Budget band
Side Return
Utilizing side alley space
Typical budget
£30,000 - £50,000
- Kitchen expansion
- Roof lantern option
- Bi-fold doors
- New flooring
- Complete finish
Best when you want utilizing side alley space without losing control of scope.
Price GuideMarylebone W1U
House Extension Prices in Marylebone
Extend your home with additional living space. Budget realistically with a published range from £30,000 to £180,000, backed by clearer scope notes, delivery context, and direct office guidance before you commit.
From £30,000Typical programme 8-16 weeksNo hidden fee positioning
Transparent scope
Every quote is broken down clearly so you can compare tiers, finishes, and allowances without guesswork.
Local delivery context
We price around Marylebone access, property type, and programme constraints rather than using a generic London average.
Office-first support
You can speak to the office for budgeting, specification, and scheduling before booking a site visit.
Cost planning
House Extension price guide for Marylebone
Use these ranges to shortlist the right level of specification, then speak to the office for a more precise scope review based on your property, access, and finish standard.
Most requested range
Single Storey Rear
Ground floor rear extension
Typical budget
£50,000 - £90,000
- Open-plan living
- Large glazing
- Underfloor heating
- Kitchen/dining
- Garden access
Best when you want ground floor rear extension without losing control of scope.
Budget band
Double Storey
Two-storey extension
Typical budget
£90,000 - £180,000
- Additional bedrooms
- New bathroom
- Maximum space
- Future-proof design
- Premium finish
Best when you want two-storey extension without losing control of scope.
Cost drivers
What moves your house extension budget in Marylebone?
The published range is shaped by specification, property condition, and how much preparatory or structural work is needed before finishes can start.
Price signal
£30,000 to £180,000
This spread reflects entry, mid, and premium delivery tiers rather than an artificially compressed headline figure.
1
Extension size
This is one of the first items we review when turning a broad guide price into a fixed quotation for your property.
2
Construction type
This is one of the first items we review when turning a broad guide price into a fixed quotation for your property.
3
Foundation requirements
This is one of the first items we review when turning a broad guide price into a fixed quotation for your property.
4
Glazing specification
This is one of the first items we review when turning a broad guide price into a fixed quotation for your property.
5
Interior finish
This is one of the first items we review when turning a broad guide price into a fixed quotation for your property.
Included in the quote
What is normally covered in our house extension pricing
Planning drawings
Building regulations
Groundworks
Construction
Roofing
First-fix services
Typical programme
8-16 weeks
Final sequencing is confirmed once the survey and scope are agreed.
Warranty cover
10 years structural guarantee
Installation and structural protections are set out clearly in your quote pack.
Quoted with
Labour, materials, management
Our published ranges are designed to reflect real delivery, not stripped-back headline numbers.
Local next step
Need the area view before deciding?
Review the main Marylebone hub to compare services, nearby coverage, and broader renovation context before requesting a fixed price.
View Marylebone coverage pageHouse Extension Pricing FAQs - Marylebone
Find answers to common questions about our services.
House Extension in Marylebone typically ranges from £30,000 to £180,000. The exact price depends on: Extension size, Construction type, Foundation requirements. HAMPSTEAD RENOVATIONS provides free, no-obligation quotes for Marylebone properties.
Our house extension price includes: Planning drawings, Building regulations, Groundworks, Construction, Roofing, First-fix services. There are no hidden extras - we believe in complete transparency. The quote you receive is the price you pay.
House Extension typically takes 8-16 weeks. The exact duration depends on project complexity and any specific requirements for Marylebone properties. We provide detailed timelines with every quote.
HAMPSTEAD RENOVATIONS provides 10 years structural guarantee. We stand behind our work with comprehensive guarantees that give you complete peace of mind.
HAMPSTEAD RENOVATIONS offers transparent pricing with no hidden fees, local expertise in Marylebone properties, comprehensive warranties, and published review evidence across London. Our current aggregate rating is 4.9 from 183 published reviews.
More price routes
Compare other service budgets in Marylebone
These guides use the same transparent structure, so you can compare scope and budget before building a broader project brief.
Marylebone
Full House Renovation
Complete property renovation including structural work, electrical, plumbing, and finishes.
From £80,000
Marylebone
Kitchen Renovation
Complete kitchen transformation from design to installation.
From £15,000
Marylebone
Bathroom Renovation
Complete bathroom design and installation services.
From £8,000
Marylebone
Loft Conversion
Transform your loft into valuable living space.
From £30,000
Marylebone
Basement Conversion
Create additional living space with a basement conversion.
From £50,000
Marylebone
Electrical Rewire
Complete electrical rewiring for safety and modern standards.
From £3,000
Speak to the office
Get a sharper house extension quote for Marylebone
Call the office for budgeting and programme guidance, or send your brief for a fuller written quotation. We will explain what is included, what can move cost, and which tier best fits your property.
Typical start point
£30,000
Published rating
4.9 / 5
Across 183 published reviews.
Best first call
Office for budgeting, mobile for quick response