Lawful Development Certificate in Hounslow from £575
Chiswick, Isleworth, Brentford and Hounslow: a proposed certificate can use the council’s fast track, and two conservation areas have lost rights.
£575 £425 drawings + £150 survey (£575 total), no VAT to add
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The short answer
Hounslow’s fast track planning service accepts a proposed certificate of lawfulness for householder work that meets permitted development, such as a single-storey rear or side extension, a roof extension or an outbuilding. It confirms whether the application is valid within 2 working days and targets a decision in 2 to 3 weeks, against 8 to 13 on the standard route, for an additional service fee of £600. Our fee is £425 drawings + £150 survey (£575 total), no VAT to add; the council’s fees are separate.
Permitted development drawings and Lawful Development Certificate
from £575
- Drawings
- £425
- Measured survey
- £150
- Total you pay
- £575
- VAT
- None to add
- A measured survey of the house, so the drawings show your property and not a template
- Existing and proposed plans and elevations drawn to show each permitted development limit being met
- A check of your address for Bedford Park, Gunnersbury Park, other conservation areas and the small-HMO direction
- Help deciding if the fast track is worth its extra fee for your timetable
- The application submitted for you, with answers to the officer
£425 drawings + £150 survey (£575 total). A starting fee: we confirm one fixed figure after checking your address. The council’s own fee, where there is one, is paid to the council.
Get my fixed feeHow a Hounslow certificate runs
Rights check
We check the Article 4 list and conservation areas for your address.
Survey
We measure depths, heights and distances to the boundaries.
Drawings to the rules
Each sheet states the limit it tests.
Apply
We submit, through the fast track request first if you choose it.
The fast track, and what it asks of you
Hounslow lists a proposed certificate for a householder development as eligible, along with larger home extension prior approvals and householder applications that fit its design SPD. You send a fast track request form, receive acceptance and a service agreement within 3 working days, then apply on the Planning Portal with your fast track reference in the description.
The council guides the extra charge at £600, with priority validation, validity confirmed within 2 working days and a dedicated officer. Hounslow adopted its CIL charging schedule on 24 July 2015 and indexes it each year, on 100 square metres or more of new floor space, so a typical certificate project is outside it. For example, an Isleworth owner with a loft builder booked can pay for the quicker answer, while someone with no deadline can take the standard 8 to 13 weeks.
Article 4 directions and conservation areas
Hounslow has Article 4(2) directions for Bedford Park and Gunnersbury Park conservation areas, confirmed on 24 July 2001, and a borough-wide direction on small HMOs in force since 4 September 2023. A certificate cannot be granted for work whose permitted development right has been removed.
We check your address first, and move you to a householder application when that is what the house needs.
Rear extension drawings in Hounslow · Loft conversion drawings in Hounslow
Certificates in Hounslow in numbers
380 of 391
Householder decisions by Hounslow Council between July 2025 and June 2026 (prior approvals left out) that were made inside 8 weeks.
Source: MHCLG live table PS2, district planning application statistics, July 2025 to June 2026 (GOV.UK)
2 to 3 weeks
Target decision time of Hounslow’s fast track lawful development certificate service.
8 to 13 weeks
Target decision time on the standard route.
£600
Additional service fee Hounslow guides for the fast track.
2 days
Working days within which the council confirms whether a fast track application is valid.
3 days
Working days within which the council confirms acceptance and a service agreement after the request.
24 Jul 2001
Date the Bedford Park and Gunnersbury Park Article 4(2) directions were confirmed.
Source: Article 4(2) directions for Bedford Park and Gunnersbury Park conservation areas (Hounslow Council)
4 Sep 2023
Date Hounslow’s borough-wide Article 4 direction on small HMOs came into force.
Questions about certificates in Hounslow
Is the fast track worth £600?
Only if time matters. It cuts the target from 8 to 13 weeks to 2 to 3, and the decision is on the same permitted development test.
What can use it?
Proposed certificates for householder work that meets permitted development, such as rear or side extensions, roof extensions and outbuildings.
Can I get a certificate in Bedford Park?
Not for work whose right the Article 4(2) direction removed. We read the direction against your plan first.
Do I still need building regulations?
Yes. A certificate covers planning law only.
Put it in writing before you build in Hounslow
Send the address and what you plan. We reply with whether it fits permitted development and a fixed fee, from £425 drawings + £150 survey (£575 total).