Septic Tank & Sewage Treatment Plant (STP) Installation Pricing & Options

Transparent pricing helps property owners budget accurately. Our installations include all standard components:

Septic Tank – Standard Installation (1-3 Bedrooms) – From £5,500
Complete package with EN12566-1 certified tank, drainage field, pipework, excavation, electrical if required, and compliance certification. Suitable for ground discharge where percolation permits.

Sewage Treatment Plant – Domestic (1-6 PE) – From £7,500
Full installation of BS EN12566-3 certified STP with surface/ground discharge capability, control panel, blower, comprehensive drainage field, and full commissioning.

Larger/Commercial Installations – Custom Quote
Multi-bedroom homes or businesses receive bespoke quotations following detailed site appraisal, soil testing, and hydraulic loading calculations.

Additional cost factors may include:

• Poor percolation requiring extended drainage fields

• Mound systems for high groundwater or shallow soils

• Pumping stations for below-ground installations

• Electrical supply upgrades or long cable runs

Properties near watercourses require sewage treatment plants producing clean effluent for compliant discharge

Every quote provides itemised breakdown of costs. No work proceeds until you approve the complete price.

Frequently Asked Questions About Septic Tank & Sewage Treatment Plant (STP) Installation

🔹 Septic tank or sewage treatment plant – which do I need? Soil percolation determines suitability. Good draining ground permits septic tanks discharging to land; poor soils or surface water discharge require STPs. We test and recommend accordingly.

🔹 How long does a complete installation take? Site preparation and percolation testing: 1-2 weeks. Installation: 3-7 working days depending on system complexity and ground conditions. Full sign-off within 2 weeks of completion.

🔹 Which brands do you install? We supply market-leading manufacturers including Kingspan Klargester, Premier Tech Ecoflo, Marsh Industries, and Tricel – all certified to European standards with full UK support networks.

🔹 Do I need Building Regulations approval? Yes – all new installations require Part H Building Control approval. We handle applications, percolation tests, and inspections, providing certification on completion.

🔹 What maintenance do STPs require? Annual service of air blowers (£150-£250), desludging every 1-2 years, and power supply checks. Comprehensive service contracts available with rapid-response breakdown cover.

🔹 Can you upgrade existing septic tanks to treatment plants? Yes – Mantair conversion units fit inside existing tanks, or complete replacement systems where capacity proves inadequate. Perfect for general binding rules compliance upgrades.

Why Choose Fastfix Drainage And Plumbing For Septic Work

Choosing the right contractor matters; septic systems are specialist installations and repairs that must be done properly to protect your property, health, and the environment. Here’s why homeowners and property managers rely on Fastfix:

• Local expertise: Our engineers know local ground conditions, common fault patterns, and the regulatory landscape, adapting solutions to the realities of your site.
• Fully qualified team: We use certified technicians experienced in drainage, wastewater treatment, and confined-space safety. All work is carried out to industry standards and relevant British Standards.
• Transparent pricing: You’ll get clear, itemised quotations with no hidden extras. For routine tasks, we offer fixed-price emptying and maintenance packages to make budgeting straightforward.
• Fast response: Septic problems don’t wait. We provide rapid emergency call-outs and prioritise containment measures to minimise property disruption while planning a permanent fix.
• Environment-first approach: We follow Environment Agency guidance on wastewater management and dispose of waste through licensed carriers, protecting groundwater and local waterways.
• Evidence-based reporting: Our surveys and installation handovers include full documentation, test results, as-built drawings, and maintenance advice, useful for new owners and compliance checks.
• Cost-saving tips: We advise on regular inspections, septic tank maintenance schedules, and usage habits to significantly reduce long-term expenses and prevent expensive repairs.

We combine technical know-how with friendly customer service: you’ll always speak to a technician who understands your system and can explain solutions in plain English.

Contact us for more Septic Tank & Off Mains Drainage advice, or get a FREE drainage & plumbing quote