DOWNLAND STUDIO · WORTHING & WEST SUSSEX

Project Planning Tools

Every great project starts with understanding what’s possible.

Explore our free project planning tools to estimate design fees, consider planning feasibility and build an early picture of project costs. Whether you’re thinking about an extension, loft conversion, garden improvement or HMO, start with the questions that matter to you.

EXPLORE THE TOOLS DISCUSS YOUR PROJECT

01 · DESIGN FEES & PROJECT COSTS

Understand the numbers.

Explore professional design fees and indicative construction budgets. Each tool focuses on a different part of the project, so you can build a more useful early picture.

01

Architectural Design Fees Calculator

Build an indicative fee based on your property, proposed work and the service stages you need. The breakdown helps show what is included and where other project costs may sit.

CALCULATE DESIGN FEES
02

House Extension Cost Calculator

Explore an early construction budget for an extension, with project details and site considerations shaping the estimate.

ESTIMATE EXTENSION COSTS
03

Loft Conversion Cost Calculator

Consider a likely build budget for a loft conversion alongside the design and technical work your project may need.

ESTIMATE LOFT COSTS

02 · PLANNING & FEASIBILITY

Check the likely route.

A few early checks can help you understand what may need to be considered before a design or application moves forward.

04

Planning Permission Checker

Answer questions about your home and proposed work to see whether Permitted Development may be relevant, whether further checks are recommended and when planning permission is likely to be needed.

CHECK YOUR PROJECT
Use it as a starting pointThe checker provides an initial indication, not a planning decision or a substitute for checking your property’s history, constraints and the details of your proposal. A Lawful Development Certificate is a separate formal application.

03 · GARDENS & OUTDOOR SPACES

Plan beyond the back door.

Explore an early budget for garden works, then consider whether a separate garden room could make the space work harder.

05

Landscaping Cost Calculator

Build an initial garden budget from the areas and features you’re considering, with access and site conditions shown as part of the estimate.

PLAN GARDEN COSTS
06

Garden Room Cost Calculator

Explore typical prices for different garden room sizes, styles and optional extras, using the calculator on the Landscape & Garden Design page.

PLAN A GARDEN ROOM

04 · HMO & PROPERTY INVESTMENT

Explore an HMO project.

These tools help landlords and property investors consider a property’s potential and the architectural design fees involved.

07

HMO Feasibility Checker

Explore initial questions around property type, accommodation, occupancy and the planning, licensing and building considerations that may apply.

CHECK HMO POTENTIAL
08

HMO Design Fees Calculator

Build an indicative architectural fee for HMO measured survey, design and technical drawing stages based on the project information you provide.

EXPLORE HMO FEES
HMO results are indicativePlanning use, licensing, fire safety and building requirements are separate matters. Confirm the position for the property and proposed occupancy with the relevant council and appointed specialists.

A USEFUL FIRST STEP

How to read your result.

Our calculators are designed to help you explore options and prepare better questions, not replace a project-specific review.

Build estimates and fee indications depend on the answers and assumptions entered. They are guidance rather than a contractor quotation or a formal professional proposal. Planning and feasibility tools cannot guarantee an approval or outcome. Once the project scope and property are understood, Downland Studio can confirm what is appropriate and provide a tailored proposal.

HAVE A PROJECT IN MIND?

Turn your early ideas into a clear next step.

If a calculator has raised a question or helped you understand what you need, we’d be happy to discuss your home and the right place to begin.

DISCUSS YOUR PROJECT