House Extension Costs in 2025: A Practical Dorset Homeowner Guide

Nov 10

2 min read

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Introduction

Extending is often cheaper and easier than moving, if you plan well. This guide breaks down what drives extension costs in Dorset and how to budget realistically without sacrificing quality.

What Drives the Cost the Most

Size and Shape

Cost scales with footprint and complexity. Simple rectangular additions are more economical than heavily stepped or irregular plans.

Ground Conditions and Foundations

Soil quality, drainage and access can affect excavation, concrete volumes and programme. We assess early to avoid surprises.

Structure and Openings

Large steel openings for open-plan kitchens increase structure costs but transform how a space feels. We price these clearly.

Specification and Services

Windows, doors, kitchens, bathrooms, heating and electrics vary widely. Prioritise high-touch surfaces and energy efficiency for best long-term value.

Smart Budget Planning

Prioritise layout first. A great plan beats expensive finishes.
Bundle works. Doing kitchen, electrics and flooring together reduces re-work.
Value engineer with us. We’ll propose alternatives that protect look and performance.
Keep a contingency. A sensible reserve helps handle unforeseen conditions calmly.

Timelines You Can Expect

Allow time for design and any permissions, then typical on-site durations depend on size and complexity. We sequence trades to minimise disruption and keep neighbours informed.