Buckinghamshire, Buckinghamshire
Architectural drawings in Buckinghamshire
Buckinghamshire has no single planning guide for home extensions. The council still uses the guidance of the four districts it replaced, so the rules depend on which part of the county your house is in. Our architectural drawings in Buckinghamshire start from £745 including VAT, and we identify the right guide before we draw. We are MCIAT chartered architectural technologists.
Fixed quote after a free constraints check
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Buckinghamshire in numbers
| Measure | Value | Period | Source |
|---|---|---|---|
| Conservation areas | 186 named conservation areas published by the council | — | planning.data.gov.uk |
| Article 4 direction areas | 389 Article 4 direction area polygons published by the council | — | planning.data.gov.uk |
| Tree preservation zones | 8,418 tree preservation zone polygons published by the council | — | planning.data.gov.uk |
| Listed building entries | 5,883 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| Green Belt share of the council area | 32 % of council area covered by green-belt polygons | — | planning.data.gov.uk |
| Householder decisions | 2,855 decisions | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications granted | 86.3 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications decided in time | 72.3 % decided within 8 weeks or an agreed extended period | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Larger home extension prior approvals refused | 48 decisions | 2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026) | assets.publishing.service.gov.uk |
| Lawful development certificate applications (PS1) | 943 certificates | 2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026) | assets.publishing.service.gov.uk |
| Average price, detached | 858,673 GBP | 2026-07 | publicdata.landregistry.gov.uk |
| Local plan | Legacy district plans (no Buckinghamshire-wide plan adopted yet) | — | buckinghamshire.gov.uk |
| Supplementary planning document | Householder Planning and Design Guidance SPD (former Wycombe area) | 2020 | buckinghamshire.gov.uk |
| Borough CIL charging schedule | Wycombe CIL Charging Schedule (West area) and Chiltern and South Bucks CIL Charging Schedule (East and South areas) | from 2012 (Wycombe, adopted Nov 2012); 2020 (Chiltern and South Bucks, adopted Jan 2020) | buckinghamshire.gov.uk |
A blank value means the figure has not been published, not that there are none. Check your own address with the council.
Constraints check: Buckinghamshire
What we check first on any Buckinghamshire address. Counts are for the whole council area.
- A · Conservation areas
- 186 named conservation areas published by the council
- C · Listed building entries
- 5,883 list entries (Historic England, within the LPA boundary)
Four guides for one county: which applies to you
The development plan is still a patchwork, summarised as Legacy district plans (no Buckinghamshire-wide plan adopted yet). Decisions on a home extension therefore turn on guidance inherited from the old districts, and the map line decides which one counts.
For a Wycombe address the guide is the Householder Planning and Design Guidance SPD (former Wycombe area). Chiltern addresses use the Residential Extensions and Householder Development SPD (former Chiltern area), and South Bucks ones the House Extensions Design Guide (former South Bucks area).
Around Aylesbury the reference is the Vale of Aylesbury Design SPD (former Aylesbury Vale area). We confirm your site against the right document at the first call, because a rear-extension depth that suits one guide can fall short of another.

Applications by the thousand in Buckinghamshire
This is a large authority. Between July last year and June this year it decided 4,532 applications of all types, including 2,855 householder cases, and granted 86.3 per cent of the householder ones.
Speed is the weak point. Only 72.3 per cent of householder decisions came within eight weeks or an agreed extension, so we advise building a generous lead time into your plans.
That is a countywide average, offered as a planning aid and not as a prediction.
Prior approval and certificates across Buckinghamshire
In the latest published year the council granted 18 larger home extensions by prior approval and refused 48. Refusals clearly outnumbered grants.
It also decided 5 upward extensions by prior approval and refused 4. Owners applied for 943 lawful development certificates.
Our Lawful Development Certificate drawings in Buckinghamshire show your work is permitted development, in writing.
Conservation, Article 4 and trees in Buckinghamshire
The council publishes 186 conservation areas and 389 Article 4 direction areas, which remove permitted development rights in particular places. It also publishes 8,418 tree preservation zones.
With numbers like these, the constraints check is not a formality here. We run it first, free, on your exact address, and we report what restricts the work before any design fee is taken.
Listed buildings and the Green Belt in Buckinghamshire
Historic England records 5,883 list entries: 132 at Grade I, 297 at Grade II* and 5,439 at Grade II. There are 147 scheduled monuments and 41 registered parks and gardens.
28 entries appear on the Heritage at Risk Register. About 32 per cent of the county is Green Belt, so extensions there must stay in proportion to the original house.
Working with a county this size
A county of this size spans market towns, villages, commuter suburbs and open countryside, and a single set of drawings cannot assume the same answer everywhere. We therefore start each Buckinghamshire job by placing the address: which former district, which guide, which levy zone, and which constraints.
You get that summary in writing, free, before you decide to go ahead. It names the route we expect, whether permitted development, prior approval or a householder application, and the points a case officer is likely to raise.
We then draw to a fixed fee and arrange an independent check of the set. Redrawing after council comments is free until approval.
Housing, prices and the levy in Buckinghamshire
82.3 per cent of the 220,328 households live in a house or bungalow, and 70 per cent own their home. A detached house averages £858,673, a semi-detached £472,407.
The levy follows the old districts too: the Wycombe CIL Charging Schedule (West area) and Chiltern and South Bucks CIL Charging Schedule (East and South areas). The former Aylesbury Vale area has no levy at present. Elsewhere rates vary by zone, so we identify the zone for your address and state any likely charge in the hand-over pack.
Architectural drawings for Buckinghamshire homes
The usual starting points are planning drawings in Buckinghamshire and rear extension drawings. Others include garden room drawings and garage conversion plans.
Bordering areas are covered on our pages for Slough, Three Rivers and Hillingdon.
What you receive


Services in Buckinghamshire
Questions
Which design guide does Buckinghamshire use for extensions?
It depends on the part of the county. The council still uses guidance from four former districts, including the Householder Planning and Design Guidance SPD (former Wycombe area). We confirm which one applies to your address.
How much are architectural drawings in Buckinghamshire?
Householder planning drawings start at £745 including VAT, fixed up front. The council's own fee is paid separately.
How long does Buckinghamshire take to decide a householder application?
In the latest figures 72.3 per cent were decided within eight weeks or an agreed extension. Allow extra time in your programme.
Is my Buckinghamshire house in a conservation area?
We check for free as a first step. The council publishes 186 conservation areas, and the answer affects which permitted development rights you keep.
Sources and dates
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- publicdata.landregistry.gov.uk, retrieved
- buckinghamshire.gov.uk, retrieved
- buckinghamshire.gov.uk, retrieved
- buckinghamshire.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- nomisweb.co.uk, retrieved
- nomisweb.co.uk, retrieved
- nomisweb.co.uk, retrieved
- Contains public sector information licensed under the Open Government Licence v3.0.
- Contains OS data © Crown copyright and database right 2026.
- Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
- Contains Historic England data © Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.

Tell us about your property.
We check the constraints, then send a fixed fee. Messages before 3pm get a reply the same working day.