, with no VAT to add. Hounslow Council’s certificate fee is paid to the council.
What the Hounslow price covers
- A survey that fixes the existing house and any outbuilding
- Block plan at 1:500 and existing and proposed plans, elevations, sections and a roof plan where the roof changes
- A location plan from a source Hounslow accepts
- The CIL additional information form and the application forms, with submission to Hounslow
- A checklist of the evidence for works already built
What Hounslow’s certificate checklist asks for
Hounslow’s checklist covers proposed and existing certificates together. The national items are the application form, location plan, block plan, and existing and proposed elevations, floor plans and sections, with roof plans only if the roof alters. Its local items for validation are a CIL form, evidence and optional photographs (Hounslow checklist).
Drawings are at 1:50 or 1:100, the block plan at 1:500. For example, a proposed rear outbuilding would be drawn on a block plan showing its distance to each boundary, while a decade-old extension would add the evidence row.
Evidence, location plans and CIL in Hounslow
For an existing-use application the evidence row asks for copies of relevant bills, tenancy agreements, sworn affidavits and similar. The checklist adds that the location plan must not be sourced from Land Registry or from Hounslow itself, so it comes from a licensed mapping supplier.
The CIL form lets the council work out whether a charge applies from the floor areas you give. The Mayor’s levy is owed only where a scheme is liable at all.
Article 4, extension rules and timing
Hounslow’s Article 4(2) directions cover Bedford Park and Gunnersbury Park conservation areas, and its page also lists a borough-wide direction on houses becoming small HMOs (Hounslow Article 4). A proposed certificate cannot confirm what a direction has removed.
Where an extension stays within permitted development, the council’s Residential Extension Guidelines still set the depths it expects on a planning application (Hounslow guidelines). Hounslow decided 380 of 391 householder applications inside 8 weeks in the year to June 2026; certificates are separate and we cannot promise a date.
Hounslow certificate applications in numbers
- 1:500
- Scale Hounslow’s certificate checklist sets for the block plan. Hounslow: certificate of lawfulness checklist (proposed and existing)
- 1:50 or 1:100
- Scales Hounslow’s certificate checklist sets for elevations, floor plans, sections and roof plans. Hounslow: certificate of lawfulness checklist (proposed and existing)
- No Land Registry plans
- Hounslow’s checklist bars location plans sourced from Land Registry or the council. Hounslow: certificate of lawfulness checklist (proposed and existing)
- CIL form
- Local requirement that goes in with every certificate application so the council can test CIL liability. Hounslow: certificate of lawfulness checklist (proposed and existing)
- 2
- Conservation areas, Bedford Park and Gunnersbury Park, covered by Hounslow’s Article 4(2) directions. Hounslow: Article 4 directions
- 380 of 391
- Hounslow Council householder applications decided within 8 weeks in the year to June 2026, out of all it decided (prior approvals not counted). MHCLG live table PS2, planning application statistics by district, July 2025 to June 2026 (GOV.UK)
- £72.73 per m²
- The Mayor of London’s CIL in Hounslow (band 2) for permissions granted in 2026, owed only when a scheme is liable for CIL in the first place. Mayoral CIL: annual rate summary for 2026, Table 1 (Greater London Authority)
Hounslow certificate questions
Does Hounslow use the same list for proposed and existing certificates?
Yes. One checklist covers both, with evidence added for existing-use cases.
Can I use a Land Registry plan?
No. Hounslow’s checklist says the location plan must not be sourced from Land Registry or the council.
Do I need a CIL form for a small job?
Hounslow lists the form as a local requirement, so it goes in. Most householder schemes then owe nothing.
How fast does Hounslow decide?
It decided 380 of 391 householder cases within 8 weeks last year. We cannot promise a date for a certificate.
Other services people book with this one
- Rear extension drawings£439 drawings + £150 survey (£589 total)
- Loft conversion drawings£439 drawings + £150 survey (£589 total)
- Prior approval for a larger home extension£349 drawings + £150 survey (£499 total)
- Householder planning drawings£479 drawings + £150 survey (£629 total)
- Building regulations drawings£479 drawings + £150 survey (£629 total)
Price your Hounslow certificate
Send the address and what you plan or built. We say whether a certificate fits and quote a fixed fee.