
Drawings for a whole new home — an infill plot, a backland site or a house replaced with something better on your Three Rivers land, taken from feasibility through a full planning application with its design and access statement to the building-regs set, coordinated as one package and revised free until approved, with a free plot check first.
Three Rivers District Council granted 93% of the householder planning decisions it made in its latest published year — 6 points above the 87% England-wide householder average. Metropolitan Green Belt covers roughly three-quarters of the district, so the plan pushes growth onto brownfield and town-centre sites rather than releasing countryside, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901), Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) housing stock sets the design brief on most streets.
Class A and Class B set the thresholds — a rear dormer to 40m³ on a terrace or 50m³ on a semi or detached, and a single-storey rear extension to 3m on a terrace or 4m on a detached house — beyond which Three Rivers District Council needs a full application. Three Rivers carries at least one Article 4 direction, and conservation areas including Rickmansworth, Chorleywood Common and Moor Park remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Three Rivers is determined against an 8-week statutory target.
Rickmansworth (the historic market-town core with a Victorian and Edwardian centre and its own conservation area), Chorleywood (a Metro-land commuter village of Arts and Crafts and interwar houses around Chorleywood Common), Moor Park (a private gated estate of large interwar detached houses under an Article 4 direction), Croxley Green (mixed Victorian and interwar suburban housing gathered around the green), Abbots Langley (a village with a historic core and postwar suburban growth) and Sarratt (a rural green-belt village of historic vernacular cottages) — these are the Three Rivers pockets our drawings cover most. Heritage designations here include Rickmansworth, Chorleywood Common, Moor Park, Croxley Green, Sarratt and Abbots Langley. Three Rivers District Council weighs each proposal against the Three Rivers Core Strategy (adopted October 2011) and Development Management Policies LDD, where part of the district around Chorleywood and Rickmansworth falls within the Chilterns National Landscape (AONB), where landscape protection is at its highest. Converted flats are common through Rickmansworth and around the stations, and none of them hold householder permitted-development rights.. On roofs the borough is hipped roofs on the 1930s Metro-land semis and gabled and dual-pitch roofs on the older village cottages, over interwar and Edwardian Metro-land semi-detached and detached houses across Chorleywood, Croxley Green and Moor Park, Victorian and Edwardian terraces around Rickmansworth, postwar estate housing at Abbots Langley and South Oxhey and period vernacular cottages in the green-belt villages of Sarratt and Heronsgate.
A new-build application is a different animal from an extension: you are not adapting a house, you are proposing a building where none stands. Across Three Rivers the opportunities sit in the gaps — an infill plot between two houses, a backland site behind a garden, a large corner or driveway, or a tired bungalow worth replacing with a full house. The interwar and Edwardian Metro-land semi-detached and detached houses across Chorleywood, Croxley Green and Moor Park, Victorian and Edwardian terraces around Rickmansworth, postwar estate housing at Abbots Langley and South Oxhey and period vernacular cottages in the green-belt villages of Sarratt and Heronsgate that set the local grain also set the bar the new home is judged against, because Three Rivers District Council weighs whether the design belongs on the street.
The drawings have to make the planning case and the buildable case at once. A scaled site plan fixes the footprint, the boundaries, the parking and the amenity space; the floor plans and elevations show a house that works and reads well; and the design and access statement argues the scheme against the local plan — its scale, its massing, its relationship to the neighbours' daylight and privacy. Metropolitan Green Belt covers roughly three-quarters of the district, so the plan pushes growth onto brownfield and town-centre sites rather than releasing countryside, precisely the kind of policy a new-build design has to satisfy from the first sketch.
Where a plot sits in or beside a conservation area — Rickmansworth, Chorleywood Common, Moor Park, Croxley Green, Sarratt and Abbots Langley among Three Rivers's — the new house is judged on how it preserves or enhances the character of the place, and a contemporary or a contextual design each has to be justified. The Moor Park Article 4 direction covers the private Moor Park estate and conservation area, removing permitted-development rights so external alterations to these large interwar houses need consent, and further conservation areas such as Rickmansworth and Chorleywood Common layer additional controls. We resolve the design approach against the setting before the application is drawn.

Yes — a new dwelling always needs a full planning application to Three Rivers District Council. The design has to answer these questions before it is likely to be approved:
We take the plot from a free feasibility check through the full planning application — site plan, floor plans, elevations and design and access statement — to the building-regs and structural set, coordinating the whole thing so the house that gets permission is the same house that gets built and signed off by Three Rivers District Council.
Below is Three Rivers District Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Three Rivers grants a high share of decisions overall, with green-belt containment across most of the district and Chilterns AONB protection the recurring constraints on larger schemes. A new dwelling is a full application judged on design quality — a scheme presented with a proper site plan and design and access statement is far more likely to land than a bare set of elevations.
Source: MHCLG planning application statistics (householder decisions, England, 1 April 2025 - 31 March 2026). Compare every borough on our London approval-rate league table.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
A new-build permission is won on the argument that the plot can take another house and that the design earns its place. Three Rivers District Council's officers weigh the principle of development on the site, the scale and massing against the neighbours, the daylight and privacy impact, the parking and drainage, and the quality of the design itself. Across Rickmansworth, Chorleywood and Moor Park these are the tests that separate a plot that gets developed from one that stays a garden — and the design and access statement is where the case is made.
Part of the district around Chorleywood and Rickmansworth falls within the Chilterns National Landscape (AONB), where landscape protection is at its highest. We often recommend testing the principle first — a pre-application enquiry to Three Rivers District Council, or an outline application to fix the acceptability of a new home before the full design spend — then take the approved principle through to a detailed permission and the building-regs set, so a Three Rivers plot is de-risked before the money goes in.

We design new dwellings on the infill, backland and replacement plots across the borough. A few of the Three Rivers neighbourhoods where new-build sites come up most often:
New build drawings for a plot around Rickmansworth's the historic market-town core with a Victorian and Edwardian centre and its own conservation area — designed to sit in the street and drawn for Three Rivers District Council's full planning process.
New build drawings for a plot around Chorleywood's a Metro-land commuter village of Arts and Crafts and interwar houses around Chorleywood Common — designed to sit in the street and drawn for Three Rivers District Council's full planning process.
New build drawings for a plot around Moor Park's a private gated estate of large interwar detached houses under an Article 4 direction — designed to sit in the street and drawn for Three Rivers District Council's full planning process.
New build drawings for a plot around Croxley Green's mixed Victorian and interwar suburban housing gathered around the green — designed to sit in the street and drawn for Three Rivers District Council's full planning process.
New build drawings for a plot around Abbots Langley's a village with a historic core and postwar suburban growth — designed to sit in the street and drawn for Three Rivers District Council's full planning process.
New build drawings for a plot around Sarratt's a rural green-belt village of historic vernacular cottages — designed to sit in the street and drawn for Three Rivers District Council's full planning process.
A new dwelling is judged as a building in its own right. This is what the set has to include and what each part is judged on.
| Document | What it shows | Judged on | Stage |
|---|---|---|---|
| Site plan | Footprint, boundaries, parking and amenity space | Whether the plot can take the house | Planning |
| Plans & elevations | The house that will be built | Design quality and how it sits in the street | Planning |
| Design & access statement | The argument against the local plan | Scale, massing, daylight and character | Planning |
| Structural & regs set | Construction, drainage and structure | Buildability and compliance | Building control |
On a plot in a conservation area — such as Rickmansworth and Chorleywood Common, green belt or a flood zone — Three Rivers District Council requires further justification before a new dwelling is acceptable.
A staged route that de-risks the plot before the full design spend — the principle first, then the detail, then the build.
Send us the Three Rivers plot and what you want to build. We check Three Rivers District Council's local plan, the site's designations and the likely acceptability of a new dwelling before you commit to design.
We develop a concept and, where it de-risks the plot, test it with a pre-application or outline enquiry to Three Rivers District Council so the principle of a new home is confirmed before the detailed spend.
We produce the site plan, floor plans, elevations and design and access statement, with daylight/sunlight and drainage information where the site needs it, as a complete application.
We submit to Three Rivers District Council, negotiate the design through determination, then produce the building-regulations and structural set and revise it free until the new home is approved and buildable.
Always. There is no permitted-development route to a brand-new dwelling, so a new house — whether on an infill plot, a backland site or as a replacement — needs a full planning application to Three Rivers District Council. The application is judged on the principle of development on the plot and the quality of the design. We check the plot's realistic prospects against the Three Rivers local plan before you spend on a full scheme.
It depends less on raw size than on whether the plot meets Three Rivers District Council's standards for a new home — adequate amenity space, parking or access, privacy distances to neighbours, and a footprint that sits comfortably in the street. A garden or driveway that looks generous can still fail on overlooking or access. Our free feasibility check tests your Three Rivers plot against these before you invest in design.
A design and access statement explains and justifies the design of the new dwelling — its scale, massing, materials and how it responds to the site and the local plan — and most new-build applications in Three Rivers benefit from or require one. It is where the planning case is argued, so Three Rivers District Council's officer can see the reasoning rather than infer it from drawings. We write it to answer the specific policies your plot engages.
Outline permission fixes the principle that a new home is acceptable on the plot without committing to the full design, which can de-risk a site before heavy spend; full permission settles both principle and detail in one go. For a single dwelling in Three Rivers we often recommend a pre-application enquiry to Three Rivers District Council first, then a full application, but on a marginal plot the outline route can protect you. We advise which fits your site.
Often yes. Replacing a tired bungalow or small house with a better dwelling is a common and viable route, but it is a full planning application judged on whether the replacement is a proportionate improvement in scale and design — Three Rivers District Council will not simply wave through something much larger. On a plot near a conservation area such as Rickmansworth and Chorleywood Common the design is scrutinised more closely. We test the replacement's likely scale before designing.
We price each Three Rivers new build individually, because the plot, the design ambition and whether the site needs daylight, drainage or ecology support all vary enormously, and send a fixed, no-obligation quote within one working day. It covers the coordinated planning and building-regs set with free revisions until Three Rivers District Council approves. The structural engineer, any specialist reports and the council fee are separate. Call 020 7864 7245 to start.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.